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aerosiam
Joined: 26 May 2008
Posts: 59
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 Posted: Mon Jul 14, 2008 5:17 pm Post subject: Stiff ailerons |
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Our aircraft came with stiff ailerons. We traced the problem to a shaft misaligned in a nylon bushing (the red shaft that attaches to the bellcrank in the top of the cabin.) We drilled out the bearing slightly and on the ground, the ailerons now feel loose and normal.
However in the air, they have a 'break-out' force. If the pilot applies a positive movement of a few inches to roll, it is ok. But if he tries to make small normal corrections in flight of half an inch, there is considerable resistance. I will try a spring gauge next time I fly, but I'm guessing that it takes a 4 pound force before the stick will move off center. It is tiring and irritating to fly.
Does anyone have the same problem or have an idea what might be causing it?
One possibility is that the fuselage cage bends slightly in flight and still pinches the shaft which was originally misaligned. Maybe we need to ream out the nylon bushing more but without comparing to another aircraft, it is difficult to assess.
Regards
Paul
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hgmckay
Joined: 23 May 2006
Posts: 397
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| Posted: Mon Jul 14, 2008 6:15 pm Post subject: Stiff ailerons |
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Paul:
Since my Allegro is an E-LSA (I built it from the Q-Build Kit), I can tell
you that I had to ream the nylon bushing to get the shaft that passes
through it to turn smoothly. This was due to a "tight fit" rather than
misalignment. However, in your case if the shaft is still misaligned, you
may have to do more than just "drilling out the bushing". If you know the
problem is a shaft misalignment, can you correct the misalignment itself? I
would try to do that first before I did any more "drilling". I don't know
how this affects your SLSA status.
Hugh McKay
Allegro 2000
Rotax 912 UL
N661WW
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aerosiam
Joined: 26 May 2008
Posts: 59
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| Posted: Thu Jul 24, 2008 7:16 am Post subject: Re: Stiff ailerons |
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Hugh
We reamed out the nylon bushings again until the shaft was slightly loose in the bushing and that has cured the problem.
I recall we had the same problem with the rudder being too stiff. The collar to which the compression strut is attached was butted too tightly against the suspension collar. We removed and machined the top of the collar and now the rudder turns freely.
Regards
Paul
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hgmckay
Joined: 23 May 2006
Posts: 397
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| Posted: Thu Jul 24, 2008 5:13 pm Post subject: Stiff ailerons |
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Paul:
I had the same rudder problem as you.
Hugh
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