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Hi Joe-
I got
bit by that one myself and went through the entire travel adjustment process
before realizing I had done it backwards. If you look at the lower LH side of
the drawing there’s a notation about the top skin, plus directional arrows. They
figured the wing would be upside down at that point- unfortunately mine was
right side up. If you read 8-31 the correct travel limits are spelled out.
Again, note they assume the wing is upside down.
I haven’t attached the wing tips yet- thanks for the tip. I think
because I likely have more potential travel than most I may be able to tweak
things later on to adjust performance. Reflexed ailerons!
BTW, you might try rotating your weight end-for-end. That might
allow the thick part to be cantilevered while keeping the same angle with the
tab. –Bill Wade
Sent: Monday, March 25, 2013 10:11 AM
Subject: [LML] Re: Aileron balancing
Wade, I called Lancair and
asked how I should determine neutral aileron position. They said neutral
is determined from the wing tip or winglet…. Out board in. They also
said the top of the flap may or may not be exactly neutral. Frankly, I
thought that the top of the flap, aileron and winglet should all be at the same
level but it appears –in my case- there is about an 1/8” or so discrepancy
between the top flap and top of neutral aileron. Also the full travel of
the aileron was to be 20 degrees down and 14 degrees up as indicated in the
build manual Figure 8:D:6. What I thought was going to be a simple process
turned out to be quite difficult. Joe Trepicone
From: Lancair Mailing
List [mailto:lml@lancaironline.net] On Behalf Of Bill
Wade
Sent: Saturday, March 23, 2013 6:02 PM
To:
lml@lancaironline.net
Subject: [LML] Re: Aileron
balancing
I did a reality check today and in my situation the Lancair orientation that Joe
pictured worked best. Like others I had tried flipping the weight 180 degrees
(flat side on the aileron tab) because it seemed logical that the mass should be
as far forward as possible. It just didn’t work for me, and the pictures show
why.
The
two photos show the weight clearance near the inboard hinge, RH wing. It wasn’t
easy to take the pictures and the quality isn’t great but the first one shows
that there’s about 1/16” clearance at full UP travel, 20 degrees. What shows is
the carbon tab (with the screw head). The weight surface is parallel to the
pocket interior. If the weight was flipped over or on the bottom of the tab
there wouldn’t be nearly enough travel. The second is harder to make out but I’d
say there’s 1/8”+ clearance, and you can see the tab/ weight relationship
better. The aileron there is at 16 degrees DN, 2 degrees more than required. The
manual doesn’t specify how to align the aileron, at least as far as I could
find, so I decided to set neutral centered on the flap. If others chose to set
the aileron top flush with the top of the flap, that would bias the travel
downward, gaining more clearance in the UP direction and using some of the extra
clearance I have downward. Maybe that’s why I seem to differ from other posters.
How did others set their neutral position?
Perhaps the best way to start would be to try different weight positions, see
what the travel is and look into the pocket to get an idea where and how the
weight is hitting. Then choose the way that looks best and go for it. Just use
the same holes in the aileron tab- unused holes in the weight can easily be
filled with solder. -Bill Wade
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