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Jon(at)joncroke.com
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 Posted: Fri Jul 25, 2008 10:45 am Post subject: Chris Heintz letter |
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FYI,
There is a NEW letter from Chris Heintz regarding aileron flutter posted at www.zenair.org (open to all readers)
I would like to thank Chris Heintz for this letter, as I think it could be of importance to all CH design builders and CH aircraft owners.
Thanks
Jon
editor
[quote][b]
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n801bh(at)netzero.com
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| Posted: Fri Jul 25, 2008 4:03 pm Post subject: Chris Heintz letter |
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I love Zenith and their product line of kitplanes,,, BUT. The article states to set the cable tension to 75 LBS on the first flight and let the cable loosen. MY guess is at 75 LBS you will rip out all the pulleys and other components linked to the cables. I really can't believe Chris would have said that... Just my humble opinion though,
do not archive
Ben Haas
N801BH
www.haaspowerair.com
-- "Jon Croke" <Jon(at)joncroke.com> wrote:
FYI,
There is a NEW letter from Chris Heintz regarding aileron flutter posted at www.zenair.org (open to all readers)
I would like to thank Chris Heintz for this letter, as I think it could be of importance to all CH design builders and CH aircraft owners.
Thanks
Jon
editor
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zodierocket(at)hsfx.ca
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| Posted: Fri Jul 25, 2008 4:39 pm Post subject: Chris Heintz letter |
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Ben, the 801 flies just fine with 80 lbs, the intent is to ensure that all slack in the cables is released and then adjusted to proper value. I have set the tension of cables for another builder and set them to 40lbs. After the first flight the cables were less then 10lbs. I quickly re-adjusted them back to 35lbs and redid the safety wire and they stayed constant to the first annual. The intent and desire is that during the first flight all chances of flutter or overly loose cables is removed. Chris has told me several times and at our chapter meeting for the RAA to ensure that the cable tension is higher then spec for first flight then backed off to appropriate # and checked often. During the 801’s 25 hrs the last two weeks I checked the cable tension 5 times, the value never changed from setting it to 35lbs, this is not always the case.
Mark Townsend
Can-Zac Aviation Ltd.
president(at)can-zacaviation.com (president(at)can-zacaviation.com)
www.can-zacaviation.com
--
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n801bh(at)netzero.com
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| Posted: Fri Jul 25, 2008 6:00 pm Post subject: Chris Heintz letter |
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The plans call for cable tension to be 25-35 lbs. That is with the front gear off the ground so to get the full measurement. If the gear is settled the cables get real tight real quick when the gear is fully extended
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cscsail(at)gmavt.net
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| Posted: Sat Jul 26, 2008 2:35 am Post subject: Chris Heintz letter |
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I found that I needed to slacken the elevator cables in order to eliminate the tendency for the control stick to constantly push to the left. The cables are just snug and I'm sure much less than: Elevator tension should be about 40 lbs +/- 5
Has anybody else encountered this effect, or do I have something rigged improperly?
Gordon
CH701 912ULS 25hrs
[quote] ---
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NYTerminat(at)aol.com
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| Posted: Sat Jul 26, 2008 4:35 pm Post subject: Chris Heintz letter |
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Gordon,
Ditto for me
Bob Spudis
N701ZX/ 912S/ 160hrs
In a message dated 7/26/2008 6:36:07 A.M. Eastern Daylight Time, cscsail(at)gmavt.net writes:
| Quote: | I found that I needed to slacken the elevator cables in order to eliminate the tendency for the control stick to constantly push to the left. The cables are just snug and I'm sure much less than: Elevator tension should be about 40 lbs +/- 5
Has anybody else encountered this effect, or do I have something rigged improperly?
Gordon
CH701 912ULS 25hrs
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