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Composite-ARF YAK 55SP (3m span)
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. If you are using a 'Powerbox'
this unit is already fitted with all the ceramic chokes. Also
no 'Y' leads are needed, as the powerbox provides multiple
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 photo right). For the 2 aileron servos you can
use 1 pin for each wire, and for the elevators you can gen-
tly squeeze pairs of adjacent pins together and use a pair
of pins for each cable. We glue the female connectors into
small plywood plates in the sides of the fuselage for con-
necting the stabs and ailerons when assembling the plane.
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.
Make sure that any plug/socket servo cable connections
that cannot be easily seen and regularly checked, for
example the servo connections in the wings, are secured
together with tape - or a short length of heatshrink tubing as
shown here. Also tape down any loose cables that could
get trapped or caught in linkages.
Throttle servo
You can install the throttle servo anywhere you chose,
using the milled plywood mount that we supply (photo
right). We mounted it inverted, on the underside of the land-
ing gear support plate, immediately in front of the left car-
bon leg, and this gives a short and straight direct linkage to
the DA-150 carb.
We advise you not to mount it directly on the back of the
firewall, due to higher vibration levels which can quickly 'kill'
the servo. Note that all DA motors need quite a lot of servo
throw to get the full throttle range, so make sure you can fit
a long output arm on the servo.
M3 all-thread, steel clevises and locknuts are included in
the hardware pack to make up your throttle pushrod.
Make up a wire lever so that you can operate the 'Choke'
for starting thru' the baffle in the front of the cowling.
Motor Ignition System
The ignition unit is normally fixed to the motordome, as
techsupport@composite-arf.com
(above) Milled plywood throttle
servo mount can be installed any-
where you chose. Linkage is
included in the hardware pack.
Assemble with thin CA and then
reinforce the joints with 30 minute
epoxy.
(below) Secure the connection
between the motor pick-up and
the ignition plug with heatshrink
tube of a very small cable-tie.
6-pin MPX connectors are used for
extension leads, with one half
mounted in the fuselage sides.
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