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<< Lancair Builders' Mail List >>
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In a message dated 10/13/2001 10:39:08 PM Pacific Daylight Time,
lancair.list@olsusa.com writes:
<< Trimming out the influence of the twist will produce unwanted trim drag >>
Definitely, but how much? One knot?
<< In addition, the roll trim requirements will most likely vary quite a bit
with speed changes>>
I'm not sure I agree with this. If you tried to trim out the rolling moment
with a rudder trim tab, then I would agree with Dan completely, but if you
compensate by adjusting the flap position so that the mean camber line of
both flaps is the same, then you should have a speed-independent solution.
Granted, nobody wants to fly with a warped airplane, and all these trim
compensations are merely covering up the fact that the airplane isn't
arrow-straight. By all means, try to straighten the flap, but don't jump
into a $1000 and three-month effort if your only goal is aerodynamic
perfection. Unless you're trying to win a showplane award, of course, or if
the extra time and money isn't a factor in your case. In that case, go for
it.
I'm not disagreeing that some attempt should be made to straighten the flap.
I don't even have a problem with throwing the flap away and starting over, if
that's what it takes to make you proud of your final result. God knows I
sure focus on the imperfections, and tend to gloss over the coolness and
beauty of the thing. So, if you want to rework the flap, you have my
blessing (though it's not like you need it or anything). But try the simple
approach first. Try forcing it to the shape you want and heating it to make
it stay that way. Let us know if it works. If that doesn't work, cut it
apart and try again.
<< The flaps on my 320 are straight and true, but I park with the flaps full
down to enhance ingress and egress. Maybe I should pull them up to show off.
>>
Sigh. I can tell that I'll have to park with mine up, too, or no one will
believe that I made them straight....
- Rob Wolf
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Please send your photos and drawings to marvkaye@olsusa.com.
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