vhimsl(at)roadrunner.com
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 Posted: Mon May 05, 2008 12:09 am Post subject: Flap alignment problems - tip |
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Hello,
If you are encountering alignment problems in mounting you flaps; like an unacceptable gap between wing skin and flap, and or the rolled flap top skin is hitting the flap brace before flap is in trail, I suggest the following:
Inspect the top skin, flap brace, flap hinge intersection and make sure that you have the hinge on the bottom (or where your plans say it should be) with the brace sandwiched between the hinge and the top skin. For some reason, I had sandwiched the hinge between the brace and top skin on my right wing causing the above problems.
I mention this because you most likely won’t catch this when you are measuring to find out what went wrong. This will lead you to the archives where I ‘gleaned’ that the flap prematurely contacting the flap brace is a ‘common problem’ and the fix is to notch the rolled flap top skin. I wonder how many of those ‘common problems’ were the result of a misplaced hinge?
Anyway, the fix is ‘relatively’ simple. Remove the rivets, reposition the hinge to the bottom and rivet back in place. In my case the gap is gone and the flap is in trail when the rolled skin contacts the brace. If not in your case, you will probably need to add a little more ‘roll’ to the flap skin. I used flush rivets where the flap brace steps up on the spar. I also took this opportunity to drill a pin hole in the aileron mounting bracket to facilitate removal and insertion of the flaps when the wing is mounted to the fuselage.
BTW, don’t toss the internal cutouts when you make your templates for the holding the flaps/ailerons in trail. They work great later inside the wing ends for a quick alignment check and also for inserting (or tracing onto 1” foam and inserting those) into the wing tips to give them body while you drill and clecoe..
Regards,
Vince H.
Idaho
RV8 – N8432 (reserved)
The fuselage is at the hanger. I am finishing up wingtips (now that flap problem is solved), submitting FAA paperwork, and emailing the list when I should be in bed.
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