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Aileron bell crank angle

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Flying High

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I want to check the rigging of my S-2A. I assume that the aileron pushrod idler should be at right angle to the front spar when the aileron is neutral.

But, the bell crank appears to have an acute angle between it's arms, about 80degrees. Which way should it positioned with the stick neutral? I assume one arm or the bell crank should be perpendicular or parallel to the spar?

My S2A has the frieze ailerons if it makes a difference.
 

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