Great Planes Ultra Sport 60 Kit - GPMA0420 Pages 28-48 User Manual
Great Planes Air equipment
backplate to allow for engine movement. (A space of
approximately 1/8" is probably sufficient).
ring. By trial and error, sand a little at a time off the front of
the chin block until it mates at the proper angle with the back
of the spinner ring.
10. Glue the chin block to the bottom of the fuse and the
spinner ring. You may want to use 5-minute epoxy for this
step to allow some time for careful positioning.
11. Cut off and sand the aft end of the chin block flush
with the aft edge of F-2A.
NOTE: If you are building a taildragger, disregard steps
12 and 13.
12. Turn the fuselage right side up and use a long 5/32"
over the spinner ring, and tack glue it to the 1/32" ply spacers.
6. Now center your2-3/4" diameter spinner backplate
7. Slide the spinner ring / spinner backplate assembly
drill bit (or a sharpened piece of 5/32" O.D. brass tube) to drill
a hole in the chin block for the nosegear wire. Insert the drill
through the holes in the engine mount and drill down through
the chin block.
onto the driveshaft and temporarily hold in place with the
prop and prop nut
13. Temporarily install the nose gear, steering arm and
nosegear pushrod wire. Notice that the pushrod wire will bind
against the chin block in a right turn. Carve out a clearance
slot for the nosegear pushrod in the chin block. Now remove
the nosegear parts.
8. Glue together the two halves of the 5/8" balsa chin
block and the 1/2" balsa top front block. Sand the glue joints
smooth with your T-bar. Fuelproof one side of the chin
block.
9. With the fuselage upside down, lay the chin block in
place on the fuse bottom (fuclproofed side toward inside of
fuse). Note how the front of the chin block meets the spinner
14. Lay the top front block in place on top of the
fuselage. Using the same procedure as you used for the chin
block, sand off the front of the top front block to mate with the
spinner ring. Depending on your engine, you may also have
to carve a groove for the needle valve. In addition, check if
your engine mount touches the top front block, and provide
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