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Tail Rigging
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The first step in
fitting the tail surfaces was to make sure every thing was going to fit.
The horizontal stabilizer (HS) fit pretty well. I did have to trim the
leading edge a little to clear the fuselage sides. The real trick was to
make sure that the bolt holes on the HS would match up with the longerons
and the cross members that are just below the longerons. I had previously
marked the locations of the cross members so it was easy to make sure the
lined up. 6/12/00 |
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The next step was
to make sure the vertical stabilizer (VS) would fit in place. I had to
trim the turtle deck so that I could squeeze the forward attach plate in
front of the HS forward spar. Once I was sure every thing fit I could
clamp them in place and drill them starting with the HS 6/12/00 |
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I was surprised
how well every thing fit. Even though I built the HS and VS over a year
ago before all the plans were finalized. 6/12/00 |
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Here is a look at
the VS kingpost. At this point I have still not bolted or riveted any thing
in place. Once you rivet the lower tail post to the fuselage I don't think
I would be able to the VS on or off. 6/12/00 |
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Here you can see
how close the elevator torque tube comes to the kingpost on the VS. I will
tell you how I dealt with that later. 6/12/00 |
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Here you can see
into the aft-fuselage through the inspection hole. I was having problems
getting the elevator to go to the full down position. The horn was bumping
into the cross member. I had to modify (grind) the horn so that it would
clear the cross member. 6/12/00 |
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You can see here
that I modified the cross member slightly was well. I made most of the
modification to the horn since it is 3/16" 4130 steel and quite strong.
6/12/00 |
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At full up elevator
I also had problems. The back of the horn near the torque tube was rubbing
the VS kingpost and the tip of the horn was bumping against the Y that
connects the upper longerons. 6/12/00 |
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Here you can see
where I reshaped the forward and aft sides of the horn so that it
would clear every thing and still have positive stops at the up and down
limits. 6/12/00 |
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I also had to grind
the horn near the torque tube to clear the kingpost. At full down elevator,
as shown here, it was not a problem. It would only rub near full up elevator.
6/12/00 |
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Here you can see
the where I ground the horn. 6/12/00 |
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Here is a close
up of where I ground the horn. 6/12/00 |
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This is a view of
the left side of the rudder looking forward. I had to round the edge of
the fuselage stop plate slightly to clear the rudder horn. 6/12/00 |
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© 1999-2000 David Koelzer.
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