Today's Message Index:
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1. 05:13 AM - Re: Re: panel trim (jaybannist@cs.com)
2. 05:39 AM - Re: Re: panel trim (jaybannist@cs.com)
3. 04:02 PM - Re: Re: Aileron bellcrank wear? (Terry Phillips)
Message 1
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Chuck, That is the trim I got from Zenith. - Jay
-----Original Message-----
From: chuck960 <chuckde@roadrunner.com>
Sent: Thu, Jun 24, 2010 10:29 pm
Subject: Zenith601-List: Re: panel trim
Yes that's the trim I'm looking for. Where did it come from?
Thanks for the photo.
Chuck
Message 2
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That is a lever for the parking brake, which I made with ball valves from
Lowes aviation department.
Jay
-----Original Message-----
From: Scotsman <jaroberts@bdo.co.za>
Sent: Fri, Jun 25, 2010 12:16 am
Subject: Zenith601-List: Re: panel trim
Ditto Chuck's comment.
BTW what is the lever arm that extends to the cabin floor...a fuel cut off
or
parking brake?
j
--------
Cell +27 83 675 0815
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=302447#302447
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Message 3
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| Subject: | Re: Aileron bellcrank wear? |
Hi Paul
I do not have personal experience on the 601XL control harmony problem. My
total time in 601XL is a 30 minute flight in the factory demo plane.
I am just reacting to various posts on line that suggest that control
harmony is not good on the 601XL. I think that it is likely that high
friction in the aileron controls were an important factor in the
pre-upgrade design to avoid aileron flutter. Normal design practice is to
eliminate flutter with counterbalanced control surfaces. (If you look at
almost any certificated airplanes with aluminum skinned ailerons, you will
find counterbalances.) If one can count on the aileron counterbalances to
eliminate flutter in the 601XL, then one should be able to replace the
aileron fairleads with pulleys w/o introducing a new risk of aileron
flutter. Since the elevator and rudder are not counterbalanced, I would not
consider replacing the fairleads in those control links.
If you are correct that the high forces for roll control reported for the
601XL are simply due to the geometry and size of the ailerons, then
installing pulleys will not improve the control harmony. However, if
friction in the control links proves to be significant then pulleys might
make a useful difference. I'm a long way from building my fuselage, so my
ultimate decision on this item is not imminent. Some other builders have
replaced the control cables with push-pull rods. I'm very curious if any
one has replaced the aileron fairleads with pulleys.
Terry
At 09:39 PM 6/20/2010 -0700, you wrote:
>Hi Terry,
>
>Before you invest a lot of time and money in changing fairleads to pulleys,
>I think you should consider another aspect of the "Control Harmony" issue.
>
>The Zodiac XL has HUGE ailerons. This means force applied to the control
>stick doesn't require much movement of the ailerons to produce roll torque.
>It also means the ailerons work quite well all the down to stall speed where
>most spam cans lose nearly all control effect. I believe it is the geometry
>and size of the ailerons that makes them feel so stiff in flight rather than
>any drag in the control cables.
>
>Good luck,
>
>Paul
Terry Phillips
ttp44~at~rkymtn.net
Corvallis MT
ZU-601XL/Jab 3300 s .. l .. o .. o .. w build kit - Tail & flaps are done;
Upgrading wings & ailerons per the AMD Safety Directive
http://www.mykitlog.com/N47TP/
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