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Composite-ARF Yak 55 (2.1m/83")
When sanding areas on the inside of the composite sand-
wich parts to prepare the surface for gluing something
onto it, do NOT sand through the layer of lightweight
glasscloth on the inside foam sandwich. It is only neces-
sary to rough up the surface, with 180/240 grit, and wipe
off any dust with acetone or de-natured alcohol (or similar)
before gluing to make a perfect joint. Of course, you
should always prepare both parts to be joined before glu-
ing for the highest quality joints. Don't use Acetone or
paint 'thinners' for cleaning external, painted, surfaces as
you will damage the paint.
Tip:
For cleaning small (uncured) glue spots or marks off the
painted surfaces you can use old-fashioned liquid cigarette-
lighter fuel, (eg: 'Ronsonol'). This does not damage the
paint, as Acetone and many other solvents will, and this is what we use at the factory.
At Composite-ARF we try our best to offer you a high quality kit, with outstanding value-for-
money, and as complete as possible. However, if you feel that some additional or different hard-
ware should be included, please feel free to let us know. We know that even good things can be
made better ! Email us: feedback@composite-arf.com.
This is a list of the things you may need to get your Composite-ARF YAK 55SP 2.1m (83") into
the air. Some of them are mandatory, some of them can be chosen by you. What we list here
are highly recommended parts, and have been thoroughly tested.
1.
Power servos (min. 5 ). We highly recommend JR 8511/8611's or Futaba S9351's for the
ailerons, elevators & rudder.
2.
3 metal servo output discs (1" or 25mm dia.) for aileron and rudder servos. We strongly
recommend that you use metal discs instead of the standard plastic discs when using hi-
torque digital servos.
3.
2 reinforced plastic or metal servo arms for elevators, length 30mm (1.25")
4.
Throttle servo for gas/methanol motor. Any standard servo will do.
5.
Aluminium Spinner 90 - 100 mm dia (3.5 - 4"), eg: Tru-Turn or Dave Brown.
6.
Main wheels 100mm (4"). Dubro #400TL wheels are recommended.
7.
Engine DA-50, or equivalent. The instructions show this engine, but you could use any
other 50 - 60cc gas engine. Four 65mm long stand-offs are needed for the DA-50.
8.
Muffler, minipipe or tuned pipe if using gas or methanol engine. C-ARF can supply option
al headers, mini-pipes and MTW full-length tuned pipe for the DA-50 (see our website).
9.
High quality servo extension cables, with gold connectors. High quality receiver and igni
tion switches,. etc.
10.
Receiver battery. Two 1200 -1800 mAH NiMH (or Li-Ion/Duralite) packs.
11.
Fuel tank (500 - 700 ml) with gasoline stopper. Dubro #424 tank fits perfectly.
12.
Propeller, to suit motor choice. A carbon 22 x 10 is most suited to the DA-50 in the Yak.
13.
Powerbox Sensor switch, or similar.
Accessories
7
techsupport@composite-arf.com
Lighter fluid is excellent for clean-
ing small marks, clear wax, uncured
glue, or similar off the painted sur-
face of the plane.
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