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Aaron(at)healthpak.co.nz
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 Posted: Wed Apr 29, 2009 9:10 pm Post subject: XL Cable tension specs - not on my plans! |
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I bought a kit from Zenair back in 1993, which I have now completed and flown 160 hrs in.
On my plans, there was no mention of any specification for cable tensions, when a fellow
XL builder from New Zealand experienced flutter during initial flight testing this is the response
from Zenair.
http://www.zenair.org/nuke/modules.php?name=News&file=article&sid=17
[quote][b]
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Aaron(at)healthpak.co.nz
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| Posted: Wed Apr 29, 2009 10:05 pm Post subject: XL Cable tension specs - not on my plans! |
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correction 2003 not 1993 for the XL kit purchase date
[quote][b]
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jetboy
Joined: 22 Jul 2006
Posts: 233
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| Posted: Wed Apr 29, 2009 11:13 pm Post subject: Re: XL Cable tension specs - not on my plans! |
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Thats interesting I have been asking for the tensions and setup method that is NOT in the plans for my 2003 CH701 kit.
Its not that I have any concerns as I've been around certified aircraft for some time. My aircraft was a pre-rigged CZAW kit and the NZ CAA inspector commented the rudder cables appeared too tight, however I was happy with them and left them under observation, to settle in.
The area that prompted my enquiries was the state of the elevator system, which cannot be rigged for even cable tension in all quadrants of stick travel. There is an offset in the geometry of the control system which tightens the elevator if the stick is moved right. If one were to rig to 20 lbs the stick neutral position would be hard over to the left.
Maybe there is some info in Zenair News for the 701? No information from ZAC or Canzac was forthcoming. I have no problems (that I know about) but dont expect to be the last person told that I have been operating the aircraft incorrectly.
Ralph
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Ralph - CH701 / 2200a |
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JohnDRead(at)aol.com
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| Posted: Thu Apr 30, 2009 6:42 am Post subject: XL Cable tension specs - not on my plans! |
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Hi Ralph;
I had the same question. I spoke to Caleb at the factory. Below is his reply. As you can see he does mention the asymmetry in the elevator system.
Hi John,
I'm not sure where it is located off the top of my head. The rudder cable tension should be 30lbs +/- 5. The elevator should be 20 lbs +/- 5. You will have to play with the elevator tension because if you have too much it will want to pull the stick to one side but you don't want it too loose either.
Caleb Gebhardt
Zenith Aircraft Co.
(573) 581-9000
caleb(at)zenithair.com (caleb(at)zenithair.com)
Technical Support Disclaimer: While we strive to ensure that the advice/information provided through our support is correct, Zenith Aircraft Company does not accept any responsibility for errors or omissions. Any advise or information that Zenith Aircraft Company gives you via any form of communication is not a guarantee that it will correct your problem. It is only offered as assistance to you. Zenith Aircraft Company will not be held responsible for any loss or damage as a result of our advise or information supplied.
John Read
CH701 - Elbert CO - Jabiru 3300
Phone: 303-648-3261
Fax: 303-648-3262
Cell: 719-494-4567
In a message dated 4/30/2009 1:14:51 A.M. Mountain Daylight Time, sanson.r(at)xtra.co.nz writes:
| Quote: | --> Zenith-List message posted by: "jetboy" <sanson.r(at)xtra.co.nz>
Thats interesting I have been asking for the tensions and setup method that is NOT in the plans for my 2003 CH701 kit.
Its not that I have any concerns as I've been around certified aircraft for some time. My aircraft was a pre-rigged CZAW kit and the NZ CAA inspector commented the rudder cables appeared too tight, however I was happy with them and left them under observation, to settle in.
The area that prompted my enquiries was the state of the elevator system, which cannot be rigged for even cable tension in all quadrants of stick travel. There is an offset in the geometry of the control system which tightens the elevator if the stick is moved right. If one were to rig to 20 lbs the stick neutral position would be hard over to the left.
Maybe there is some info in Zenair News for the 701? No information from ZAC or Canzac was forthcoming. I have no problems (that I know about) but dont expect to be the last person told that I have been operating the aircraft incorrectly.
Ralph
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Ralph - CH701 / 2200a
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Jon(at)joncroke.com
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| Posted: Thu Apr 30, 2009 7:12 am Post subject: XL Cable tension specs - not on my plans! |
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Ralph,
Attached is a recent .pdf memo from Zenith regarding the 701 elevator cables
and the required geometry needed to insure consistent tension in all areas
of travel. This article was in a recent Zenair Newsletter - a good source
of many tips and techniques, but I am biased about that opinion!
Jon
701
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Rigging_701_Elevator_Controls.pdf |
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jetboy
Joined: 22 Jul 2006
Posts: 233
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| Posted: Fri May 01, 2009 3:07 pm Post subject: Re: XL Cable tension specs - not on my plans! |
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Thanks Jon thats much appreciated I will check those details shortly, externally I can pullback the elevator down cable by 1/4" with the stick held full up and hard left, but it stops being loose at neutral and tightens with stick full right.
I do hope that there is an amendment to the plans / construction manuals covering this advice both for 600 and STOL series as I have raised the issue many times on the lists
Ralph
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