Top Flite Sierra 40 Trainer Kit - Manual (Page 11)

11
NOTE: At this point you should determine if you
need to use the 9mm x 2" x 2" plywood spacer
plate in your engine installation. Study the
engine installation drawings on the fuse plan
sheet. Short engines such as the OS .40 FP
require the use of this plate. Longer engines
such as the OS .40 SF or 4-cycle engines do not
require the use of this plate.
12. Glue the right and left die-cut 1/8" balsa aft
fuse top pieces together with thin CA. Note the die-
cut "bumps" at the aft end of the aft fuse top. Trim
these off with a straightedge and a sharp knife.
13. Use medium CA to glue the die-cut 1/8"
plywood firewall F-1A (1A) to F-1B (1B). F-1A is
centered on the slightly larger F-1 B. Make sure the
side of F-1A with the punch marks on it remains
visible. (See the photo at step 14).
NOTE: For the following steps, refer to the firewall
cross section drawing on the fuselage plans. At this
point you must know which engine you will use. If you
are using a recommended 2-cycle engine which fits
into the supplied mount, all the punch marks on F-1A
will be drilled to their appropriate size (in the following
steps). If you are using a 4-cycle engine or an engine
that requires a different mount, you will need to
determine the mounting, throttle pushrod exit, steering
pushrod exit, and fuel line exit hole locations for your
installation. (HINT: Use the four standard mount
punch marks on F-1A to help you locate an alternate
mount by drawing an "X" between them to find the
engine centerline). Regardless which engine you are
using, mount it on this centerline.
14. If you are using the supplied mount, drill the
four punch marks in the middle of F-1 with a 5/32"
drill. Use the firewall (F-1) cross-section on the
fuselage plans to positively identify these hole loca-
tions. While you have the 5/32" drill bit out, drill 5/32"
holes through the two punch marks in the die-cut
1/8" ply landing gear plate (LGP).
15. Drill 1/4" fuel line exit holes at the top edge
of F-1. The punch mark locations should be OK for
most engine installations.
16. Drill a 3/16" throttle pushrod hole in F-1 in the
location you determined. A punch mark indicates
the "standard" pushrod exit location.
17. If you are using the tricycle landing gear, drill
a 3/16" pushrod exit hole in F-1 at the appropriate
punch mark location.
18. Drill 3/16" pushrod holes at the punch marks
in die-cut 1/8" plywood formers F-2 (2), F-3 (3), and
F-4 (4). Refer to the cross-sections on the fuselage
plans to confirm the pushrod locations.
the MM40 motor mount on one side of the plate and
mark the four mounting hole locations. Drill the holes
in the spacer plate with a 1/8" drill bit.
19. If you are using the 9mm spacer plate, center
4-40 x 1" Machine Screw No. 4 Flat Washer
20. Gently tap the 4-40 blind nuts into the back
(F-1 B) side of the firewall. Bolt the motor mount (and
the 9mm spacer if required) to the firewall using the
supplied 4-40 x 1" machine screws and #4 wash-
ers. Carefully apply a small drop of thin CA to the