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Composite-ARF Extra 330L (2 x 2m)
techsupport@composite-arf.com
The location of your batteries will depend on your motor choice and where they need to be for
correct C of Gravity. Shown here is a 1400 5-cell pack in the nose for the Hacker set-up.
NB: Please double-check the manual for your R/C system if the use of 5-cell NiCads is recom-
mended, or not.
Switches
When using a gas engine we highly recommend a
'Powerswitch' for the ignition cut-off, which is available
from C-ARF. If fitting the switches into the outside sur-
face of the fuselage, as shown, you should reinforce the
area inside with a small patch of 3mm thick plywood to
reduce vibration transmissions to the switches. The
PowerBox 'Sensor' switch
switches come with paper templates for cutting the slots.
If using a separate Rx battery(ies), instead of a BEC system, we can highly recommend the
Powerbox 'Sensor' switch as used here. This unit incorporates both dual battery inputs and out-
puts to the receiver, as well as a voltage regulator for 5-cell packs which regulates the voltage
to 5.9 volts. You can use this switch with 1 or 2 Nicad packs. An excellent lightweight unit that
is available from Composite-ARF as an option. See website.
No switch is normally used for the Flight batteries if fitting an electric motor, due to the very high
current. Instead use a simple arming system to connect the battery to the speed controller, as
shown in the 'Electric option' section.
Servo extension leads etc.
We advise you to use good quality twisted-cable extension leads, of heavy gauge wire with gold-
contact connectors. Certainly we recommend that all servo leads and extensions longer than
about 30cms (12") are fitted with ceramic chokes (ferrite rings) at the receiver end to prevent RF
noise, within 100mm (4") of the receiver.
Secure all loose wires and extension leads - remember that when you are pulling those 10G
manoeuvres everything in the plane has 10 times more force than usual! Be very careful to fix
your flight batteries/Rx Nicads securely.
A short length of plastic spiral-wrap every 150mm/6" or so over the cables, and a small blob of
'hot glue' works well - and is easy to remove if necessary for maintenance etc. Make extra sure
that no fuel tubes or cables can come in contact with hot exhausts. If using an electric motor with
high current batteries it is extremely important to make sure that no battery wires/connectors can
touch each other, either during battery installation, or flying.
Fuel proofing:
If fitting a gas or glow motor we highly recommend that you protect all the bare wood parts and
edges inside the front of the plane with one thin coat of 24 hr laminating epoxy, or similar,
brushed on. Be careful not to add excess weight here - it only needs about 25 - 30 grams (1 oz.)
of epoxy to fuel proof all the wood in the whole area in the front of the plane.
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