Today's Message Index:
----------------------
1. 12:39 AM - Re: Bernoilli, His Equation, Air Moving in Pipes and Flight (Jan Mevis)
2. 05:50 AM - Air start issue (Mozam)
3. 06:06 AM - Re: Air start issue (Genzlinger, Reade)
4. 07:09 AM - Re: Air start issue (Roger Kemp)
5. 09:17 AM - yak18T project (Joe Howse)
6. 09:59 AM - Re: Air start issue (Herb Coussons)
7. 10:00 AM - Flap storage (John Graham)
8. 10:27 AM - Re: yak18T project (Jim)
9. 10:41 AM - M14P Air Compressor Wanted (ONTHEGOSA@aol.com)
10. 10:45 AM - Re: Flap storage (cjpilot710@aol.com)
11. 10:47 AM - Re: Air start issue (Genzlinger, Reade)
12. 10:58 AM - Re: M14P Air Compressor Wanted (Sarah Tobin)
13. 11:11 AM - Re: Air start issue (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
14. 11:17 AM - Re: M14P Air Compressor Wanted (Larry Pine)
15. 11:34 AM - Re: Flap storage (Hans Oortman 1)
16. 11:53 AM - Re: Re: Bernoilli, His Equation, Air Moving in Pipes and Flight (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
17. 12:21 PM - 52 TW Tailwheel (Ira Saligman)
18. 12:39 PM - Re: Flap storage ()
19. 04:22 PM - Re: Bernoilli, His Equation, Air Moving in Pipes and Flight (Scooter)
20. 04:30 PM - Re: 52 TW Tailwheel (Mozam)
21. 05:34 PM - Re: Re: Bernoilli, His Equation, Air Moving in Pipes and Flight (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
22. 06:38 PM - Re: Bernoilli, His Equation, Air Moving in Pipes and Flight (Craig Winkelmann, CFI)
23. 07:36 PM - Re: 52 TW Tailwheel (Roger Kemp)
24. 07:43 PM - Re: Re: Bernoilli, His Equation, Air Moving in Pipes and Flight (viperdoc)
25. 08:31 PM - Re: yak18T project (Chanock Richka)
Message 1
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| Subject: | Bernoilli, His Equation, Air Moving in Pipes and Flight |
Anyway, aerodynamics is a very complex science, and what pilots usually
(have to) know about it, is quite limited. To calculate aerodynamic forces,
you also need the theorem of Blasius and its modern variants for subsonic
speeds. Lots of complex analysis and contour integrals ...
Jan
YK50 RA2005K
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Brian Lloyd
Sent: zaterdag 22 september 2007 7:04
Subject: Re: Yak-List: Bernoilli, His Equation, Air Moving in Pipes and
Flight
On Sep 20, 2007, at 8:45 PM, Bitterlich, Mark G CIV Det Cherry Point,
MALS-14 64E wrote:
> One thing though... For Bernoulli's Principle to apply, the fluid is
> assumed to have the same density everywhere (it is "incompressible"
> like
> water.
>
> Does the compressed air in our systems meet this definition? Yes, no?
No. We are clearly dealing with a compressible fluid as the pressure
on either side of the restriction is different.
We *were* talking about a pipe with an unintended restriction that
causes a large pressure drop between the storage tank and the rest of
the system.
--
Brian Lloyd 3191 Western Drive
brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
Antoine de Saint-Exupry
PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C
Message 2
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My -52TW has both air and electric start. Recently the air start is acting up.
When the engine is hot (higher compression than when cold) it can barely, if
at all, get the engine to rotate.
It often hangs up and I can hear the air just hissing out while the prop struggles
to move. Sometimes I can "bump" it to get the prop past the sticking point.
It was working fine and all other air systems are still working fine.
It "appears" as though the air distributer timing has slipped. Is this possible?
Thank goodness for the electric start, which can spin the engine up to idle speed.
Thanks,
Steve Dalton
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=136068#136068
Message 3
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Steve:
Had similar situation with the Wilga. First we replaced several of the
air injectors that were sticking. Second we had to replace the "spider"
or air distributer - lots of moisture damage (btw - Mort will probably
never do that again). Third we removed the step down valve which has
improved starting 100%. This item is not an issue with the Yaks. The
alignment of the brass plate in the air distributer is critical - I
would check with Mort on that one. Otherwise I would look for a stuck
air injector.
Reade Genzlinger
Cairnwood Cooperative Corporation
mailto:readeg@cairnwood.com
215.914.0370
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Mozam
Sent: Monday, September 24, 2007 6:48 AM
Subject: Yak-List: Air start issue
My -52TW has both air and electric start. Recently the air start is
acting up. When the engine is hot (higher compression than when cold)
it can barely, if at all, get the engine to rotate.
It often hangs up and I can hear the air just hissing out while the prop
struggles to move. Sometimes I can "bump" it to get the prop past the
sticking point.
It was working fine and all other air systems are still working fine.
It "appears" as though the air distributer timing has slipped. Is this
possible?
Thank goodness for the electric start, which can spin the engine up to
idle speed.
Thanks,
Steve Dalton
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=136068#136068
Message 4
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Steve,
Is that hissing at your left foot? Most likely you have a problem with the
seals in your air start valve. Could be the solenoid. I went through this
about a month ago. It is in one hell of a place to get to. It is on the left
side of the interior firewall. The good news is that the new CJ air start
valves are a duplicate of the RU ones. It is a straight swap. The pain in
the ass that it is because of the placement. The Chinese put theirs on the
firewall with the engine not behind it! Doug Sapp has them is stock now. I
have two shot ones on the shelf now. One recently rebuilt and the other the
original that started the problem.
Doc
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Mozam
Sent: Monday, September 24, 2007 7:48 AM
Subject: Yak-List: Air start issue
My -52TW has both air and electric start. Recently the air start is acting
up. When the engine is hot (higher compression than when cold) it can
barely, if at all, get the engine to rotate.
It often hangs up and I can hear the air just hissing out while the prop
struggles to move. Sometimes I can "bump" it to get the prop past the
sticking point.
It was working fine and all other air systems are still working fine.
It "appears" as though the air distributer timing has slipped. Is this
possible?
Thank goodness for the electric start, which can spin the engine up to idle
speed.
Thanks,
Steve Dalton
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=136068#136068
Message 5
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yak18T project for sale, any interest?
Joe for details
Message 6
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| Subject: | Re: Air start issue |
I had the same issue with my Wilga - and after cleaning it is
tolerable but not great. I thought about removing the reducer, but
left it. How long has yours been off? Is there any issue you can
think of or have had with the step down valve off? Seems like the
best solution.
Herb
On Sep 24, 2007, at 8:03 AM, Genzlinger, Reade wrote:
> <ReadeG@Cairnwood.com>
>
> Steve:
>
> Had similar situation with the Wilga. First we replaced several of
> the
> air injectors that were sticking. Second we had to replace the
> "spider"
> or air distributer - lots of moisture damage (btw - Mort will probably
> never do that again). Third we removed the step down valve which has
> improved starting 100%. This item is not an issue with the Yaks. The
> alignment of the brass plate in the air distributer is critical - I
> would check with Mort on that one. Otherwise I would look for a stuck
> air injector.
>
> Reade Genzlinger
> Cairnwood Cooperative Corporation
> mailto:readeg@cairnwood.com
> 215.914.0370
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Mozam
> Sent: Monday, September 24, 2007 6:48 AM
> To: yak-list@matronics.com
> Subject: Yak-List: Air start issue
>
>
> My -52TW has both air and electric start. Recently the air start is
> acting up. When the engine is hot (higher compression than when cold)
> it can barely, if at all, get the engine to rotate.
>
> It often hangs up and I can hear the air just hissing out while the
> prop
> struggles to move. Sometimes I can "bump" it to get the prop past the
> sticking point.
>
> It was working fine and all other air systems are still working fine.
> It "appears" as though the air distributer timing has slipped. Is
> this
> possible?
>
> Thank goodness for the electric start, which can spin the engine up to
> idle speed.
>
> Thanks,
> Steve Dalton
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=136068#136068
>
>
Message 7
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Hello fellow fliers! Quick questions as I continue to
learn about my Yak-52. When done flying, is it better
to leave the FLAP handle in the full forward position
or in the neutral position? Or does it matter one way
or the other? Thanks!
Thanks,
John P. Graham
CubFlyer1940@Yahoo.com
Cell phone (847) 641-1330
Catch up on fall's hot new shows on Yahoo! TV. Watch previews, get listings, and
more!
Message 8
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| Subject: | Re: yak18T project |
Joe
What Kind of a project will it be, let me know and if you have any
Pictures.
Jim selby
----- Original Message -----
From: Joe Howse
To: yak-list@matronics.com
Sent: Monday, September 24, 2007 9:14 AM
Subject: Yak-List: yak18T project
yak18T project for sale, any interest?
Joe for details
Message 9
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| Subject: | M14P Air Compressor Wanted |
Does anyone have a air compressor for the M14P engine they would like to
part with??
Scott
602-705-4413
Message 10
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| Subject: | Re: Flap storage |
In a message dated 9/24/2007 1:02:21 P.M. Eastern Daylight Time,
cubflyer1940@yahoo.com writes:
John,
I would and teach to put the handle back in neutral. Operationally system
wise it wouldn't make much difference, if you don't you are simply
pressurizing the up side of the flap actuator. If you than select the flaps down,
you
will have to go passed neutral, to the down side. You could mess up and you
could accidentally stop in the neutral position and not get any flaps at all.
Usually it is after landing that the flap handle is moved to the up
position. Try using this technic. After landing AND clear of the runway, put
your
hand on the flap handle. Confirm that you do have the flap handle, by looking
at it. Move the handle to the up position and leave your hand on the handle
until the flaps are up. Than move the handle to neutral.
Jim "Pappy" Goolsby
--> Yak-List message posted by: John Graham <cubflyer1940@yahoo.com>
Hello fellow fliers! Quick questions as I continue to
learn about my Yak-52. When done flying, is it better
to leave the FLAP handle in the full forward position
or in the neutral position? Or does it matter one way
or the other? Thanks!
Thanks,
John P. Graham
CubFlyer1940@Yahoo.com
Cell phone (847) 641-1330
Catch up on fall's hot new shows on Yahoo! TV. Watch previews, get listings,
and more!
Message 11
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Herb:
A bunch of Wilga owners have done this - we just took the innards of the
reducer out to avoid re-plumbing things and it works beautifully. Been
doing it this way for 1 year. I think the reducer was used to preserve
air for multiple start attempts since the storage bottles are so small.
Ours, if primed properly starts very easily and we've had no issues with
supply.
Reade Genzlinger
Cairnwood Cooperative Corporation
mailto:readeg@cairnwood.com
215.914.0370
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Herb Coussons
Sent: Monday, September 24, 2007 10:58 AM
Subject: Re: Yak-List: Air start issue
I had the same issue with my Wilga - and after cleaning it is
tolerable but not great. I thought about removing the reducer, but
left it. How long has yours been off? Is there any issue you can
think of or have had with the step down valve off? Seems like the
best solution.
Herb
On Sep 24, 2007, at 8:03 AM, Genzlinger, Reade wrote:
> <ReadeG@Cairnwood.com>
>
> Steve:
>
> Had similar situation with the Wilga. First we replaced several of
> the
> air injectors that were sticking. Second we had to replace the
> "spider"
> or air distributer - lots of moisture damage (btw - Mort will probably
> never do that again). Third we removed the step down valve which has
> improved starting 100%. This item is not an issue with the Yaks. The
> alignment of the brass plate in the air distributer is critical - I
> would check with Mort on that one. Otherwise I would look for a stuck
> air injector.
>
> Reade Genzlinger
> Cairnwood Cooperative Corporation
> mailto:readeg@cairnwood.com
> 215.914.0370
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Mozam
> Sent: Monday, September 24, 2007 6:48 AM
> To: yak-list@matronics.com
> Subject: Yak-List: Air start issue
>
>
> My -52TW has both air and electric start. Recently the air start is
> acting up. When the engine is hot (higher compression than when cold)
> it can barely, if at all, get the engine to rotate.
>
> It often hangs up and I can hear the air just hissing out while the
> prop
> struggles to move. Sometimes I can "bump" it to get the prop past the
> sticking point.
>
> It was working fine and all other air systems are still working fine.
> It "appears" as though the air distributer timing has slipped. Is
> this
> possible?
>
> Thank goodness for the electric start, which can spin the engine up to
> idle speed.
>
> Thanks,
> Steve Dalton
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=136068#136068
>
>
Message 12
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| Subject: | Re: M14P Air Compressor Wanted |
Sure, you can have the one in my airplane that is pissing me off and doesn't work,
sold "as is" and you have to remove it, haha!
Smash
ONTHEGOSA@aol.com wrote:
Does anyone have a air compressor for the M14P engine they would like
to part with??
Scott
602-705-4413
---------------------------------
Se69" target="_blank">Make AOL Your Homepage.
---------------------------------
Don't let your dream ride pass you by. Make it a reality with Yahoo! Autos.
Message 13
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For the Russian made air start valves, be aware that there are two
types, those with the external manual lever and those without. The
bottom half of the assy (where the solenoid is) can be swapped with a
new valve to retain this capability if desired.
Mark Bitterlich
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Roger Kemp
Sent: Monday, September 24, 2007 10:06
Subject: RE: Yak-List: Air start issue
Steve,
Is that hissing at your left foot? Most likely you have a problem with
the seals in your air start valve. Could be the solenoid. I went through
this about a month ago. It is in one hell of a place to get to. It is on
the left side of the interior firewall. The good news is that the new CJ
air start valves are a duplicate of the RU ones. It is a straight swap.
The pain in the ass that it is because of the placement. The Chinese put
theirs on the firewall with the engine not behind it! Doug Sapp has them
is stock now. I have two shot ones on the shelf now. One recently
rebuilt and the other the original that started the problem.
Doc
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Mozam
Sent: Monday, September 24, 2007 7:48 AM
Subject: Yak-List: Air start issue
My -52TW has both air and electric start. Recently the air start is
acting up. When the engine is hot (higher compression than when cold)
it can barely, if at all, get the engine to rotate.
It often hangs up and I can hear the air just hissing out while the prop
struggles to move. Sometimes I can "bump" it to get the prop past the
sticking point.
It was working fine and all other air systems are still working fine.
It "appears" as though the air distributer timing has slipped. Is this
possible?
Thank goodness for the electric start, which can spin the engine up to
idle speed.
Thanks,
Steve Dalton
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=136068#136068
Message 14
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| Subject: | Re: M14P Air Compressor Wanted |
Are you going to do the conversion at FFZ or DVT?
ONTHEGOSA@aol.com wrote: Does anyone have a air compressor for the M14P
engine they would like to part with??
Scott
602-705-4413
---------------------------------
Se69" target="_blank">Make AOL Your Homepage.
Larry Pine
---------------------------------
Looking for a deal? Find great prices on flights and hotels with Yahoo! FareChase.
Message 15
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John. Ref Pappy's comment:
Especially the bold part "by looking at it" is important..I know.I found out
the hard way.
Hans
_____
Van: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] Namens cjpilot710@aol.com
Verzonden: maandag 24 september 2007 19:45
Aan: yak-list@matronics.com
Onderwerp: Re: Yak-List: Flap storage
In a message dated 9/24/2007 1:02:21 P.M. Eastern Daylight Time,
cubflyer1940@yahoo.com writes:
John,
I would and teach to put the handle back in neutral. Operationally system
wise it wouldn't make much difference, if you don't you are simply
pressurizing the up side of the flap actuator. If you than select the flaps
down, you will have to go passed neutral, to the down side. You could mess
up and you could accidentally stop in the neutral position and not get any
flaps at all.
Usually it is after landing that the flap handle is moved to the up
position. Try using this technic. After landing AND clear of the runway,
put your hand on the flap handle. Confirm that you do have the flap handle,
by looking at it. Move the handle to the up position and leave your hand on
the handle until the flaps are up. Than move the handle to neutral.
Jim "Pappy" Goolsby
Hello fellow fliers! Quick questions as I continue to
learn about my Yak-52. When done flying, is it better
to leave the FLAP handle in the full forward position
or in the neutral position? Or does it matter one way
or the other? Thanks!
Thanks,
John P. Graham
CubFlyer1940@Yahoo.com
Cell phone (847) 641-1330
Catch up on fall's hot new shows on Yahoo! TV. Watch previews, get listings,
and es Day --> - NEW MATRONICS WEB FORUMS -
bsp; --> =====================
_____
See what's new="_blank">Make AOL Your Homepage.
Message 16
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| Subject: | Re: Bernoilli, His Equation, Air Moving in Pipes and Flight |
The pressure goes UP in the main system because when you shut the valve
to the tank on a 50, the compressor is still creating more air pressure,
and will continue to build pressure until the pop-off valve is released.
Thus if you shut off the tank at 40, the gage will continue to show the
pressure increase until the valve pops and releases as per normal
operation.
The 50 DOES also charge the emergency bottle as well as the main bottle,
unlike the 52.
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Tim Gagnon
Sent: Sunday, September 23, 2007 22:30
Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight
Craig Winkelmann, CFI wrote:
> Tim:
>
> Is there any possible way for there to be a leak from the main system
to the backup/emergency system?? Why would your pressure go UP when you
shut off the main system? What is your emergency air pressure when you
start, fly, move gear, etc?
>
> Craig
Steady at 60. The needle does not move at any time....
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=136017#136017
Message 17
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Has anyone shortened the bar holding the tailwheel on the 52TW. At the
current length, while on deck, the aircraft sits at an attitude well into
the flying envelope rather than at stall.
Ira Saligman
o 610 940 0420
c 610 324 5500
f 215 243 7699
isaligman@Saligman.com
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Yak-List Digest
Server
Sent: Sunday, September 23, 2007 2:59 AM
Subject: Yak-List Digest: 11 Msgs - 09/22/07
*
=================================================
Online Versions of Today's List Digest Archive
=================================================
Today's complete Yak-List Digest can also be found in either of the
two Web Links listed below. The .html file includes the Digest formatted
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such as Notepad or with a web browser.
HTML Version:
http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter
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===============================================
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----------------------------------------------------------
Yak-List Digest Archive
---
Total Messages Posted Sat 09/22/07: 11
----------------------------------------------------------
Today's Message Index:
----------------------
1. 06:56 AM - Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight (Ernie)
2. 11:43 AM - Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight (Tim Gagnon)
3. 11:43 AM - Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight (Tim Gagnon)
4. 11:54 AM - Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight (Tim Gagnon)
5. 11:57 AM - Can someone GIVE me 850K (Tim Gagnon)
6. 12:15 PM - Re: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight (Yak Pilot)
7. 12:40 PM - Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight (Tim Gagnon)
8. 12:46 PM - Back to Tim's problem (was: Bernoilli, His Equation, Air
Moving in Pipes and Flight) (Brian Lloyd)
9. 02:37 PM - Re: Back to Tim's problem (was: Bernoilli, His Equation,
Air Mov (Scooter)
10. 04:55 PM - Re: Back to Tim's problem (was: Bernoilli, His Equation,
Air Moving in Pipes and Flight) (Terry Lewis)
11. 05:06 PM - Re: Back to Tim's problem (was: Bernoilli, His Equation,
Air Moving in Pipes and Flight) (Brian Lloyd)
________________________________ Message 1
_____________________________________
Time: 06:56:30 AM PST US
Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight
From: "Ernie" <erniel29@gmail.com>
Magnus has no effect on the burrple destrofunkenspicthen, when bernouli
tickles his testicular nipplefricker. Now on the other hand, if you
diassemble the pooter evector during a combined molecular fusion
butterjamtoastgotshitonmyshirt event, then you may ripp the goddam wings off
of the plane.
Ernie
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135747#135747
________________________________ Message 2
_____________________________________
Time: 11:43:30 AM PST US
Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight
From: "Tim Gagnon" <NiftyYak50@fuse.net>
Ernie wrote:
> Magnus has no effect on the burrple destrofunkenspicthen, when
> bernouli tickles
his testicular nipplefricker. Now on the other hand, if you diassemble the
pooter evector during a combined molecular fusion
butterjamtoastgotshitonmyshirt event, then you may ripp the goddam wings off
of the plane.
>
> Ernie
Exactly.....
(The new spell checker went nuts on this)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135779#135779
________________________________ Message 3
_____________________________________
Time: 11:43:34 AM PST US
Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight
From: "Tim Gagnon" <NiftyYak50@fuse.net>
Ernie wrote:
> Magnus has no effect on the burrple destrofunkenspicthen, when
> bernouli tickles
his testicular nipplefricker. Now on the other hand, if you diassemble the
pooter evector during a combined molecular fusion
butterjamtoastgotshitonmyshirt event, then you may ripp the goddam wings off
of the plane.
>
> Ernie
Exactly.....
(The new spell checker went nuts on this)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135778#135778
________________________________ Message 4
_____________________________________
Time: 11:54:16 AM PST US
Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight
From: "Tim Gagnon" <NiftyYak50@fuse.net>
I spoke to the mechanic who did the work on my airplane. Before anyone jumps
on him for "shoulda known better", the guy does amazing work and the use of
the a smaller diameter line was talked about. His lack of experience with
Yaks and my...hmmm...lack of thorough knowledge lead us towards using the
fill line from the fill port instead of running a new line from the new
bottle (behind my seat). So, we will replace the line with one of original
diameter. We will also check for leaks....
Sooo......a few observations from todays flight and something that may add a
wrench to the works...OR....turn a light bulb on for someone.
Go to the airplane to fly this morning. Gauge reads about 40. Turn on the
main valve, pressure drops to about 20. Hmmmm...small leak somewhere
downstream of the bottle? (The airplane has been sitting for about a week or
so) She starts perfectly after a few blades, I let her warm up to 120c+ and
when I push the lever forward, I have about 40 ATM. This is after about 6 or
7 minutes from start to throttle up for take off. Making good pressure. Lift
off, gear handle up, that big pressure drop (20+ atm) but gears comes home
nicely with a reassuring thump. Pressure rebuilds to >55 ATM after somewhere
between 5-10 minutes of flying. Go flip around a bit, come back into the
pattern, gear down off the perch, big pressure drop (same pressure drop) and
gear thumps nicely. Land with about 25 atm in the airplane. Run up, pressure
builds back up to 40 or so, but did something new this time....hopefully not
unsafe.
Brakes on, run up to 70% for about a minute, pressure builds to about 40,
then I SHUT OFF (engine still running) the main valve and the pressure
builds to about 55 ATM and I shut her down.
I have some thoughts but want to verify mine with yours....you guys are way
smarter than I am.
I am glad this thread has generated some healthy, yet calm, discussion. I
have learned much...
One more question. What are you guys normal oil temps in cruise at a crusie
power setting.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135781#135781
________________________________ Message 5
_____________________________________
Time: 11:57:59 AM PST US
Subject: Yak-List: Can someone GIVE me 850K
From: "Tim Gagnon" <NiftyYak50@fuse.net>
I want this airplane!
http://www.courtesyaircraft.com/Lavochkin%20LA-9%20Spec.htm
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135782#135782
________________________________ Message 6
_____________________________________
Time: 12:15:10 PM PST US
From: Yak Pilot <yakplt@yahoo.com>
Subject: Re: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight
I am starting to wonder whether you might just have a bad gage. Checked for
that yet?
Mark
Tim Gagnon <NiftyYak50@fuse.net> wrote:
I spoke to the mechanic who did the work on my airplane. Before anyone jumps
on him for "shoulda known better", the guy does amazing work and the use of
the a smaller diameter line was talked about. His lack of experience with
Yaks and my...hmmm...lack of thorough knowledge lead us towards using the
fill line from the fill port instead of running a new line from the new
bottle (behind my seat). So, we will replace the line with one of original
diameter. We will also check for leaks....
Sooo......a few observations from todays flight and something that may add a
wrench to the works...OR....turn a light bulb on for someone.
Go to the airplane to fly this morning. Gauge reads about 40. Turn on the
main valve, pressure drops to about 20. Hmmmm...small leak somewhere
downstream of the bottle? (The airplane has been sitting for about a week or
so) She starts perfectly after a few blades, I let her warm up to 120c+ and
when I push the lever forward, I have about 40 ATM. This is after about 6 or
7 minutes from start to throttle up for take off. Making good pressure. Lift
off, gear handle up, that big pressure drop (20+ atm) but gears comes home
nicely with a reassuring thump. Pressure rebuilds to >55 ATM after somewhere
between 5-10 minutes of flying. Go flip around a bit, come back into the
pattern, gear down off the perch, big pressure drop (same pressure drop) and
gear thumps nicely. Land with about 25 atm in the airplane. Run up, pressure
builds back up to 40 or so, but did something new this time....hopefully not
unsafe.
Brakes on, run up to 70% for about a minute, pressure builds to about 40,
then I SHUT OFF (engine still running) the main valve and the pressure
builds to about 55 ATM and I shut her down.
I have some thoughts but want to verify mine with yours....you guys are way
smarter than I am.
I am glad this thread has generated some healthy, yet calm, discussion. I
have learned much...
One more question. What are you guys normal oil temps in cruise at a crusie
power setting.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135781#135781
________________________________ Message 7
_____________________________________
Time: 12:40:25 PM PST US
Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight
From: "Tim Gagnon" <NiftyYak50@fuse.net>
Nope...but I will add that to the list of things to check!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135791#135791
________________________________ Message 8
_____________________________________
Time: 12:46:14 PM PST US
From: Brian Lloyd <brian-1927@lloyd.com>
Subject: Yak-List: Back to Tim's problem (was: Bernoilli, His Equation, Air
Moving in Pipes and Flight)
On Sep 22, 2007, at 11:53 AM, Tim Gagnon wrote:
> pattern, gear down off the perch, big pressure drop (same pressure
> drop) and gear thumps nicely. Land with about 25 atm in the
> airplane. Run up, pressure builds back up to 40 or so, but did
> something new this time....hopefully not unsafe.
>
> Brakes on, run up to 70% for about a minute, pressure builds to
> about 40, then I SHUT OFF (engine still running) the main valve and
> the pressure builds to about 55 ATM and I shut her down.
One comment. Everything is working but you are getting a big pressure
change with gear actuation and a rapid pressure recovery. If you had
a leak, the pressure would keep going down but your pressure comes
right back up again. That says to me, no leak. The big changes in
pressure also tell me, small volume. Check your tank. Something is
taking up a lot of space in there and leaving you with very little
system volume.
--
Brian Lloyd 3191 Western Drive
brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
Antoine de Saint-Exupry
PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C
________________________________ Message 9
_____________________________________
Time: 02:37:48 PM PST US
Subject: Yak-List: Re: Back to Tim's problem (was: Bernoilli, His Equation,
Air Mov
From: "Scooter" <yakk52@verizon.net>
I can't recall how the Yak-50 air system is set up... If this were a 52 I'd
almost think (going under Brian's theory) that the main and reserve bottles
were swapped. This would account for a big pressure drop when turning on
the main valve and quick recharge. But it's probably unlikely the reserve
tubing was mucked with.
Other guess would be a variable leak downstream from the main valve. If
this were the case then it would appear to seal up a bit as pressure was
applied - but not completely - and is not allowing anything over 40atm. If
it were a bottle swap as in the first case then you'd still get the 55atm.
I'd bet on the leak. You should get this Bernouilli guy to check it out.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135804#135804
________________________________ Message 10
____________________________________
Time: 04:55:14 PM PST US
From: "Terry Lewis" <talew@bellsouth.net>
Subject: Re: Yak-List: Back to Tim's problem (was: Bernoilli, His Equation,
Air Moving in Pipes and Flight)
Water?
Terry
----- Original Message -----
From: "Brian Lloyd" <brian-1927@lloyd.com>
Sent: Saturday, September 22, 2007 3:45 PM
Subject: Yak-List: Back to Tim's problem (was: Bernoilli, His Equation, Air
Moving in Pipes and Flight)
>
> On Sep 22, 2007, at 11:53 AM, Tim Gagnon wrote:
>
>> pattern, gear down off the perch, big pressure drop (same pressure
>> drop)
>> and gear thumps nicely. Land with about 25 atm in the airplane. Run up,
>> pressure builds back up to 40 or so, but did something new this
>> time....hopefully not unsafe.
>>
>> Brakes on, run up to 70% for about a minute, pressure builds to
>> about
>> 40, then I SHUT OFF (engine still running) the main valve and the
>> pressure builds to about 55 ATM and I shut her down.
>
> One comment. Everything is working but you are getting a big pressure
> change with gear actuation and a rapid pressure recovery. If you had a
> leak, the pressure would keep going down but your pressure comes right
> back up again. That says to me, no leak. The big changes in pressure also
> tell me, small volume. Check your tank. Something is taking up a lot of
> space in there and leaving you with very little system volume.
>
>
> --
> Brian Lloyd 3191 Western Drive
> brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682
> +1.916.367.2131 (voice) +1.270.912.0788 (fax)
>
> I fly because it releases my mind from the tyranny of petty things . .
> . Antoine de Saint-Exupry
>
> PGP key ID: 12095C52A32A1B6C
> PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A
> 1B6C
>
>
>
________________________________ Message 11
____________________________________
Time: 05:06:11 PM PST US
From: Brian Lloyd <brian-1927@lloyd.com>
Subject: Re: Yak-List: Back to Tim's problem (was: Bernoilli, His Equation,
Air Moving in Pipes and Flight)
On Sep 22, 2007, at 4:54 PM, Terry Lewis wrote:
>
> Water?
Ah! I was trying to think of something that might be in the tank
taking up space but couldn't think of anything off hand. Water would
do it.
But as I said before, Tim needs to look everything over really well.
Something's rotten in Denmark. We are just guessing right now and
while I think my troubleshooting is well reasoned, it doesn't take
the place of actually going to look.
> Terry
--
Brian Lloyd 3191 Western Drive
brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
Antoine de Saint-Exupry
PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C
Message 18
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| Subject: | Re: Flap storage |
John,
There is no functional benefit to moving the flap handle away from the UP position.
In fact, you are depressurizing the flap actuator which removes all UP pressure
on the flaps. Then when you decide to move the flap handle to either
the UP or the DOWN position, you consume more air because you have to repressurize
the flap actuator. Since the flaps are UP after you put the flap handle
in the NEUTRAL position, if you put the flap hand to the DOWN position, the flaps
will slam to the down position because there is no pressure in the actuator
to act as a cushion when the flaps are moving. Hope this makes sense. Bottom
line....obtain a copy of the Russian translated flight manual and you will
find there is no mention of putting the flap handle in neutral except to give
control to the other cockpit. That is the only reason for the neutral position.
If it were a single cockpit airplane, it would not need a neutral position.
Dennis
---- John Graham <cubflyer1940@yahoo.com> wrote:
>
> Hello fellow fliers! Quick questions as I continue to
> learn about my Yak-52. When done flying, is it better
> to leave the FLAP handle in the full forward position
> or in the neutral position? Or does it matter one way
> or the other? Thanks!
>
> Thanks,
>
> John P. Graham
> CubFlyer1940@Yahoo.com
> Cell phone (847) 641-1330
>
>
> Catch up on fall's hot new shows on Yahoo! TV. Watch previews, get listings,
and more!
>
>
>
Message 19
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| Subject: | Re: Bernoilli, His Equation, Air Moving in Pipes and Flight |
But is the system only going from 40 to 55atm after the main valve is shut off
(and not before)? If so then it seems there must be a leak somewhere downstream
of the main valve.
mark.bitterlich(at)navy.m wrote:
> The pressure goes UP in the main system because when you shut the valve
> to the tank on a 50, the compressor is still creating more air pressure,
> and will continue to build pressure until the pop-off valve is released.
> Thus if you shut off the tank at 40, the gage will continue to show the
> pressure increase until the valve pops and releases as per normal
> operation.
>
> The 50 DOES also charge the emergency bottle as well as the main bottle,
> unlike the 52.
>
> --
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=136212#136212
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| Subject: | Re: 52 TW Tailwheel |
Hi Ira,
Gee, an idea I never considered! I assume you mean shortening the front end, since
the aft end is tapered to fit the tailwheel.
Just based on my mind's picture of my plane I wonder if enough can be sawed off
to make a measurable difference in the plane's attitude.
I'm off to fly a trip, but will take my tape measure to the hanger when I return.
-Steve
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=136215#136215
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| Subject: | Re: Bernoilli, His Equation, Air Moving in Pipes and Flight |
Good question//point.
Yes, if the bottle only fills to 40 and will not fill further, and then
when you close it, the gage goes rather quickly to 50 then your
hypothesis must be correct.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Scooter
Sent: Monday, September 24, 2007 19:19
Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight
But is the system only going from 40 to 55atm after the main valve is
shut off (and not before)? If so then it seems there must be a leak
somewhere downstream of the main valve.
mark.bitterlich(at)navy.m wrote:
> The pressure goes UP in the main system because when you shut the
> valve to the tank on a 50, the compressor is still creating more air
> pressure, and will continue to build pressure until the pop-off valve
is released.
> Thus if you shut off the tank at 40, the gage will continue to show
> the pressure increase until the valve pops and releases as per normal
> operation.
>
> The 50 DOES also charge the emergency bottle as well as the main
bottle,
> unlike the 52.
>
> --
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=136212#136212
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| Subject: | Re: Bernoilli, His Equation, Air Moving in Pipes and Flight |
My vote is for a downstream leak. With main off, tank fills to 55 easily. With
main open, in flight, etc, can only get to 40 so compressor is working but can't
keep up with the leaking air to get tank to 55. 40 is enough to move gear
but excessive loss of pressure is from a leak when you are moving more air through
the system by activating the gear (leak plus air needed to move gear).
BTW, Tim says emergency air pressure is rock solid at 60.
Does this make sense to Mark and others?
Craig
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=136239#136239
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Could also attach it by changing to a smaller diameter tail wheel too.
Doc
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Ira Saligman
Sent: Monday, September 24, 2007 2:22 PM
Subject: Yak-List: 52 TW Tailwheel
Has anyone shortened the bar holding the tailwheel on the 52TW. At the
current length, while on deck, the aircraft sits at an attitude well into
the flying envelope rather than at stall.
Ira Saligman
o 610 940 0420
c 610 324 5500
f 215 243 7699
isaligman@Saligman.com
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Yak-List Digest
Server
Sent: Sunday, September 23, 2007 2:59 AM
Subject: Yak-List Digest: 11 Msgs - 09/22/07
*
=================================================
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Total Messages Posted Sat 09/22/07: 11
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Today's Message Index:
----------------------
1. 06:56 AM - Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight (Ernie)
2. 11:43 AM - Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight (Tim Gagnon)
3. 11:43 AM - Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight (Tim Gagnon)
4. 11:54 AM - Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight (Tim Gagnon)
5. 11:57 AM - Can someone GIVE me 850K (Tim Gagnon)
6. 12:15 PM - Re: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight (Yak Pilot)
7. 12:40 PM - Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight (Tim Gagnon)
8. 12:46 PM - Back to Tim's problem (was: Bernoilli, His Equation, Air
Moving in Pipes and Flight) (Brian Lloyd)
9. 02:37 PM - Re: Back to Tim's problem (was: Bernoilli, His Equation,
Air Mov (Scooter)
10. 04:55 PM - Re: Back to Tim's problem (was: Bernoilli, His Equation,
Air Moving in Pipes and Flight) (Terry Lewis)
11. 05:06 PM - Re: Back to Tim's problem (was: Bernoilli, His Equation,
Air Moving in Pipes and Flight) (Brian Lloyd)
________________________________ Message 1
_____________________________________
Time: 06:56:30 AM PST US
Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight
From: "Ernie" <erniel29@gmail.com>
Magnus has no effect on the burrple destrofunkenspicthen, when bernouli
tickles his testicular nipplefricker. Now on the other hand, if you
diassemble the pooter evector during a combined molecular fusion
butterjamtoastgotshitonmyshirt event, then you may ripp the goddam wings off
of the plane.
Ernie
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135747#135747
________________________________ Message 2
_____________________________________
Time: 11:43:30 AM PST US
Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight
From: "Tim Gagnon" <NiftyYak50@fuse.net>
Ernie wrote:
> Magnus has no effect on the burrple destrofunkenspicthen, when
> bernouli tickles
his testicular nipplefricker. Now on the other hand, if you diassemble the
pooter evector during a combined molecular fusion
butterjamtoastgotshitonmyshirt event, then you may ripp the goddam wings off
of the plane.
>
> Ernie
Exactly.....
(The new spell checker went nuts on this)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135779#135779
________________________________ Message 3
_____________________________________
Time: 11:43:34 AM PST US
Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight
From: "Tim Gagnon" <NiftyYak50@fuse.net>
Ernie wrote:
> Magnus has no effect on the burrple destrofunkenspicthen, when
> bernouli tickles
his testicular nipplefricker. Now on the other hand, if you diassemble the
pooter evector during a combined molecular fusion
butterjamtoastgotshitonmyshirt event, then you may ripp the goddam wings off
of the plane.
>
> Ernie
Exactly.....
(The new spell checker went nuts on this)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135778#135778
________________________________ Message 4
_____________________________________
Time: 11:54:16 AM PST US
Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight
From: "Tim Gagnon" <NiftyYak50@fuse.net>
I spoke to the mechanic who did the work on my airplane. Before anyone jumps
on him for "shoulda known better", the guy does amazing work and the use of
the a smaller diameter line was talked about. His lack of experience with
Yaks and my...hmmm...lack of thorough knowledge lead us towards using the
fill line from the fill port instead of running a new line from the new
bottle (behind my seat). So, we will replace the line with one of original
diameter. We will also check for leaks....
Sooo......a few observations from todays flight and something that may add a
wrench to the works...OR....turn a light bulb on for someone.
Go to the airplane to fly this morning. Gauge reads about 40. Turn on the
main valve, pressure drops to about 20. Hmmmm...small leak somewhere
downstream of the bottle? (The airplane has been sitting for about a week or
so) She starts perfectly after a few blades, I let her warm up to 120c+ and
when I push the lever forward, I have about 40 ATM. This is after about 6 or
7 minutes from start to throttle up for take off. Making good pressure. Lift
off, gear handle up, that big pressure drop (20+ atm) but gears comes home
nicely with a reassuring thump. Pressure rebuilds to >55 ATM after somewhere
between 5-10 minutes of flying. Go flip around a bit, come back into the
pattern, gear down off the perch, big pressure drop (same pressure drop) and
gear thumps nicely. Land with about 25 atm in the airplane. Run up, pressure
builds back up to 40 or so, but did something new this time....hopefully not
unsafe.
Brakes on, run up to 70% for about a minute, pressure builds to about 40,
then I SHUT OFF (engine still running) the main valve and the pressure
builds to about 55 ATM and I shut her down.
I have some thoughts but want to verify mine with yours....you guys are way
smarter than I am.
I am glad this thread has generated some healthy, yet calm, discussion. I
have learned much...
One more question. What are you guys normal oil temps in cruise at a crusie
power setting.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135781#135781
________________________________ Message 5
_____________________________________
Time: 11:57:59 AM PST US
Subject: Yak-List: Can someone GIVE me 850K
From: "Tim Gagnon" <NiftyYak50@fuse.net>
I want this airplane!
http://www.courtesyaircraft.com/Lavochkin%20LA-9%20Spec.htm
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135782#135782
________________________________ Message 6
_____________________________________
Time: 12:15:10 PM PST US
From: Yak Pilot <yakplt@yahoo.com>
Subject: Re: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight
I am starting to wonder whether you might just have a bad gage. Checked for
that yet?
Mark
Tim Gagnon <NiftyYak50@fuse.net> wrote:
I spoke to the mechanic who did the work on my airplane. Before anyone jumps
on him for "shoulda known better", the guy does amazing work and the use of
the a smaller diameter line was talked about. His lack of experience with
Yaks and my...hmmm...lack of thorough knowledge lead us towards using the
fill line from the fill port instead of running a new line from the new
bottle (behind my seat). So, we will replace the line with one of original
diameter. We will also check for leaks....
Sooo......a few observations from todays flight and something that may add a
wrench to the works...OR....turn a light bulb on for someone.
Go to the airplane to fly this morning. Gauge reads about 40. Turn on the
main valve, pressure drops to about 20. Hmmmm...small leak somewhere
downstream of the bottle? (The airplane has been sitting for about a week or
so) She starts perfectly after a few blades, I let her warm up to 120c+ and
when I push the lever forward, I have about 40 ATM. This is after about 6 or
7 minutes from start to throttle up for take off. Making good pressure. Lift
off, gear handle up, that big pressure drop (20+ atm) but gears comes home
nicely with a reassuring thump. Pressure rebuilds to >55 ATM after somewhere
between 5-10 minutes of flying. Go flip around a bit, come back into the
pattern, gear down off the perch, big pressure drop (same pressure drop) and
gear thumps nicely. Land with about 25 atm in the airplane. Run up, pressure
builds back up to 40 or so, but did something new this time....hopefully not
unsafe.
Brakes on, run up to 70% for about a minute, pressure builds to about 40,
then I SHUT OFF (engine still running) the main valve and the pressure
builds to about 55 ATM and I shut her down.
I have some thoughts but want to verify mine with yours....you guys are way
smarter than I am.
I am glad this thread has generated some healthy, yet calm, discussion. I
have learned much...
One more question. What are you guys normal oil temps in cruise at a crusie
power setting.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135781#135781
________________________________ Message 7
_____________________________________
Time: 12:40:25 PM PST US
Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight
From: "Tim Gagnon" <NiftyYak50@fuse.net>
Nope...but I will add that to the list of things to check!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135791#135791
________________________________ Message 8
_____________________________________
Time: 12:46:14 PM PST US
From: Brian Lloyd <brian-1927@lloyd.com>
Subject: Yak-List: Back to Tim's problem (was: Bernoilli, His Equation, Air
Moving in Pipes and Flight)
On Sep 22, 2007, at 11:53 AM, Tim Gagnon wrote:
> pattern, gear down off the perch, big pressure drop (same pressure
> drop) and gear thumps nicely. Land with about 25 atm in the
> airplane. Run up, pressure builds back up to 40 or so, but did
> something new this time....hopefully not unsafe.
>
> Brakes on, run up to 70% for about a minute, pressure builds to
> about 40, then I SHUT OFF (engine still running) the main valve and
> the pressure builds to about 55 ATM and I shut her down.
One comment. Everything is working but you are getting a big pressure
change with gear actuation and a rapid pressure recovery. If you had
a leak, the pressure would keep going down but your pressure comes
right back up again. That says to me, no leak. The big changes in
pressure also tell me, small volume. Check your tank. Something is
taking up a lot of space in there and leaving you with very little
system volume.
--
Brian Lloyd 3191 Western Drive
brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
Antoine de Saint-Exupry
PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C
________________________________ Message 9
_____________________________________
Time: 02:37:48 PM PST US
Subject: Yak-List: Re: Back to Tim's problem (was: Bernoilli, His Equation,
Air Mov
From: "Scooter" <yakk52@verizon.net>
I can't recall how the Yak-50 air system is set up... If this were a 52 I'd
almost think (going under Brian's theory) that the main and reserve bottles
were swapped. This would account for a big pressure drop when turning on
the main valve and quick recharge. But it's probably unlikely the reserve
tubing was mucked with.
Other guess would be a variable leak downstream from the main valve. If
this were the case then it would appear to seal up a bit as pressure was
applied - but not completely - and is not allowing anything over 40atm. If
it were a bottle swap as in the first case then you'd still get the 55atm.
I'd bet on the leak. You should get this Bernouilli guy to check it out.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135804#135804
________________________________ Message 10
____________________________________
Time: 04:55:14 PM PST US
From: "Terry Lewis" <talew@bellsouth.net>
Subject: Re: Yak-List: Back to Tim's problem (was: Bernoilli, His Equation,
Air Moving in Pipes and Flight)
Water?
Terry
----- Original Message -----
From: "Brian Lloyd" <brian-1927@lloyd.com>
Sent: Saturday, September 22, 2007 3:45 PM
Subject: Yak-List: Back to Tim's problem (was: Bernoilli, His Equation, Air
Moving in Pipes and Flight)
>
> On Sep 22, 2007, at 11:53 AM, Tim Gagnon wrote:
>
>> pattern, gear down off the perch, big pressure drop (same pressure
>> drop)
>> and gear thumps nicely. Land with about 25 atm in the airplane. Run up,
>> pressure builds back up to 40 or so, but did something new this
>> time....hopefully not unsafe.
>>
>> Brakes on, run up to 70% for about a minute, pressure builds to
>> about
>> 40, then I SHUT OFF (engine still running) the main valve and the
>> pressure builds to about 55 ATM and I shut her down.
>
> One comment. Everything is working but you are getting a big pressure
> change with gear actuation and a rapid pressure recovery. If you had a
> leak, the pressure would keep going down but your pressure comes right
> back up again. That says to me, no leak. The big changes in pressure also
> tell me, small volume. Check your tank. Something is taking up a lot of
> space in there and leaving you with very little system volume.
>
>
> --
> Brian Lloyd 3191 Western Drive
> brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682
> +1.916.367.2131 (voice) +1.270.912.0788 (fax)
>
> I fly because it releases my mind from the tyranny of petty things . .
> . Antoine de Saint-Exupry
>
> PGP key ID: 12095C52A32A1B6C
> PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A
> 1B6C
>
>
>
________________________________ Message 11
____________________________________
Time: 05:06:11 PM PST US
From: Brian Lloyd <brian-1927@lloyd.com>
Subject: Re: Yak-List: Back to Tim's problem (was: Bernoilli, His Equation,
Air Moving in Pipes and Flight)
On Sep 22, 2007, at 4:54 PM, Terry Lewis wrote:
>
> Water?
Ah! I was trying to think of something that might be in the tank
taking up space but couldn't think of anything off hand. Water would
do it.
But as I said before, Tim needs to look everything over really well.
Something's rotten in Denmark. We are just guessing right now and
while I think my troubleshooting is well reasoned, it doesn't take
the place of actually going to look.
> Terry
--
Brian Lloyd 3191 Western Drive
brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
Antoine de Saint-Exupry
PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C
Message 24
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| Subject: | Re: Bernoilli, His Equation, Air Moving in Pipes and Flight |
Guys,
What makes sense is a set of jacks and a gear retraction test done on those
jacks. Otherwise this is all mental masturbation.
Doc
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Craig Winkelmann,
CFI
Sent: Monday, September 24, 2007 8:36 PM
Subject: Yak-List: Re: Bernoilli, His Equation, Air Moving in Pipes and
Flight
My vote is for a downstream leak. With main off, tank fills to 55 easily.
With main open, in flight, etc, can only get to 40 so compressor is working
but can't keep up with the leaking air to get tank to 55. 40 is enough to
move gear but excessive loss of pressure is from a leak when you are moving
more air through the system by activating the gear (leak plus air needed to
move gear).
BTW, Tim says emergency air pressure is rock solid at 60.
Does this make sense to Mark and others?
Craig
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=136239#136239
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HI Joe;
Do you have some photos?????????ChanockBorn to fly, Forced to work
ak18T projectTo: yak-list@matronics.com
yak18T project for sale, any interest?
Joe for details
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