Composite-ARF SPARK Instruction Manual page 32

Composite-ARF SPARK
vent any possible interference.
Fit your receiver and switch to the plate as
shown, with a small foam pad under the Rx, and
make cutouts to save as much weight as possi-
ble. Installed here is the Powerbox Digi-switch,
which is an ic-controlled electronic switch (which
fails 'ON') that has a built-in linear voltage regu-
lator (to 5.5 volts) designed specially for use with
2 cell (7.4volt) Lipo batteries for the receiver.
The single LED glows in 4 different colors and
sequences to indicate the status, including a low
battery warning, and is highly recommended. It
is available from C-ARF as an option (Product #
960610)
Glue the 2 small plywood tabs into the milled
slots in the top of the battery support bulkhead
with epoxy. Fit the Rx plate into the slot in the
front bulkhead, and insert into the fuselage a
shown. With the fuselage upside down, reach
thru' the nose wheel opening and tack glue the
bulkhead to the nose, and then remove the Rx
plate and reinforce the joint with a little 30
minute epoxy and micro-balloons. Reinstall the
RX plate and drill the two Ø 3mm holes through
the rear tabs. Open the holes in the plywood
tabs on the battery bulkhead up to Ø 4.5mm and
insert the T-nuts with a little 5 minute epoxy.
Reinstall the Rx plate and bolt into position,
using the M3 bolts and washers to set perfect
alignment of the T-nuts before the epoxy cures.
RX Antenna
The location of the RX antenna is your choice,
but in any case a very careful range check must
be carried out before flying your Spark, both with
the motor running and off. Electric models are
always more critical in this respect, and it is most
important to keep the antenna as far away from
the motor and speed-controller as possible.
If using a 'normal frequency' receiver (eg:
35MHz or 72Mhz), with a full-length wire anten-
na, we strongly recommend that it is installed in
a 'L-shape' and kept as far away from any pos-
sible RF or EMI interference by installing part of
it in the leading edge of the wing. On our proto-
types we cut the antenna, and soldered on
miniature gold connectors at the junction where
it enters the wing. We ran the antenna along the
side of the fuselage (opposite side from all the
techsupport@composite-arf.com
(above) Receiver and Switch plate installation
is easy and neat using the milled liteply parts.
(below) The Rx antenna was cut at the wing
seat, had a small gold connector soldered to
it, and is connected to the remainder in a
tube in the wing leading edge when assem-
bling the plane at the field.
32