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rowlandcarson(at)gmail.co
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 Posted: Thu Apr 05, 2012 10:26 am Post subject: trim link rod fouling sevo bellcrank |
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Just finished filing out the slots in the side of the fuselage moulding for the trim link rod to connect to the trim tab drive pins. I was gradually driving the servo from one end of its travel to the other while filing to ensure the slot is OK for all combinations of stick position and trim setting. I am worried to discover that the fork of the servo actuating rod connected to the end of the trim bellcrank TS03 is contacting the trim link rod TS05 when full up trim and full up elevator are applied simultaneously.
I observed these metics.
Holding the tailplane at full up (about 14 degrees up from the neutral position in-line with the fuselage fairings) and driving the trim servo from neutral towards full up, results in the plastic fork making contact with the trim link rod as soon as the "full up trim" LED lights. If I let it run on, the trim motor slows slightly, sounding a bit distressed (guess how I found this problem!) and the bellcrank mounting trunnions and top of the aft bulkhead start to distort slightly.
Driving the servo to full up trim with the tailplanes full down allows the trim to reach its end stop without distress. Now if the tailplanes are raised towards full up, the servo rod fork makes contact with the link rod at about 11 degrees up from neutral. Trying to move it beyond that causes visible movement of the aft bulkhead where the servo is mounted.
I am attaching a couple of pictures to show the situation with full up trim set - first one (p1040971_small.jpg) shows how it looks with the tailplane TE nearly full up and the second (p1040973_small.jpg) shows it with the tailplane TE full down (rest position, as no mass balance installed yet).
I did check carefully that the servo travel was correct with respect to the damper slot in the bellcrank mounting trunnions, and I used the template for positioning the trunnions according to the manual.
Can anyone advise me what to do about this? I don't think I've ever heard it mentioned before.
in friendship
Rowland
Europa 435 G-RODO
| Rowland Carson ... that's Rowland with a 'w' ...
| <rowlandcarson(at)gmail.com> http://www.rowlandcarson.org.uk
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craigb(at)onthenet.com.au
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| Posted: Sun Apr 08, 2012 12:45 pm Post subject: trim link rod fouling sevo bellcrank |
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Yes I believe i had the same issue you are describing, when you are at
full travel
on both the servo and the elevator, the servo is being pushed up by the
crank.
If that is your issue, mine was resloved by shortening the link rod
just enough
to prevent the issue. I had to trim a couple of mm from each end of the
pieces that
screw onto the threaded rod and shorten the rod by the same amount. It
seemed to do the trick
and it didnt take much to fix it
regards
craig
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