Today's Message Index:
----------------------
1. 03:35 AM - Fluctuating RPM's on 912 S (Lowell Metz)
2. 06:46 AM - Re: Fluctuating RPM's on 912 S (Jeff Small)
3. 08:57 AM - Re: Re aileron Gap Seals (HINDE,FRANK (HP-Corvallis,ex1))
4. 09:03 AM - Re: Re aileron Gap Seals (HINDE,FRANK (HP-Corvallis,ex1))
5. 10:20 AM - Re: Fluctuating RPM's on 912 S (Richard McLachlan)
6. 12:27 PM - Re: 12V Heaters (Garrou, Douglas)
7. 12:36 PM - Re: Fluctuating RPM's on 912 S (Dave Alberti)
8. 01:23 PM - Re: 12V Heaters (HINDE,FRANK (HP-Corvallis,ex1))
9. 01:33 PM - inst.panel701 (Flydog1966@aol.com)
10. 03:24 PM - Re: 12V Heaters (Bill Cardell)
11. 04:47 PM - Re: inst.panel701 (ZSMITH3rd@aol.com)
Message 1
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| Subject: | Fluctuating RPM's on 912 S |
--> Zenith-List message posted by: "Lowell Metz" <lowellmetz@earthlink.net>
List,
Once again I outsmarted myself and thought I would pass on another lesson
learned. As reported 3 weeks ago I had some RPM fluctuations from about 3,000
on up to full power changing as much as 700 RPM's without changing the throttle.
( Makes you pucker a little in flight ) A lot of you responded with your
thoughts, all of which I checked out but without success. I have ordered the
carb sync gages but have not received them yet but have found the cause of the
fluctuation. To prevent any fuel from the carb floatbowl vent tubes from running
onto my muffler I put a "T" in the line and ran a tube down the firewall,
out the bottom of the plane and into the slip stream. While re-reading the carb
tuning instructions I ran across one sentence that said to keep that line free
from airflow and have it so there is a low spot drain so fuel would not settle
and block the line. ( Something to that effect ) I took the line leading
to the slipstream off , tied the plane down and went through a good test. BINGO...
No fluctuations and no shaking as the engine slowed down. I was creating
a pressure differential in the carbs. As soon as the carb Sync gages come
I will go through that procedure as well but think I found the cause/ effect.
I am getting a higher EGT than I would like tied to the tree but hope it will
not rise that much once the engine and prop are unloaded in free air.
Lowell Metz
701 Venice FL.
Message 2
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| Subject: | Re: Fluctuating RPM's on 912 S |
Seal-Send-Time: Mon, 23 Feb 2004 09:48:19 -0500
--> Zenith-List message posted by: "Jeff Small" <zodiacjeff@msn.com>
>While re-reading the carb tuning instructions I ran across one sentence that said
to keep that line free from airflow and have it so there is a low spot drain
so fuel would not settle and block the line. ( Something to that effect
Lowell,
George Pinneo and the Canadian Mikes warned of this problem back in '98 and '99.
I don't have a 912 so it never dawned on me.
See Zenair Newletter issue 108, page 3, Sept/Oct 1998
and issue 110, page 2, Jan/Feb 1999 for a neat way of avoiding the problem but
still getting fuel out of the cowl and away from hot exhaust system.
Message 3
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| Subject: | Re aileron Gap Seals |
--> Zenith-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
-----Original Message-----
From: owner-zenith-list-server@matronics.com
[mailto:owner-zenith-list-server@matronics.com] On Behalf Of Norm Turner
Subject: Zenith-List: Re aileron Gap Seals
--> Zenith-List message posted by: "Norm Turner"
--> <normsflighttraining@bigpond.com>
Hi to all on the list, Have been reading with interest over the last few
weeks on the subject of aileron gap seals. This is how It all started for me
! . About 6months ago I sent an email to ZAC on this subject and got there
response which has been covered very well in answers to questions on the
list, MAKE DAM SURE you leave enough length on full aileron deflection so
that it will not jam your ailerons!!!!. I have a 601 HDS and during my last
flight of 4250nm round trip mostly in rain storms that the water flow over
the wings would stop @ the aileron hinges and go down through them . This
made me think of what lift I was loosing on the HDS wing, and also posed the
question of WHY the negative pressure under the wing / ailerons?It should be
positive if the critical Aof Attack is not exceeded . Not being an aircraft
engineer, one must think it out in layman's terms. Look @ the gap between
aileron and trailing edge of the wing and just think about what the airflow
is going to ! do in flight. Seems to me that there is a vortex being
produced @ that gap , changing the airflow and sucking the air through the
hinges. For the people who have hingless ailerons all you have to think
about is the DRAG produced,IF any, but like me I have to think about the
drag and the loss of lift. I will be doing some experiments soon on this by
first using tape under the hinges and then the gap seal. Which some on the
list have mentioned / RE the extension of the bottom skin / or de riveting
and installing a piece of aluminium with a rub contact on the aileron to
save the paint work , BUT this piece MUST BE LONG ENOUGH so not to catch and
spoil your day. Cheers and safe flying Norm Turner, 601 HDS Rotax 912 /
295Hrs.
advertising on the Matronics Forums.
Message 4
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| Subject: | Re aileron Gap Seals |
--> Zenith-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
Hey Norm,
Please do be sure to document your results of testing on this list. I too
have questioned the effectiveness of the HDS wing (W hinged ailerons
although I think the loss of lift should be fairly small) in fact the bird
seems to "run out of wing" at fairly low altitudes , i.e the the nose starts
to pitch up at around 10k feet density altitude in order to maintain level
flight. In other words the angle of attack needs to be increased.
Of course this is adding drag and degrading the speed performance of the
airframe.
I wonder what it would take to rip the wing off and attatch the fuse to an
RV-9 wing?...But that might take longer than building an RV-9 from scratch?
Dream on
Frank
601 HDS, Stratus with Ram heads 314 hours
Do not archive
-----Original Message-----
From: owner-zenith-list-server@matronics.com
[mailto:owner-zenith-list-server@matronics.com] On Behalf Of Norm Turner
Subject: Zenith-List: Re aileron Gap Seals
--> Zenith-List message posted by: "Norm Turner"
--> <normsflighttraining@bigpond.com>
Hi to all on the list, Have been reading with interest over the last few
weeks on the subject of aileron gap seals. This is how It all started for me
! . About 6months ago I sent an email to ZAC on this subject and got there
response which has been covered very well in answers to questions on the
list, MAKE DAM SURE you leave enough length on full aileron deflection so
that it will not jam your ailerons!!!!. I have a 601 HDS and during my last
flight of 4250nm round trip mostly in rain storms that the water flow over
the wings would stop @ the aileron hinges and go down through them . This
made me think of what lift I was loosing on the HDS wing, and also posed the
question of WHY the negative pressure under the wing / ailerons?It should be
positive if the critical Aof Attack is not exceeded . Not being an aircraft
engineer, one must think it out in layman's terms. Look @ the gap between
aileron and trailing edge of the wing and just think about what the airflow
is going to ! do in flight. Seems to me that there is a vortex being
produced @ that gap , changing the airflow and sucking the air through the
hinges. For the people who have hingless ailerons all you have to think
about is the DRAG produced,IF any, but like me I have to think about the
drag and the loss of lift. I will be doing some experiments soon on this by
first using tape under the hinges and then the gap seal. Which some on the
list have mentioned / RE the extension of the bottom skin / or de riveting
and installing a piece of aluminium with a rub contact on the aileron to
save the paint work , BUT this piece MUST BE LONG ENOUGH so not to catch and
spoil your day. Cheers and safe flying Norm Turner, 601 HDS Rotax 912 /
295Hrs.
advertising on the Matronics Forums.
Message 5
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| Subject: | Re: Fluctuating RPM's on 912 S |
--> Zenith-List message posted by: "Richard McLachlan" <richard@rodsley.net>
That problem caused an engine failure after takeoff last year on a CH601 in
the UK, where somebody had done exactly that mod and the low pressure area
where the drip tube vented sucked all the fuel out of the carbs.
----- Original Message -----
From: "Lowell Metz" <lowellmetz@earthlink.net>
Subject: Zenith-List: Fluctuating RPM's on 912 S
> --> Zenith-List message posted by: "Lowell Metz"
<lowellmetz@earthlink.net>
>
> List,
> Once again I outsmarted myself and thought I would pass on another
lesson learned. As reported 3 weeks ago I had some RPM fluctuations from
about 3,000 on up to full power changing as much as 700 RPM's without
changing the throttle. ( Makes you pucker a little in flight ) A lot of you
responded with your thoughts, all of which I checked out but without
success. I have ordered the carb sync gages but have not received them yet
but have found the cause of the fluctuation. To prevent any fuel from the
carb floatbowl vent tubes from running onto my muffler I put a "T" in the
line and ran a tube down the firewall, out the bottom of the plane and into
the slip stream. While re-reading the carb tuning instructions I ran across
one sentence that said to keep that line free from airflow and have it so
there is a low spot drain so fuel would not settle and block the line. (
Something to that effect ) I took the line leading to the slipstream off ,
tied the plane down and we!
> nt through a good test. BINGO... No fluctuations and no shaking as the
engine slowed down. I was creating a pressure differential in the carbs.
As soon as the carb Sync gages come I will go through that procedure as well
but think I found the cause/ effect. I am getting a higher EGT than I would
like tied to the tree but hope it will not rise that much once the engine
and prop are unloaded in free air.
> Lowell Metz
> 701 Venice FL.
>
>
Message 6
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--> Zenith-List message posted by: "Garrou, Douglas" <dgarrou@hunton.com>
Informal, non-scientific, but possibly educational survey:
What is the total number of EA-81 in-flight engine failures we can identify just
among members of this list? I guess I'll count as a failure (a) any time the
engine flat-out quits while flying or (b) any time the engine starts behaving
so badly you have to land for fear of dying.
I guess we start with Frank's 3 to begin with.
Doug G.
-------------------
Time: 03:40:09 AM PST US
From: Andrew SanClemente <ansancle@townisp.com>
Subject: Zenith-List: 12V Heaters
Do all stratus EA-81's need the valve guides
replaced?? I live in the northeast and the chances of surviving 3
engine outs are slim, not many suitable landing fields.
Message 7
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| Subject: | Fluctuating RPM's on 912 S |
--> Zenith-List message posted by: "Dave Alberti" <daberti@execpc.com>
At the Rotax engine school, the instructor indicated that those lines should
not be altered in length or routing. They balance the atmospheric pressure
in the carbs and any changes to the length or "Teeing" them together can
result in serious problems.
Dave
--> Zenith-List message posted by: "Lowell Metz" <lowellmetz@earthlink.net>
List,
Once again I outsmarted myself.........muffler I put a "T" in the line
and ran a tube down the firewall, out the bottom of the plane and into the
slip stream. I was creating a pressure differential in the carbs. As
soon as the carb Sync gages come I will go through that procedure as well
but think I found the cause/ effect.
Lowell Metz
701 Venice FL.
Message 8
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--> Zenith-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
I would add c) May not have necessarily caused you to land but when you
pulled the heads off you felt lucky to be alive!
Frank
-----Original Message-----
From: owner-zenith-list-server@matronics.com
[mailto:owner-zenith-list-server@matronics.com] On Behalf Of Garrou, Douglas
Subject: RE: Zenith-List: 12V Heaters
--> Zenith-List message posted by: "Garrou, Douglas"
--> <dgarrou@hunton.com>
Informal, non-scientific, but possibly educational survey:
What is the total number of EA-81 in-flight engine failures we can identify
just among members of this list? I guess I'll count as a failure (a) any
time the engine flat-out quits while flying or (b) any time the engine
starts behaving so badly you have to land for fear of dying.
I guess we start with Frank's 3 to begin with.
Doug G.
-------------------
Time: 03:40:09 AM PST US
From: Andrew SanClemente <ansancle@townisp.com>
Subject: Zenith-List: 12V Heaters
Do all stratus EA-81's need the valve guides
replaced?? I live in the northeast and the chances of surviving 3
engine outs are slim, not many suitable landing fields.
advertising on the Matronics Forums.
Message 9
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--> Zenith-List message posted by: Flydog1966@aol.com
701 list members. I made my instrument panel today. Held it in position
435mm
above the floor,and vertical. The dwgs show 390mm between it and the
firewall, but I have ~435mm. I checked the angle of the firewall, and it looks
OK.
Has anyone else found this dimension way-off?
Baffled Phil
Yahoo, its gettin warmer in the shop!
do not archive
Message 10
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--> Zenith-List message posted by: Bill Cardell <bill@flyinmiata.com>
Frank,
Maybe rename the thread so it doesn't get lost? People may not be reading
the heater thread by now.
Bill Cardell (TurboDog's Dad)
bill@flyinmiata.com
Flyin' Miata
1-800-359-6957 (sales only)
970-242-3800 (tech support)
http://flyinmiata.com
http://flyinprotege.com
-----Original Message-----
From: HINDE,FRANK (HP-Corvallis,ex1) [mailto:frank.hinde@hp.com]
Subject: RE: Zenith-List: 12V Heaters
--> Zenith-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)"
<frank.hinde@hp.com>
I would add c) May not have necessarily caused you to land but when you
pulled the heads off you felt lucky to be alive!
Frank
-----Original Message-----
From: owner-zenith-list-server@matronics.com
[mailto:owner-zenith-list-server@matronics.com] On Behalf Of Garrou, Douglas
Subject: RE: Zenith-List: 12V Heaters
--> Zenith-List message posted by: "Garrou, Douglas"
--> <dgarrou@hunton.com>
Informal, non-scientific, but possibly educational survey:
What is the total number of EA-81 in-flight engine failures we can identify
just among members of this list? I guess I'll count as a failure (a) any
time the engine flat-out quits while flying or (b) any time the engine
starts behaving so badly you have to land for fear of dying.
I guess we start with Frank's 3 to begin with.
Doug G.
-------------------
Time: 03:40:09 AM PST US
From: Andrew SanClemente <ansancle@townisp.com>
Subject: Zenith-List: 12V Heaters
Do all stratus EA-81's need the valve guides
replaced?? I live in the northeast and the chances of surviving 3
engine outs are slim, not many suitable landing fields.
advertising on the Matronics Forums.
Message 11
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| Subject: | Re: inst.panel701 |
--> Zenith-List message posted by: ZSMITH3rd@aol.com
You obviously have the S-t-r-e-t-c-h-e-d 701.
Don't recall exactly the measurement, but mine was off also.
Not to worry. It fits where it fits.
I wore paint off the floor walking around the plane until I got smart and
measured all the surrounding items. When everything else checked okay, I nailed
the instrument panel where it fit best, and went on to other things.
Zed/701/R912/90% do not archive
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