installation described here and this motor/mini-pipe set-up,
you should not need any additional ballast in the nose to
obtain the correct ‘Centre of Gravity’ for pattern flying.
Actually the plane shown here, built for these instructions,
actually finished exactly on the nominal Centre of Gravity
with this set-up. If using a heavier motor that then DA-150,
consideration should be given to the position of the Rx bat-
teries early on, as it may be that they will both need to be
installed very close to the models nominal C of G.
We also highly recommend the high-quality PowerBox
powerswitches for the dual batteries, available from C-ARF
as an option, and we also use one of these in the ignition
circuits of all our planes. Remember the high current that
12 digital high power servos can draw during 3D and
Freestyle manoeuvres when making your decision on R/C
equipment.
If fitting the switches into the outside surface of the fuse-
lage, as shown, please reinforce the area inside with a
small patch of 3mm thick plywood to reduce vibration trans-
missions to the switches. The switches come with paper
templates, making it easy to cut the slots in the fuselage
accurately. We fitted the 2 Receiver switches on the right
side, and the single Ignition switch on the left side.
Composite-ARF advise you to keep all the cables between
the motor ignition battery, ignition switch, and high voltage
ignition unit as far away as possible from the receiver and
R/C system.
Servo extension leads etc.
Please make sure that you use good quality twisted-cable
extension leads, of heavy gauge wire with gold-contact
connectors, to all the servos. Certainly we recommend that
all servo leads and extensions longer than about 30cms
(12”) are fitted with ceramic chokes (ferrite rings) to prevent
RF noise, at the receiver end - normally within 100mm (4”)
of the receiver. Of course, if you are using a ‘Powerbox’ this
unit is already fitted with all the ceramic chokes etc, and
comes with the required high-quality switches. Also no ‘Y’
leads are needed, as the powerbox provides 4 inputs for
each channel.
At C-ARF we hard-wire all our servos with twisted cable
leads of the exact length required and Multiplex 6-pin con-
nectors (see photos). For the 2 aileron servos you can use
1 pin for each wire, and if you are using a single elevator
servo for each stab you can gently squeeze pairs of adja-
cent pins together and use a pair of pins for each cable
(see photo below). We glue the female connectors into
small plywood plates in the sides of the fuselage for con-
Composite-ARF SuperXtra 330L
(3.1m span)
30
(above) Receiver is held to bulk-
head on thick foam pad, with 2
rubber bands around 3mm ply-
wood stick glued behind it.
(above) Plywood reinforcement
glued to fuselage for the switch
mounting to absorb vibrations.
(below) Hi-amp sockets fitted into
thin plywood plates for easy con-
nection of stab extension leads.
