The Murphy Builders Site

Hello Fred,

I agree with Dick, if you need another end bracket best bet is to make one.
Figure out what thickness of metal it is and order some from Spruce or
maybe
a local scrap yard. If it is the thick service-bulletin bracket that
you're
referring to then you might of course have to find someone to bend the
metal
for you.

I'd like to see an overview picture or two if you could send such to me at
ted@vafm.org please. Maybe that will give me some other idea. My sense
is
that it would be easier and less frustrating to fix it now rather than
letting it bother you in the back of your mind for months/years (at least
that's the way I am).

I would also like to know the relative position of the elevator trailing
edge. You say the tip & hinge points are out but it is really the trailing
edge, i.e. the whole elevator alignment, that will ultimately answer your
question of flying characteristics. It is relatively straight-forward
(note: I didn't say easy) to realign one tip; not easy to change the
orientation of the whole elevator.

Also, more pictures would help to assess the potential for stress/cracking
at that outer hinge bracket point on the h-stab. Of course, the whole
reason for the reinforcing bracket is to help prevent cracking. If you're
out of alignment as much as it appears in the one picture then you're going
to have a whole lot more stress on that set of brackets and rear
spar/tip-rib structure.

Send me a bunch of overview and close up pics and lets scratch our heads a
bit more.

Ted

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Fred
Messinger (fredm)
Sent: Monday, December 28, 2009 1:48 PM
To: rebel-builders@dcsol.com
Subject: [rebel-builders] Moose QB Stabilizer hinge point misalignment.

Hi Guys,

Having mostly finished the elevator on my moose QB, I decided to check out
how it would mate up to the stabilizer. I built a frame from which I could
suspend the stabilizer and attached elevator to the stabilizer.

It turned out that when I aligned (made flush) one of the elevator tips to
the stabilizer, the other elevator tip was out of flush by a full 1/2" at
the forward end and about 1/8" at the aft end or hinge point area. I
posted
a picture in section 101.

After several minutes of noodling and diddling with my 4 dollar Home Depot
laser level, I found the problem. The stabilizer end rib and reinforcement
bracket were installed on one end about 1/8" from where they should have
been.

So..... I figure I have two options. 1) Fix or 2) ignore.

If I ignore, I wonder whether flight characteristics will be affected and
whether structural pieces will be affected over the near term or short
term. (Plus it looks, well...just plain goofy.)

If I fix, I'm thinking I'll want another end bracket from MAM since the new
holes in the bracket will be a only about 1/8" away from the old holes.
What's the fastest way of getting a stabilizer hinge/doubler these days?

I welcome any and all suggestions and comments.

Thanks!
Fred




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