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Building the tail is the easiest part of the airplane so it's a good
place to start for a confidence builder. The tail structure's
strength comes from the welded tubing frame with plywood ribs glued in
place to make the tail surfaces aerodynamic. The instructions with
the kit are excellent, like a big model airplane. |
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The first step, shown
here, is to epoxy in the airfoil shaped plywood ribs into the welded
frame. |
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The second step is to install the bearings which hold the elevator
on. The bearing is constructed of a bronze bushing glued into the
elevator and a steel bearing which slides inside the bushing.
Shown here I am press fitting the bronze bushings into the elevator and
attaching it with locktite 680, an industrial locking compound. |
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Ran into my first problem on step three. The steel bearings
for the elevator were not long enough so that when the nuts were
properly torqued, the metal hinge tabs ground on the ends of the bronze
bushings - too much friction. |
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To solve the binding in the elevator hinges, I turned six new
bearings of the proper size on my lathe. From steel bar stock, I
turned to the correct outside diameter then drilled the hold for the AN3
bolt to pass thru, then cut the bearing to length. A lathe is
really a necessity in aircraft construction in my opinion. |
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Rather than leave the ends of the elevator and horizontal stab
unsightly tubing, a nicely rounded tip is formed using styrofoam, epoxy
and micro-balloons. Here it is shown after sanding. |
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The horizontal stabilizer is held in position with two struts, the
attach point needs an access box. To make this box requires
fabricating the sheet aluminum bracket shown, drilling it, and riveting/epoxying
it into position. The diagonal piece in the picture is the strut
going down to the fuselage. |
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Here the horizontal stabilizer is test fit into position.
Next, the vertical stabilizer and rudder get their plywood ribs epoxied
into place just as on the horizontal stabilizer. |
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The electric jackscrew used for the elevator trim is installed.
This was a big job and required some modifications to get it to work
perfectly. |
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Because of concern from others who have built this plane, I
reinforced the motor housing to insure that it would not break from
fatigue. Again, the lathe was indispensable in building the
reinforcement bracket. |
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The up/down trim switch is installed in the control console along
with the trim position indicator |
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Here, all the ribs are installed and I am setting the control
deflections. The maximum up deflection is 39 degrees and the
maximum down
deflection is 20 degrees, setting this precisely is important for the
safe handling of the aircraft. |