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rans6andrew
Joined: 23 Nov 2008
Posts: 16
Location: Berks, UK
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 Posted: Sun May 03, 2009 12:36 pm Post subject: elevator cables |
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Hi folks,
I was at the airfield, today, doing the final assembly of my new 601UL. I had in my mind the critical cable tension requirements and noticed that the tension in both elevator cables increases as the elevators are pulled up. In fact, when the elevators are full down the cables are actually quite slack.
Is this normal?
The geometry of the stick cable connection points and stick pivot point are fixed by stuff done at the factory (CZAW!) as are the elevator horn cable connection points and elevator hinge line. There doesn't seem to be anything I could have done wrongly when I installed the cables.
Any ideas?
Andrew.
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A good way through building a 601UL with 912UL.
Still flying Rans S6 with 503. |
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Sun May 03, 2009 12:52 pm Post subject: elevator cables |
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Mine do the same thing, I just rigged them so they don't go completely
slack at full forward.
On May 3, 2009, at 4:36 PM, rans6andrew wrote:
| Quote: |
>
Hi folks,
I was at the airfield, today, doing the final assembly of my new
601UL. I had in my mind the critical cable tension requirements and
noticed that the tension in both elevator cables increases as the
elevators are pulled up. In fact, when the elevators are full down
the cables are actually quite slack.
Is this normal?
The geometry of the stick cable connection points and stick pivot
point are fixed by stuff done at the factory (CZAW!) as are the
elevator horn cable connection points and elevator hinge line.
There doesn't seem to be anything I could have done wrongly when I
installed the cables.
|
--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.
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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
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rans6andrew
Joined: 23 Nov 2008
Posts: 16
Location: Berks, UK
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| Posted: Sat May 09, 2009 12:32 pm Post subject: Re: elevator cables |
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mystery solved.
What I have found out, by trial and error, is that the variation in tension is affected by the relative positions of the elevator neutral position and the stick neutral position. Slackening the upper cable, at the stick end, then tightening the lower cable eventually gets to a situation where the cable tension stays virtually constant as the stick is moved.
After I had sorted that out I soldered a plug to the flap motor wiring and tested the feedback indicator. Then I fitted some nutplates to the rudder fairing so that I could remove it easily if I should ever need to have the tailplane off (tailplane is too wide for my garage) and fitted it with stainless bolts.
Just the reg letters to apply, fit the wing panels, wires for fuel gauge senders and connect tank pipe connections and it will be done. Hurrah!
I capped the day by taxiing up and down the airfield (without the wings!) for every ones amusement. Good Game.
Andrew.
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_________________
A good way through building a 601UL with 912UL.
Still flying Rans S6 with 503. |
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Ron Lendon
Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI
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| Posted: Sat May 09, 2009 5:58 pm Post subject: Re: elevator cables |
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| rans6andrew wrote: | mystery solved.
What I have found out, by trial and error, is that the variation in tension is affected by the relative positions of the elevator neutral position and the stick neutral position. Slackening the upper cable, at the stick end, then tightening the lower cable eventually gets to a situation where the cable tension stays virtually constant as the stick is moved.
Andrew. |
Good catch Andrew. To clarify, I believe when the elevator and control stick are in the neutral position the angle of the cables to the stick should be equal.
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_________________
Ron Lendon
WW Corvair with Roy's Garage 5th bearing
CH 601 XLB
N601LT - Flying
http://www.mykitlog.com/rlendon
Corvair Engine Prints:
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