Great Planes Reactor Biplane .61 GP/EP ARF - GPMA1023 - Manual (Page 17)

17
O.S. .61FX
O.S. FS91 II,
O.S. FS81
O.S. FS91 II PUMP
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6. Before-mounting the engine, drill 3/16" [4.8mm] holes
through the fi rewall at the crossmarks that align with the
carburetor arm on your throttle as indicated in the sketch. If
using a different engine, you may have to mark and drill the
hole in a different location.
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7. Bolt the engine to the engine mount with for 8-32 x 1"
[25.4mm] SHCS and #8 lock washers.
Install the Fuel Tank
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1. Assemble the stopper with the aluminum tubes, fuel
lines and clunks as shown. Bend the long tube so it will be
at the top of the tank and cut the fuel lines so the clunks
cannot contact the back of the tank—otherwise they could get
stuck. Note that one of the lines will be used for fueling and
defueling and the other line will be the pickup line that goes
to the carburetor. The bent tube will be connected to the vent/
pressure line that will go to the pressure tap on the muffl er.
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2. Write “BOTTOM” on either of the two narrower surfaces
of the tank so you will know which way to install it after
installing the stopper assembly. Insert the stopper so the
vent tube will be at the top of the tank, then tighten the screw
to squish the stopper and seal the tank. Shake the tank to
make sure the fuel lines are not too long and the clunks are
able to fl op around. If necessary, remove the stopper and
shorten the lines.
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3. Glue both plywood fuel tank rings to the back of the
fi rewall centered on the opening.
FUEL TANK HOLDER
HOOK RUBBER
BANDS HERE
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4. Install the fuel tank and hold it in place with a couple of
rubber bands hooked around the former where shown in the
sketch. Test-fi t, then glue the plywood fuel tank holder into
position at the back of the tank as shown.