Great Planes Ultra Sport 40 Kit - GPMA0410 - Manual (Page 20)

front fuse side so the rear edge lines up with the front of
the wing saddle opening on the plan (the rear edge of F-
2A). Edge glue the lower front fuse side to the fuse side.
NOTE: Use waxed paper under the balsa to avoid gluing
to the plan.
3. Carefully position the lower rear fuse side so
front edge of the fuselage doublers. Note that the spacers
are not the same size. They will automatically set the
engine at the required 2-degrees right thrust.
7. Edge glue the appropriate firewall spacers to the
the vertical front edge lines up with the rear of the wing
saddle opening on the plan (the front edge ofF-4). Edge
glue the lower rear fuse side to the fuse side.
4. Trim off the rear portion of the lower rear fuse
side. making the bottom edge a straight line.
T-bar and 100-grit sandpaper, then repeat the above steps
to make the other fuse side.
6. Find the two die-cut 1/8" ply fuselage doublers
and the four die-cut 1/8" ply firewall spacers. Note that
the spacers are marked "2L", "2R", "4L", and
"4R".
Use the #2 firewall spacers if you will be
installing a 2-cycle engine such as the OS Max 40
SF.
Use the #4 firewall spacers if you will be
installing a small 4-cycle engine, such as the OS FS
48 Surpass.
If you will be installing a larger (longer) 4-cycle
engine, such as the OS FS 70 Surpass, do not use
any firewall spacer on the right side, and use the
1/8" x 1/8" x 3-1/8" hardwood stick as a firewall
spacer on the left side.
8. Carefully position the fuselage doublers on the
fuse sides, making a RIGHT and a LEFT side. The
doubler with the smaller firewall spacer goes on the right
fuselage side... PLAN IT OUT! It is important that the
fuse doubler and fuse side line up along the top edge and
the front of the wing opening. While holding in posi-
tion, apply thin CA glue around all the notches and
lightening holes, then around the edges. Make sure you
apply sufficient glue so it flows under the doubler to
produce a strong bond. NOTE: The narrow and wide
firewall spacers will automatically position the firewall
to result in 2-degrees of right engine thrust.
9. Glue the tapered balsa tail filler to the aft end of
one of the fuse sides and sand it even with the top and
bottom edges.
5. Sand the fuse side smooth on both sides using a
10. From the 1/4" balsa triangle, cut pieces to fit
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