General control line discussion > Open Forum

Finding Center on a mounted bellcrank

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Ken Culbertson:
Has anybody come up with a way to measure your bellcrank centering with the plane buttoned up.  I normally mark my leadouts but this time I forgot, and my x-ray machine is in the shop for repairs.  LL~

Ken

John Rist:
Would a fiber optic scope work?   ???

Dennis Toth:
Ken,
You can take one lead and pull full control (up or down which ever gives the short leadout), then mark the position of the end by the leadout guide. Next reverse the control and mark the leadout at the leadout guide. Now you can measure the distance and mark the middle which should get you pretty close to the neutral point.

Best,    DennisT

Ken Culbertson:

--- Quote from: John Rist on October 10, 2024, 11:51:32 AM ---Would a fiber optic scope work?   ???

--- End quote ---
I have thought of that.  Problem is that I have a 5" diamond shaped bellcrank that doesn't have a flat to use as a guide.  I do have a scope somewhere so I may give it a try anyway.  I normally do Dennis's method,  but this crank does not have equal rotation.  I made a note to myself to center it and mark the leadouts before I covered it then I forgot where I put the note! 

Thanks guys - ken

Dave Rigotti:
Level the flap horn. You did do that before you buttoned up right?

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