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Step 3: Assemble the Engine Mount:

Although GSRC had intended to have the engine mount blind-nuts pre-mounted, but in order

to provide the assembler with the most engine mounting flexibility we allow the assembler to
decide the engine mount orientation. We will show how to side-mount an engine. We will be
showing an OS-91FS®; however, the procedure will be similar for other engines. Take note and
pre-plan for the mounting and thoroughly consider the implications of the muffler and needle
valve locations.

There is ~ 2° right thrust offset built into the fuselage, make reference

there.

Install Engine Mount Blind-nuts:

Place a washer on one of the engine-mount bolts and have it and a

# 2 phillips screwdriver at hand. Using a piece of tape, make a loop and
stick it to the end of your index finger. Place a blind-nut on the tape as
shown, left. Orient the blind-nut through the fuel tank hole and under
one of the firewall bolt holes. Using the engine-bolt & washer, thread
the bolt into the blind-nut. Tighten with the phillips-head screwdriver to
draw the blind-nut into the back side of the firewall. Repeat this process
for the remaining three engine-mount holes.

Note

that the firewall has been marked with the fuel-tank tubing

information. Refer to the fuel tank assembly step for fuel-tank tubing
(port) orientation. The markings refer to: 1) Muffler or Vent port, 2)
Carburetor port, 3) Fill port (the 3rd filling port is optional)

Temporarily attach the engine mounts using the four engine mount-

ing bolts and washers. Snug it down tight; however, it will be removed
later to drill the engine mounting holes in the engine mount rails.

Locate Engine Position:

With the spinner’s backplate on the engine shaft, clamp the

engine to the mount-rails, as shown. Position the engine so that the
rear edge of the spinner backplate is 5-1/2” from the firewall front
surface. Be sure to measure all the way around the backplate to be
sure the backplate is parallel with the firewall and everything is cen-
tered and “squared-up). With the engine securely fastened, mark the
engine mounting hole on the mount-rails, using a pencil or center
punch.

Drill Engine Mounting Holes:

Center punch the engine mounting hole locations that you marked

above and place in a drill-press vise or bench vise. Drill the engine
mounting holes for the size of bolt recommended by the engine manu-
facturer. Attach the engine mount to the firewall. Do not mount the
engine at this time (For 60 - 120 size engines, use # 6-32 steel bolts
(minimum), and locking nuts on each engine bolt.)

Locate the Engine Mounting Holes:

Locate the Vertical and Horizontal center lines. If they are not vis-

ible, measure and draw them in. The horizontal center line is 3-13/32”
up from the fuselage bottom. Draw two (2) parallel lines, 1-3/16”, one to
the right and left of the

vertical thrust line

which is 3/32”

left* of Vc/l

Add 0.05” (~3/64”) to the engine-rail separation required by your engine,

(See Table 2)

divide this number by two and draw two parallel lines, above

and below, Hc/l. Where the four lines cross, center punch and drill 13/
64” diameter holes for the blind nuts.

(*Right if facing the Firewall)