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Composite-ARF Extra 330L (2 x 2m)
techsupport@composite-arf.com
the motor firewall where necessary for the fuel
feed tube from the tank to the carburettor, and
protect it where it passes through the hole using
a rubber grommet or similar. Fix the tubing
securely to the underside of the top of the fuse-
lage to make sure that it cannot come in contact
with the hot exhaust.
Fit the correct stopper to the fuel tank for the fuel
type used. (If using Dubro tank the gasoline
stopper has a small 'O' moulded in the top of it).
We use the excellent 'Tygon' brand of fuel tubing
for all our models. It is totally gasoline and
kerosene-proof, and does not go hard and crack
with age.
Secure the feed tube inside the tank to the clunk with a
small cable tie. If the tube is even a little loose on the brass
tubes though the stopper it will come off at just the wrong
moment and your engine will quit. So solder some small
rings onto both ends of the brass tubing (easily made from
the soft wire of a paperclip wrapped around a small screw-
driver) and secure with a fuel-line clamp or cable-tie. Don't
miss this small detail - it could cost you your plane !
We use the normal 3-tube plumbing system, one from the
clunk to feed the motor, one out of the bottom of the plane
(vent/overflow - leave open) and one at the top for filling
(close for flight).
Throttle servo
Throttle servo mount
Included in the kit is a CNC milled plywood throttle servo
mount, and you can fit this in any suitable position for your
motor set-up. However, we advise you not to mount it
directly on the back of the firewall as engine vibrations can
damage a servo quite quickly. Rather mount it on the fuse-
lage side near the wing spar tube and use a lightweight
'snake' (cable inside a plastic tube) to connect to the carbu-
rettor linkage, securing the outer plastic tube at several
points.
Motor ignition system
The ignition unit can be secured onto the firewall support
plate with 3 cable-ties, on a foam rubber pad to protect from vibrations. At C-ARF we recommend
a 4-cell 1000 - 1200 NiCad for ignition, and we use a Powerswitch for the ignition cut-off. Add a
very small cable tie around the plug/socket connectors from the motor pick-up to the ignition unit
for extra security.
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