17
stopper and seal the stopper in the tank. Do not over tighten
the screw as it can cause the tank to split. Attach three 6-
inch lengths of silicone fuel tubing (not furnished) to the tank
and label them appropriately as FILL, CARB, and VENT so you
can identify them after the tank is installed in the airplane.
❑
35) Install the Fuel Tank in the fuselage.
a)
First trial fit the tank in place inside the fuselage to familiarize
yourself with how it mounts. The front of the tank should fit
through the hole in the firewall.
b)
Install the two Zip-ties through the forward slots in the tray
inside the fuselage.
c)
Apply a generous bead of "silicone sealer" around the neck of
the fuel tank (household bathroom silicone sealer is available at
most hardware stores - not furnished).
d)
Then slide the fuel tank in place, up against the back of the
firewall, with the neck of the tank in the hole in the firewall. If
excess silicone sealer oozes out onto the front of the firewall,
clean it off. Tighten the two Zip-ties around the tank, and glue
the balsa retaining block behind the tank.
❑
36) Bolt the two Nylon Engine Mounts on the front of the firewall,
using M4 x 20mm Bolts and M4 Flat Washers provided. Note
that the blind nuts are already installed in the back of the
firewall. Leave the mounting bolts slightly loose for now. Do
not tighten them until the next step.
❑
37) Set your engine in place on the beams of the engine mounts.
Slide the engine forward or aft on the engine mounts until the
front of the engine's thrust washer is 5-3/8" from the front of
the firewall. Double check to make sure that the engine is
pointing exactly straight forward, and then carefully mark the
locations of the engine mounting holes on to the beams of the
engine mounts.
While the engine is in place, mark the throttle pushrod location
on the firewall. This can be easily done by lining a pencil up with
the throttle arm on the carburetor and marking the firewall.
❑
38) Set your engine aside and unbolt the engine mounts from the
firewall. Drill clearance holes for your engine mounting bolts all
the way thru the engine mount beams at the four locations you
marked in the previous step. We recommend that you secure
the engine mounts in a vise while you drill the holes. Also, if at
all possible, use a drill press to drill these holes. You can drill
them by hand, but if you have access to a drill press, the job will
be much easier and the holes will be straighter.
SAFETY ISSUE: Do not drill and tap these engine mounts.
Doing so may weaken them and cause failure. Use steel
mounting bolts, flat washers, and nylon insert lock nuts (not
provided), with holes in the mounts big enough to freely pass the
bolts.
❑
39) Drill an 11/64” hole in the firewall at the position you marked
for the throttle pushrod.
❑
40) Bolt the entire engine and engine mount assembly in position
on the firewall. Tighten all bolts firmly. We suggest using a little
thread locking compound (not supplied) on all the bolt threads
to keep them firmly in place.
❑
41) Connect the fuel tank to the engine using heat-proof silicone
based fuel line tubing (not supplied).
FILLING THE FUEL TANK
To fill the fuel tank when the 3rd line is capped shut, first remove
the other two fuel lines from the carburetor and the muffler
pressure fitting. Pump the fuel into the tank through the fuel pick-
up line (carb line). When the tank is full, fuel will begin to run out
the vent line (muffler line). Stop pumping when you see the fuel
start to come out the vent line! Re-connect the fuel lines and you
are ready to start the engine.
❑
42) When using a glow engine it is best to seal the battery hatch to
keep exhaust and fuel residue out of the fuselage. The reason
we built a hatch into this airplane was to provide access to the
battery compartment when using an electric motor. Obviously,
Summary of Contents for Rascal 80 eg
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