REFLECTOR: Adjusting wing incidence

[jerry at jlbent.com]

I thnk Scott has the answer.  You really don't have the spar set until you
have the upper strake attached.  You will find that the wing will rotate
quit a lot until you have the strake completed.  That means that you have
to address wing orientation throughout the process of strake building.
Mostly when attaching the upper strake.

Another thing to consider.  The most critical relationship on the airframe
is between the wing incidence and the canard incidence.  The firewall is
not really all that important.  It's easy to shim the motor mount.


Jerry Brainard
Jerry at JLBEnt.com


   	-------Original Message-------
From: Peter Braswell
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Adjusting wing incidence
Sent: Sep 14 '11 7:39am

Scott,
DUH!  That makes total sense and I hadn't thought about this!  I think you
might be right because all this started off "square and level" and has
seemed to change in the last few weeks as everything has settled.  There is
a lot of weight aft, so twisting makes sense.


Thanks Scott!


Peter

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On Wed, Sep 14, 2011 at 8:05 AM, Scott Baker <[LINK:
mailto:scottb33333 at gmail.com] scottb33333 at gmail.com> wrote:


Peter,
With only the lower strake in place, the center section spar will twist
with the unsupported weight of the wings attached.  You many not have a
problem at all.  Be sure to support to the trailing edge of the wings to
relieve stress on the cc spar.
Scott B


----- Original Message -----
FROM: [LINK: mailto:peter.braswell at gmail.com] Peter Braswell
TO: [LINK: mailto:reflector at tvbf.org] Velocity Aircraft Owners and Builders
list
SENT: Wednesday, September 14, 2011 6:56 AM
SUBJECT: REFLECTOR: Adjusting wing incidence

All,
After attaching my lower strake and comparing the angle between the strake
and wing, things didn't look right.


After going back and verifying the right measurements off the spar to get
the strake aligned properly (they were correct) I remeasured the incidence
of the wings.  With the firewall 90 degrees, the right wing was off level
about 1.1 degrees.  The left wing about the same.


Though not a tragedy, I'm puzzled.  This seems like a lot to be off with
the wings bolted directly to the spar.  Is this common?


At any rate, I understand adjustments can be made by shimming out the wing
attach bolts.  I was wondering how folks are doing this?  Washers seem the
most obvious, but maneuvering them in there might be tricky.  Was wondering
if anybody has fabricated a bushing out of aluminum tubing or something
similar to act as a stand-off, whether that's safe and if so, what material
should be used (aluminum, steel, ???) or should I stick with washers?


TIA,
Peter

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WWW.ZULUWORKS.COM

GREAT AVIATION GEAR: [LINK: HTTP://WWW.SKY-GADGETS.COM/]
WWW.SKY-GADGETS.COM
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