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Composite-ARF SuperXtra 330L (3.1m span)
Making up the proper extension cables and connectors is
only a little work, if you are proficient with a small soldering-
iron, and makes assembly of the model at the airfield very
quick and easy! Once all wires are soldered to the gold-
plated pins, fit a short length of heat-shrink tube over each
one. Finally protect all the connections from vibrations etc
with a nice blob of glue from a hot-glue gun. Job done.
Fuel tank
Shown in these photos is the 1500cc fuel tank (Dubro S-50)
, which is held to the tank base with 3 large cable-ties (see
photo on page 30). Drill a hole in the motor firewall where
necessary for the fuel feed tube from the tank, 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 motordome with a couple of cable-ties or equivalent,
to make sure that it cannot touch 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'
marked on 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, you can be sure it will come off
at just the wrong moment and your engine will quit !
Therefore please solder small rings onto the brass tubing
(easily made from the soft wire of a paperclip wrapped
around a small screwdriver) and also secure with a fuel-line
clamp or cable-tie (see photo). 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) and one at the top for filling (close for flight).
If you want to fit a smoke system the smoke tank can be fit-
ted alongside the fuel tank but you will need to make an
extra platform for it. Follow the manufacturers instructions
for fitting the smoke system.
Motor ignition system
The ignition unit and battery are fixed to the underside of
the motor dome on foam pads, retained with 3 cable ties
each, as shown in the photo here. At C-ARF we recom-
mend a 4-cell 1400 - 1800 NiCad for ignition power, and we
use a Powerswitch for the cut-off.
Add a very small cable tie, or a 'safety clip', around the
cable from the motor pick-up to the ignition unit for extra
security (see photo above).
techsupport@composite-arf.com
6-pin MPX connectors are used for
extension leads, with one half
mounted in the fuselage sides.
Blob of hot-glue over the heat-
shrink protects from vibrations and
gives nice hand-hold!
33
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