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Check that the clunk will be able to move freely inside the tank without binding or jamming when the stopper
is in place. It must not touch the back of the tank when held vertically.
The tube for the overflow must extend right to the top of the tank, while the filler tube must reach the bottom.
Push short pieces of silicone tubing onto the tubes to achieve this.
Now push the tank stopper over the neck of the fueltank and clamp it in place by tightening the cross-head
screw through the front spreader plate. It is important to tighten the screw to the point where the tank is
completely sealed.
Cut three pieces of silicone fuel tubing and push them onto the tubes where they exit the fuel stopper. Mark
the fuel lines as follows:
clunk pick-up
= fuel feed
tube angled up
= overflow
tube angled down
= filler / drain
Fit the fueltank into the fuselage through the wing saddle, threading the three silicone fuel tubes through the
hole in the nose bulkhead. The tank should rest against the rear of the motor bulkhead.
Screw a strip of plywood across the fuselage sides behind the fueltank, resting against the former, to ensure
that it cannot shift backwards in flight.
Installing the glowplug motor and silencer
These instructions only cover the method of installing the OS MAX FXI motor; however, the procedure is
exactly the same if you are fitting an OS MAX LA 46 or OS MAX 46 AX motor.
Place the glow motor on the motor mount, and check that the mounting lugs rest squarely on the mount
arms. Now slide the motor back (towards the tail) to the point where the needle valve is centred in the notch
prepared for it. With the motor in the correct position, mark the location of the holes for the retaining screws
on the motor mount, using a size of drill which fits snugly through the holes in the mounting flanges. Twist the
drill in your fingers so that it makes a clear mark.
Drill 2.8 mm Ø holes in the motor mount arms to accept the motor retaining screws (3.5 x 25 mm
countersunk screws).
The next step is to screw the glow motor in place, but not before connecting the throttle pushrod to the
carburettor arm.
Attach the silencer to the motor using the retaining screws supplied with it. Mount the propeller and spinner
on the motor.
Connecting the fuel lines
Locate the silicone fuel line attached to the fueltank clunk weight (fuel feed) and connect it to the carburettor
inlet nipple. Connect the overflow line to the pressure nipple on the silencer.
The filler line must be sealed with a sealing nipple, Order No. 140 or 140.1, before every flight.
When filling the fueltank take care not to allow excess fuel to run into the silencer.
Assembling the SKY HERO II
Locate the four holes in the fuselage sides as previously described, and melt away the covering film over
them. Push the wing retainer dowels through the holes.
To connect the aileron servos to the receiver we recommend that you plug a suppressor filter, Order No.
1040, into the appropriate receiver socket (2).
Wrap the receiver battery in foam and push it into the space under the fueltank inside the fuselage. Connect
the aileron servo to the extension lead and fit the wing on the fuselage: use four rubber bands on each side
to secure it. It is important to check the condition of the rubber bands at regular intervals, as they will
eventually perish. Always fit new ones if you are not sure.
Balancing the SKY HERO II
Support the model under both wing roots at a point about 75 - 82 mm aft of the wing leading edge. If the CG
position is correct the model will hang level, with the nose inclined slightly down. If necessary glue lead
ballast to the nose or tail to obtain the correct balance. All the control surfaces must be exactly at centre
when the transmitter trims and sticks are in the neutral position. Be sure to check this before the first flight.
