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<< Lancair Builders' Mail List >>
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In a message dated 10/10/2001 10:12:23 PM Pacific Daylight Time,
lancair.list@olsusa.com writes:
<< When the ailerons and flaps are attached and
set to a neutral position the ailerons look good, but one flap seems to
have a twist >>
I just closed one flap and went to reasonable (but not extreme) lengths to
ensure that the inner corner matched up with the fuselage fillet and the
outer corner matched up with the aileron in trail. This was effected by
clamping a 1/8" thick aluminum angle to the underside of the fuselage fillet
and bracing the outboard end of the angle on the top of a small stepladder so
that the flap trailing edge matched up with the aileron in trail. Those
cleco clamps work well for this. I also clamped a 1/16 inch angle to the top
of the trailiong edge to provide even clamping pressure to the TE joint and
keep it straight. I drove a cleco thru the TE into the lower angle to keep
the top skin from sliding during curing. I braced it like this when I
installed the ribs, hoping that this would remove the twist in the flap (or
more accurately, put a different twist in the flap). That didn't work. When
I closed the flap (bonded on the top skin) I did the same thing, and the flap
is now perfect.
I'd be mildly surprised if you could add the twist you need by jigging it up
and heating it all to 250 F since you'd have to heat it all up at once, but
if it can be done, this is the way to do it. It's definitely worth a try.
By all means, support the trailing edge full length by clamping a straight
edge to both sides of it, and do the same to the front so the hinge line
doesn't warp. I think 1/8 inch aluminum angle, with cleco clamps every 12
inches, should work fine. Brace up the errant corner (in your case, the
inner trailing edge) and weight down the angles only until the opposite
corner is touching the hopefully flat floor. Hold at 250 F for an hour or
two to make sure it's warm evenly thoughout, and don't remove the clamps
until you can touch them for a long time with bare hands (appx 120 F). That
honeycomb and foam will make the wing act like a thermos bottle.
You did put vent holes in the thing, didn't you? It's not called for in the
manual, but they are needed.
By the way. do you think this is why they park those things with the flaps
down? So nobody will notice? ("Oops. I forgot to raise them after landing.
Heh, heh." Yeah, right.) Hell, if it flies straight, that's what I'd
do.....
- Rob Wolf
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LML website: http://www.olsusa.com/mkaye/maillist.html
LML Builders' Bookstore: http://www.buildersbooks.com/lancair
Please send your photos and drawings to marvkaye@olsusa.com.
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