Composite-ARF Yak 55
(2.1m/83”)
4
Make sure that the plane is secured properly
when you start up the engine. Have a helper hold
your plane from the tail end, or from behind the
wing tips, before you start the engine. Make sure
that all spectators are behind, or far in front, of the
aircraft when running up the engine.
Make sure that you range check your R/C system
thoroughly before the 1st flight. It is absolutely
necessary to range check your complete R/C
installation first WITHOUT the engine running.
Leave the transmitter antenna retracted, and
check the distance you can walk before ‘fail-safe’
occurs. Then start up the engine, run it at about
half throttle and repeat this range check with the engine running. Make sure that there is no
range reduction before ‘fail-safe’ occurs. Only then make the 1st flight. If the range with engine
running is less then with the engine off, please contact the radio supplier/engine manufacturer
and DON’T FLY at that time.
Check for vibrations through the whole throttle range. The engine should run smoothly with no
unusual vibration. If you think that there are any excessive vibrations at any engine rpm’s, DON’T
FLY at this time and check your engine, spinner and propeller for proper balancing. The light-
weight sandwich composite parts don’t like too much vibration and they can suffer damage. The
low mass of all the parts results in a low physical inertia, and any excess vibrations can affect
the servos and linkages.
General Information about
fully-composite aircraft structure
All the parts are produced in negative molds, manufactured using vacuum-bagged sandwich
construction technology. All parts are painted in the molds, either single color or designer
schemes. A production method called TAVS (Total Area Vacuum Sandwich), enables us to pres-
ent this aircraft with incredible built-in strength, while still being lightweight, and for a price that
nobody could even consider some years ago. This production process has huge advantages, but
a few disadvantages also. These facts need to be explained in advance for your understanding.
Description of Parts
The Wings:
The wings are made in negative moulds, fully vacuum bagged, using only 2 layers of 2 oz. cloth
in combination with a very hard 2 mm foam sandwich to form a hard and durable outer skin.
The ailerons are elastic-hinged already for you - laminated
in the mould and attached to the wing with a special nylon
hinge-cloth, sandwiched between the outer skin and the
foam. This nylon hinge is 100% safe and durable. You will
never have to worry about breaking it, or wearing it out.
There is no gap at all on the top wing surface, and there is
a very narrow slot in the bottom surface, where the aileron
slides under the main wing skin during down throw. This
means that the hinge axis line is on the
top
surface of the
NO !!!
NO
NO
DANGER ZONES
Secure the plane
before starting
the engine.
