Today's Message Index:
----------------------
1. 12:03 AM - Re: SURGING YAK (Lee Taylor)
2. 12:17 AM - Re: SURGING YAK (Lee Taylor)
3. 03:39 AM - Re: SURGING YAK (Frank Haertlein)
4. 04:08 AM - Re: SURGING YAK (A. Dennis Savarese)
5. 05:16 AM - Re: SURGING YAK (Walt Fricke)
6. 05:31 AM - Re: SURGING YAK (A. Dennis Savarese)
7. 11:03 AM - Yak-55 smoke tank mounting ideas? (Coffey, John)
8. 11:34 AM - Yak maintenance course (Coffey, John)
9. 03:43 PM - Re: Yak-55 smoke tank mounting ideas? (AirshowPilot1@aol.com)
10. 04:26 PM - Re: Yak-List Digest: 8 Msgs - 06/02/03 (John W Finley)
11. 04:54 PM - Need weight and balance for Yak-55 .. not 55M ... (William Halverson)
12. 05:28 PM - Re: Need weight and balance for Yak-55 .. not 55M ... (Gus Fraser)
13. 06:11 PM - Re: Trim (Brian Lloyd)
14. 07:00 PM - Re: Trim (A. Dennis Savarese)
15. 07:48 PM - Re: Trim (Gus Fraser)
16. 10:42 PM - Re: Trim (N13472@aol.com)
Message 1
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Yak-List message posted by: "Lee Taylor" <leetay@idcomm.com>
Yaksters;
Taking off early last Sunday I noticed the engine / prop "SURGING". You
could feel, by the seat of your pants, the variations in acceleration
after I had leveled out and reduced power to 80%. It wasn't markedly
pronounced but I could definably feel a slight acceleration and then
deceleration repeated about a half dozen times before it stopped. My
first thought was it had to do with variations in prop pitch as the
engine RPM remained constant. My guess is it has something to do with
the prop governor.
Anybody got any ideas as to where to look to solve the problem?
Thanks in advance!
Frank
N9110M
Frank: Almost certainly the prop governor, and some of the other guys
mentioned the possibility of air in the hub, which I would tend to agree
with.
This has to do with ANY CS prop. (I'm not an expert on your prop).
Most people that I check out run the prop control JUST BARELY ENOUGH on
runup to get a drop, then immediately push the control back to fine
pitch. This just isn't enough.
Watch your power so that you don't overboost as you are doing
this, but when you pull the prop back on runup, pull it ALL THE WAY
back, and let it get ALL THE WAY to full coarse pitch. Then back to fine
pitch, making sure it gets all the way back there. On the first flight
of a day, I usually go through this sequence three times. This flushes
fresh warm oil up into the hub, and fully exercises all the bearings
thru their entire range of travel. If you don't let the prop go all the
way, this range never gets fully exercised, and that can cause problems
eventually.
Also, fully exercising the prop like this on runup will give you
the highest probability of flushing out any air problems.
If this procedure doesn't eliminate your surging problem, then,
(sorry!) you probably have a governor problem. Since it went away after
a few cycles, tho, I don't think that is true. Probably just some air
that needed to get cycled out. Fix that problem on the ground, on
runup, as suggested.
Lee Taylor
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Yak-List message posted by: "Lee Taylor" <leetay@idcomm.com>
OOPS, Frank,
In my previous response to your problem, I followed others' leads in
suggesting a possible governor problem, maybe air in the hub, and ways
to clear that on runup.
However, on rereading your problem, you say, "RPM remained
constant."
If the governor was at fault, there would have been RPM surging, not
power surging. If the RPM was constant, then the governor was doing its
job. The surge under these conditions would have to be caused by POWER,
not prop.
I'm not familiar enough with the Yak carb/fuel flow setup details to
suggest something there.
Lee Taylor
Yaksters;
Taking off early last Sunday I noticed the engine / prop "SURGING". You
could feel, by the seat of your pants, the variations in acceleration
after I had leveled out and reduced power to 80%. It wasn't markedly
pronounced but I could definably feel a slight acceleration and then
deceleration repeated about a half dozen times before it stopped. My
first thought was it had to do with variations in prop pitch as the
engine RPM remained constant. My guess is it has something to do with
the prop governor.
Anybody got any ideas as to where to look to solve the problem?
Thanks in advance!
Frank
N9110M
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Yak-List message posted by: "Frank Haertlein" <yak52driver@earthlink.net>
Lee;
My tach has a slight, random fluctuation under normal conditions (maybe
+ or - 2%). I've never worried about it too much because the rear tach
is stable. What I'm trying to say is that engine RPM could have varied
slightly during the "SURGING" and I may not have noticed it. I thought
RPM was constant but now I'm not 100% sure of that.
Gus;
Interestingly, it was my second takeoff that day and only 15 minutes or
so after landing. I'd stopped to see a friend at his hanger and he
wasn't there yet so I took off again right away. I usually exercise the
prop but that time I didn't do it. From now on it's going to be a fully
exercised prop every time I do a full stop.
This does bring up an interesting question though.
If the prop governor does fail what is the usual failure mode, high
pitch or low pitch?
Thanks to all :)
Frank
N9110M
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Yak-List message posted by: "A. Dennis Savarese" <adsavar@gte.net>
Frank,
Think of what the counter weights do and you will have the answer.
Dennis Savarese
----- Original Message -----
From: "Frank Haertlein" <yak52driver@earthlink.net>
Subject: RE: Yak-List: SURGING YAK
> --> Yak-List message posted by: "Frank Haertlein"
<yak52driver@earthlink.net>
>
> Lee;
> My tach has a slight, random fluctuation under normal conditions (maybe
> + or - 2%). I've never worried about it too much because the rear tach
> is stable. What I'm trying to say is that engine RPM could have varied
> slightly during the "SURGING" and I may not have noticed it. I thought
> RPM was constant but now I'm not 100% sure of that.
>
> Gus;
> Interestingly, it was my second takeoff that day and only 15 minutes or
> so after landing. I'd stopped to see a friend at his hanger and he
> wasn't there yet so I took off again right away. I usually exercise the
> prop but that time I didn't do it. From now on it's going to be a fully
> exercised prop every time I do a full stop.
>
> This does bring up an interesting question though.
>
> If the prop governor does fail what is the usual failure mode, high
> pitch or low pitch?
>
> Thanks to all :)
> Frank
> N9110M
>
>
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Yak-List message posted by: Walt Fricke <walterfricke@yahoo.com>
Dennis,
You missed your calling. You should be a teacher. (The highest calling, by the
way.)
"A. Dennis Savarese" <adsavar@gte.net> wrote:
--> Yak-List message posted by: "A. Dennis Savarese"
Frank,
Think of what the counter weights do and you will have the answer.
Dennis Savarese
----- Original Message -----
From: "Frank Haertlein"
Subject: RE: Yak-List: SURGING YAK
> --> Yak-List message posted by: "Frank Haertlein"
>
> Lee;
> My tach has a slight, random fluctuation under normal conditions (maybe
> + or - 2%). I've never worried about it too much because the rear tach
> is stable. What I'm trying to say is that engine RPM could have varied
> slightly during the "SURGING" and I may not have noticed it. I thought
> RPM was constant but now I'm not 100% sure of that.
>
> Gus;
> Interestingly, it was my second takeoff that day and only 15 minutes or
> so after landing. I'd stopped to see a friend at his hanger and he
> wasn't there yet so I took off again right away. I usually exercise the
> prop but that time I didn't do it. From now on it's going to be a fully
> exercised prop every time I do a full stop.
>
> This does bring up an interesting question though.
>
> If the prop governor does fail what is the usual failure mode, high
> pitch or low pitch?
>
> Thanks to all :)
> Frank
> N9110M
>
>
---------------------------------
Free online calendar with sync to Outlook(TM).
Message 6
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Yak-List message posted by: "A. Dennis Savarese" <adsavar@gte.net>
I am in a way. I teach a 2 day comprehensive YAK 52/M14 maintenance
training course.
Dennis
----- Original Message -----
From: "Walt Fricke" <walterfricke@yahoo.com>
Subject: Re: Yak-List: SURGING YAK
> --> Yak-List message posted by: Walt Fricke <walterfricke@yahoo.com>
>
> Dennis,
> You missed your calling. You should be a teacher. (The highest calling,
by the way.)
>
> "A. Dennis Savarese" <adsavar@gte.net> wrote:
> --> Yak-List message posted by: "A. Dennis Savarese"
>
> Frank,
> Think of what the counter weights do and you will have the answer.
> Dennis Savarese
>
> ----- Original Message -----
> From: "Frank Haertlein"
> To:
> Subject: RE: Yak-List: SURGING YAK
>
>
> > --> Yak-List message posted by: "Frank Haertlein"
>
> >
> > Lee;
> > My tach has a slight, random fluctuation under normal conditions (maybe
> > + or - 2%). I've never worried about it too much because the rear tach
> > is stable. What I'm trying to say is that engine RPM could have varied
> > slightly during the "SURGING" and I may not have noticed it. I thought
> > RPM was constant but now I'm not 100% sure of that.
> >
> > Gus;
> > Interestingly, it was my second takeoff that day and only 15 minutes or
> > so after landing. I'd stopped to see a friend at his hanger and he
> > wasn't there yet so I took off again right away. I usually exercise the
> > prop but that time I didn't do it. From now on it's going to be a fully
> > exercised prop every time I do a full stop.
> >
> > This does bring up an interesting question though.
> >
> > If the prop governor does fail what is the usual failure mode, high
> > pitch or low pitch?
> >
> > Thanks to all :)
> > Frank
> > N9110M
> >
> >
>
>
> ---------------------------------
> Free online calendar with sync to Outlook(TM).
>
>
Message 7
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Yak-55 smoke tank mounting ideas? |
"Yak-List (E-mail)" <yak-list@matronics.com>
--> Yak-List message posted by: "Coffey, John" <john.coffey@attws.com>
I'm looking for ideas on how best to mount a smoke tank in a Yak-55m.
If you have a Yak-55 with a smoke tank, I'd very much appreciate receiving a description
of how your tank is mounted.
Some PICTURES of your tank installation would be VERY much appreciated, too.
Thanks!
John Coffey
Yak-55m Lover
Message 8
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Yak maintenance course |
--> Yak-List message posted by: "Coffey, John" <john.coffey@attws.com>
Dennis,
I didn't know you did Yak maintenance training.
I'm interested in some specifics of your maint. course.
Where?
Cost?
How do I get on the schedule?
Typical and Minimum class sizes?
Course outline?
Did you receive training at a Russian factory?
Cheers,
John Coffey
Yak-55m Lover
-----Original Message-----
From: A. Dennis Savarese [mailto:adsavar@gte.net]
Subject: Re: Yak-List: SURGING YAK
--> Yak-List message posted by: "A. Dennis Savarese" <adsavar@gte.net>
I am in a way. I teach a 2 day comprehensive YAK 52/M14 maintenance
training course.
Dennis
Message 9
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Yak-55 smoke tank mounting ideas? |
--> Yak-List message posted by: AirshowPilot1@aol.com
I have an installation in my 55M. It is aft of the seat in the bracing for the data recorder. It is braced with square tube and held in place with 1 inch stainless straps. I had a set of blueprints but I can't find em anymore. If you are near any of my shows, stop and I will show the setup - www.paramountaerobatics.com for the schedule.
Walt Addison Linscott
Message 10
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Yak-List Digest: 8 Msgs - 06/02/03 |
--> Yak-List message posted by: John W Finley <finleycj6@juno.com>
Frank,
First check if your oil pressure is fluctuating near min pressure. If
this coincides with the "surge" just adjust your oil pressure up to at
least 4. It worked with me...John
Message 11
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Need weight and balance for Yak-55 .. not 55M ... |
--> Yak-List message posted by: William Halverson <william@netpros.net>
Hi folks -
In looking at what IAC wants to let you fly in a competition I notice
they want a weight and balance form for your a/c.
My manuals are for the YAK-55M ... and while I expect the 55 has the
same moments and locations .. I can't find any data on the positions of
the oil, fuel, and pilot to do a W&B calculation .. and the overall
weight may be different, too.
Any advice/leads greatly appreciated, as the first contest I thought I'd
enter starts this Thursday ...
Bill Halverson
Message 12
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Need weight and balance for Yak-55 .. not 55M ... |
--> Yak-List message posted by: Gus Fraser <fraseg@comcast.net>
Bill,
You can choose any point as a reference for the W&B just measure from the
same point to all major locations. The Yak 52 traditionally uses frame 5.
Mine is done from the front of the hub, it just makes the maths easier :) I
am a bear with a very small brain.....
The only important figures that you need is the max forward and rear CG
limits these you will need to get from a fellow 55 owner. I have a set of 55
logbooks in my hanger so if you don't have the details you need I can see if
it is in there.
Gus
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com]On Behalf Of William
Halverson
Subject: Yak-List: Need weight and balance for Yak-55 .. not 55M ...
--> Yak-List message posted by: William Halverson <william@netpros.net>
Hi folks -
In looking at what IAC wants to let you fly in a competition I notice
they want a weight and balance form for your a/c.
My manuals are for the YAK-55M ... and while I expect the 55 has the
same moments and locations .. I can't find any data on the positions of
the oil, fuel, and pilot to do a W&B calculation .. and the overall
weight may be different, too.
Any advice/leads greatly appreciated, as the first contest I thought I'd
enter starts this Thursday ...
Bill Halverson
Message 13
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Yak-List message posted by: Brian Lloyd <brian@lloyd.com>
Frank Haertlein wrote:
> Given we're talking about the M14 and a new or freshly overhauled engine
> just past break-in, what is the best possible oil to run with long
> engine life in mind?
Phillips 20W50-M mineral break-in oil for the first 50 hours or so.
> What is the ultimate oil to run in your engine even
> if cost is not a factor?
Phillips 25W60 radial engine oil.
--
Brian Lloyd 6501 Red Hook Plaza, Suite 201
brian@lloyd.com St. Thomas, VI 00802
+1.340.998.9447 - voice +1.360.838.9669 - fax
GMT-4
Message 14
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Yak-List message posted by: "A. Dennis Savarese" <adsavar@gte.net>
Philips 25W-60, which was designed for radial engines, at least according to
the Philips propaganda. Can also be used for break-in without any problems.
Dennis Savarese
----- Original Message -----
From: "Brian Lloyd" <brian@lloyd.com>
Subject: Re: Yak-List: Trim
> --> Yak-List message posted by: Brian Lloyd <brian@lloyd.com>
>
> Frank Haertlein wrote:
> > Given we're talking about the M14 and a new or freshly overhauled engine
> > just past break-in, what is the best possible oil to run with long
> > engine life in mind?
>
> Phillips 20W50-M mineral break-in oil for the first 50 hours or so.
>
> > What is the ultimate oil to run in your engine even
> > if cost is not a factor?
>
> Phillips 25W60 radial engine oil.
>
> --
>
> Brian Lloyd 6501 Red Hook Plaza, Suite 201
> brian@lloyd.com St. Thomas, VI 00802
> +1.340.998.9447 - voice +1.360.838.9669 - fax
> GMT-4
>
>
Message 15
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Yak-List message posted by: Gus Fraser <fraseg@comcast.net>
I switched to Philips 25w60 last annual from 100 and 60/80 and I have used
it for a full year with no problems. Infact I bought a 55 gal drum of the
stuff for the hanger.
Gus CU@OSH Fraser
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com]On Behalf Of A. Dennis
Savarese
Subject: Re: Yak-List: Trim
--> Yak-List message posted by: "A. Dennis Savarese" <adsavar@gte.net>
Philips 25W-60, which was designed for radial engines, at least according to
the Philips propaganda. Can also be used for break-in without any problems.
Dennis Savarese
----- Original Message -----
From: "Brian Lloyd" <brian@lloyd.com>
Subject: Re: Yak-List: Trim
> --> Yak-List message posted by: Brian Lloyd <brian@lloyd.com>
>
> Frank Haertlein wrote:
> > Given we're talking about the M14 and a new or freshly overhauled engine
> > just past break-in, what is the best possible oil to run with long
> > engine life in mind?
>
> Phillips 20W50-M mineral break-in oil for the first 50 hours or so.
>
> > What is the ultimate oil to run in your engine even
> > if cost is not a factor?
>
> Phillips 25W60 radial engine oil.
>
> --
>
> Brian Lloyd 6501 Red Hook Plaza, Suite 201
> brian@lloyd.com St. Thomas, VI 00802
> +1.340.998.9447 - voice +1.360.838.9669 - fax
> GMT-4
>
>
Message 16
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Yak-List message posted by: N13472@aol.com
Gus what did the 25W60 cost you in the 55 gal qty's ???
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|