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paul(at)eucleides.com
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 Posted: Wed Nov 26, 2008 10:32 pm Post subject: Elevator Trim question |
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If you build in elevator trim such as Lowell's that is installed in the left or right
half of the elevator, does this induce yaw or roll?
I've planned on doing this since the beginning of the project. I just didn't know
about the clever servo available from Ray Allen. I have a big clumsy cable that came
with the kit as an option that looks like a throttle cable and mounts facing forward
under the left seat. Running a couple of wires would be a lot lighter. I see Aircraft
Spruce sells the three models of the servo and the indicator and control but where do
you get that nifty cover?
Merlin rigged the throttle so you can have it left, center or right or any combination
on my kit. Since I learned with a yoke and center throttle/mixture/propeller controls,
I'll just rig the center location only. It is real easy to add another throttle handle
even after the covering and panel are complete.
--
Paul A. Franz
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
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Dick Maddux
Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl
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| Posted: Thu Nov 27, 2008 6:06 am Post subject: Elevator Trim question |
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Paul, Lowell made that "nifty cover" for the trim servo. As mentioned earlier I have one of his first systems and have installed the trim button on the stick. It is similar to the T-28's I used to fly and sure makes it nice on approach. It was easy to string the wires. I used model airplane servo connectors to connect the wires which worked out well. Here is a picture of the elevator after painting prior to installation.
Dick Maddux
Pensacola,Fl
Finally, one site has it all: your friends, your email, your favorite cid=emlcntaolcom00000006">Try The NEW AOL.com.
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patreilly43(at)hotmail.co
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| Posted: Thu Nov 27, 2008 7:12 am Post subject: Elevator Trim question |
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Dick C Thanks for the picture. Got to have one!
do not archive
Pat Reilly
Mod 3 582 Rebuild
Rockford C IL
From: Catz631(at)aol.com
Date: Thu C 27 Nov 2008 09:05:53 -0500
Subject: Re: Elevator Trim question
To: kitfox-list(at)matronics.com
Paul C Lowell made that "nifty cover" for the trim servo. As mentioned earlier I have one of his first systems and have installed the trim button on the stick. It is similar to the T-28's I used to fly and sure makes it nice on approach. It was easy to string the wires. I used model airplane servo connectors to connect the wires which worked out well. Here is a picture of the elevator after painting prior to installation.
Dick Maddux
Pensacola CFl
Finally C one site has it all: your friends C your email C your favorite cid=emlcntaolcom00000006">Try The NEW AOL.com.
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MichaelGibbs(at)cox.net
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| Posted: Thu Nov 27, 2008 10:10 am Post subject: Elevator Trim question |
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Paul asks:
| Quote: | If you build in elevator trim such as Lowell's that is installed in
the left or right half of the elevator, does this induce yaw or roll?
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Not in any way that's noticeable. This basic design is common on
many light aircraft, including many single engine Cessnas, and is
very effective. Piper went with a stabilator trim tab on the
Cherokee line that is centered on the surface, but I have never been
able to notice any difference in flying either one.
Mike G.
N728KF, Kitfox IV-1200 Speedster
Phoenix, AZ
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JetPilot
Joined: 10 Jan 2006
Posts: 1246
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| Posted: Thu Nov 27, 2008 10:30 am Post subject: Re: Elevator Trim question |
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| paul(at)eucleides.com wrote: |
If you build in elevator trim such as Lowell's that is installed in the left or right
half of the elevator, does this induce yaw or roll?
|
There will be no roll or yaw induced with this trim system. Most airplanes have a trim tab on one half of the elevator only, they fly great with no strange habits due to this.
I have flown with the Ray Allen electric trim system for both elevator and Rudder on a Skyboy, and it works great. You just push the button on the stick for the way you want trim, it will make a new airplane out of your Kitfox ! Ray Allen also sells trim motors with LED position indicators that you can put on your panel, so the Gage always tells you where your trim is for takeoff, etc...
The old trim systems with cables are horrible, never precise, a pain in the neck to adjust, and just plain clunky. The failure mode of a cable is even worse, if the cable gets some slack with age, and a trim tab is allowed some play, the tab is very likely to flutter, which will cause flutter of the elevator which can cause loss of the entire elevator. Many trim cable systems on experimentals are an accident waiting to happen. There have been many accidents like this in many makes of aircraft. Trim tabs are great, but as with anything in aviation, you must use great care to engineer and install it correctly.
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_________________
"NO FEAR" - If you have no fear you did not go as fast as you could have !!!
Kolb MK-III Xtra, 912-S |
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JetPilot
Joined: 10 Jan 2006
Posts: 1246
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| Posted: Thu Nov 27, 2008 10:37 am Post subject: Re: Elevator Trim question |
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P.S.
I don't know what Aircraft Spruce charges for the trim components, but many times they are very expensive, many times not... Last time I bought from them I paid twice what I could have gotten the same item from another source.
Here is the Ray allen Website, they carry everything they make:
http://www.rayallencompany.com/index.html
Mike
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_________________
"NO FEAR" - If you have no fear you did not go as fast as you could have !!!
Kolb MK-III Xtra, 912-S |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Thu Nov 27, 2008 10:51 am Post subject: Elevator Trim question |
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Just for comparison sake....I bought 2 axle nuts (castle type,
1-1/4"x16...MIL specs) for my new skis from Spruce for $10.95 each,
and the very same nut from Grove is $15.50 each. I think that Spruce
sets their price based on how many they sell...pick an odd-ball size
of almost anything, and you'll pay more. At least that's the way I'm
seeing the trend.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, 593hrs
Sensenich 62x46
flying again after rebuild, and new Electroair direct-fire ignition
system;
also building a new pair of snow skis
do not archive
On Nov 27, 2008, at 1:37 PM, JetPilot wrote:
| Quote: |
P.S.
I don't know what Aircraft Spruce charges for the trim components,
but many times they are very expensive, many times not... Last
time I bought from them I paid twice what I could have gotten the
same item from another source.
Here is the Ray allen Website, they carry everything they make:
http://www.rayallencompany.com/index.html
Mike
--------
"NO FEAR" - If you have no fear you did not go as fast
as you could have !!!
Kolb MK-III Xtra, 912-S
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 16547#216547
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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paul(at)eucleides.com
Guest
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| Posted: Thu Nov 27, 2008 1:25 pm Post subject: Elevator Trim question |
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On Thu, November 27, 2008 6:05 am, Catz631(at)aol.com wrote:
| Quote: | Paul, Lowell made that "nifty cover" for the trim servo. As mentioned earlier
I have one of his first systems and have installed the trim button on the
stick. It is similar to the T-28's I used to fly and sure makes it nice on
approach. It was easy to string the wires. I used model airplane servo connectors to
connect the wires which worked out well. Here is a picture of the elevator
after painting prior to installation.
|
How thick is the servo? I think I can get one possibly almost completely under the
fabric on my elevator. I'll have to cut the trailing tube in one section of my
elevator then weld one back in with the hinges for the trim tab.
I'd be interested in having Lowell make the actual trim tab. I'd rather buy the tools
than pay the shipping of my elevator both ways.
--
Paul A. Franz
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
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MichaelGibbs(at)cox.net
Guest
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| Posted: Thu Nov 27, 2008 2:14 pm Post subject: Elevator Trim question |
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Paul asks:
| Quote: | How thick is the servo? I think I can get one possibly almost
completely under the fabric on my elevator.
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I'm not familiar with the unit that Lowell is selling but I got one
from Murle Williams and it fit completely inside the tubing and
fabric. It just had a small protrusion where the rod came out of the
servo assembly.
Mike G.
N728KF, Kitfox IV-1200 Speedster
Phoenix, AZ
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