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Task: Mounting the empennage
I noticed two very important problems. The first: When setting
the position of the VS front spar, we didn't take into account
the fact that the rear spar hadn't been drilled and bolted to
the F-712 rear bulkhead. This through the hinge line out of
whack. Secondly, this project started out as an RV-7A, so I
drilled the lower hinge bracket for the tie-down block. Well
the -7 doesn't use that block but instead has AN4 bolts that
go through the hinge bracket, VS rear spar, F-712, and tailwheel
weldment. I'm concerned about edge distance here. The plans
call out 1.125" spacing from center, which is just shy
of the edge distance requirement. If I use a dimension of 1",
I'd be fine. I'm going to call Van's to check.
of business tonight was to drill the lower AN4 bolt hold through
the VS rear spar, F-712 and tailwheel weldment.
Since we had already drilled the F-781 splice plate last night,
I had to fabricate one out of scap 0.63 since the position is
going to be different once the VS rear spar is bolted in place.
I traced, cut, clamped, and match drilled the pattern of holes
that had already been drilled through the VS.
VS rear spar was securly bolted in place, I set the 1/4"
angle of the front of the VS. This helps counteract P-factor.
Then I clamped the F-781/VS front spar to the HS front spar
and verified all the dimensions were still correct. The major
one being the rear hinge line where the rudder mounts. I got
all three perfectly lined up and clamped the VS front spar in
Clamped,. drilled and reamed for AN3 bolts.
Now that the VS is mounted solidly, I had to mount the rudder
on to check or free movement. It swings perfectly!
Here is the custom F-781 bracket I fabricated.
After removing the rudder and VS, I installed the elevators
so we can drill the push-rod attach points.