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Tonight, I started the
task I have have been dreading which was to bend the elevator and
trim tabs. I set up the blocks in accordance with Van's limited
instructions. I was able to bend the tabs, however, they look
very amateur. They are not real smooth or extremely straight.
Van's instructions on how to do this S_CK!!!! It is not so
much about what they say, it is what they leave out...
After, what I consider
mediocre results, I ventured onto the web to see if I could find
a better way.
It looks like my frustration
with this is cosmetic only and no one will ever know the difference
at 200 mph at 10,000 ft.

If you look
closely at the picture below, you can see where the trim tab is
not straight from top to bottom especially at the top of the photograph
(top is forward on elevator).

Just a
different angle. Like I say, I believe this to be cosmetic
only.

Part of my
mediocre results was due to the fact that the wood blocks moved
approximately 1/8" which was 4x more movement than I expected
from Van's instructions. Additionally, with the two individual
blocks, they would tend to buckle when they were hit with the rivet
hammer.
In the picture
below, I am using to Quik-Grip clamps with 1" x 3" blocks.
Don't do this!!! Read on and I will tell
you why.
Just another picture
showing all the Quik-Grip clamps I am using. If you look closely,
you will also see some vise grip clamps in there too. I used
all of these Quik-Grip clamps because the elevator would move when
hit with the rivet hammer. Again, don't do this....
Read on...

The picture
below is of the trim tab. These bends look great. I
changed my method here and it worked ALOT BETTER.

Notice that
on the trim tab, I am using a 2" x 4" which is one piece
of wood and a SINGLE C-Clamp. This resulted in excellent bends.

Okay, here
is what I learned from this evolution:
- Start bending with the trim tab. It is a smaller piece
and if you screw it up, it is cheaper to replace. It will
take at least one bend to see how all this is going to work.
- DO NOT, and I repeat, DO NOT use Quik-Clamps
to clamp the elevator and wood blocks. You physically cannot
get enough clamping force to hold the piece when hitting it with
the rivet hammer. If you don't already have some, go and
get some C-Clamps. Use at least two to hold the wood blocks.
I got by with 1 C-Clamp from the picture above, but I was lucky.
Besides, all I had was one C-Clamp.
- DO use double sided sticky tape.
When clamped, that really helps hold the blocks to the aluminum.
You will see what I mean when you go to remove the wood block
from the trim tab after it has been clamped.
- DO NOT use any block of wood smaller (narrower)
than a 2"x4". The wider the block is, the better.
When you hit the tabs with the rivet hammer, it wants to buckle
the blocks. If you have a wider block in the trim tab or
elevator, the less this tendency will be.
- DO use one block of wood if possible.
If you look at the trim tab photo above, I am using one block
of a 2" x 4". I mathematically guesstimated the
angle of the trim tab and ran a band saw blade through the block
at that angle. The band saw blade removed just enough wood
that the trim tab skin could be inserted in that slit. I
then used the C-Clamp to clamp down on it. I put double
sided tape on the outside of the 2" x 4" (bottom side
and inside of the trim tab, obviously, double sided tape could
not be put into the "slit" created by the band saw).
This arrangement did not even budge when struck with the rivet
hammer. Additionally, with the block not cut into two pieces,
it eliminated the tendency of the blocks to "buckle"
when hit with the rivet hammer.
After I was done, I did
a rough fit of the trim tab to the elevator and it appears that
I will have roughly 7 to 8/32" gap between the elevator and
the trim tab. Van's requires a minimum gap of 3/32" of
a gap. I should have the minimum clearance!!!! |