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Flap drive pin engagement

Subject: Flap drive pin engagement
From: Graham Clarke <gemin@cix.compulink.co.uk>
Date: Mon, 15 Jul 1996 15:08:27
I wonder if others have problems in engaging these when rigging. Before 
the flap root extensions were added it was difficult, with them it is a 
real pain.  I have tried two conditions 1) the self aligning bearing 
lubricated and very free. Then the slightest engagement off-line and it 
moves out of alignment completely.  b) unlubricated and tight. Then it 
won't move into alignment.  

This all originates from the relative shapes of the pin (hemisphere on a 
cylinder), and the socket (straight cylinder). If the pin had a conical 
or paraboloidal) end, it would self align better. It can hardly be 
reshaped in situ, and those who have already had to remove them (when the 
length changed) will not want to do it again ! My only other thought is 
to have a much bigger door than the 1" suggested, so that access is as 
easy as it was before the extensions were added. It could be out of sight 
in the lower surface, or perhaps a cut-out in the top, which would be 
filled by a fuselage mounted plate when the flaps come up. Any other 
ideas ?

gemin



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