GREAT PLANES EP YAK 55 3D ARF Manuel d'instruction - Page 15
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connection between your battery pack and the
on/off switch with vinyl tape, heat shrink tubing or
special clips suitable for that purpose.
8.
Make sure any servo extension cords you may have
used do not interfere with other systems (servo
arms, pushrods, etc.).
9.
Balance your propeller (and spare propellers).
10. Place your name, address, AMA number and
telephone number on or inside your model.
11. If you wish to photograph your model, do so before
your first flight.
12. Range check your radio when you get to the flying field.
FLYING
The YAK 55 ARF is a great-flying model that flies smoothly
and predictably. The YAK 55 ARF does not, however,
possess the self-recovery characteristics of a primary R/C
trainer and should be flown only by experienced R/C pilots.
CAUTION (THIS APPLIES TO ALL R/C AIRPLANES): If,
while flying, you notice an alarming or unusual sound
such as a low-pitched "buzz," this may indicate control
surface flutter . Flutter occurs when a control surface
(such as an aileron or elevator) or a flying surface (such
as a wing or stab) rapidly vibrates up and down (thus
causing the noise). In extreme cases, if not detected
immediately, flutter can actually cause the control surface
to detach or the flying surface to fail, thus causing loss of
control followed by an impending crash. The best thing to
do when flutter is detected is to slow the model
immediately by reducing power, then land as soon as
safely possible. Identify which surface fluttered (so the
problem may be resolved) by checking all the servo
grommets for deterioration or signs of vibration. Make
certain all pushrod linkages are secure and free of play. If
it fluttered once, under similar circumstances it will
probably flutter again unless the problem is fixed. Some
things which can cause flutter are; Excessive hinge gap;
Not mounting control horns solidly; Poor fit of clevis pin in
horn; Side-play of wire pushrods caused by large bends;
Excessive free play in servo gears; Insecure servo
mounting; and one of the most prevalent causes of flutter;
Flying an over-powered model at excessive speeds.
For the first flight, it is a good idea to have a friend launch the
airplane for you. This allows you to keep your hands on the
radio sticks and correct any trim problems that are present.
Have your friend hold the YAK 55 ARF by the canopy.
Throttle up to full power, and have your friend give the plane
a gentle underhanded toss at about a 30° angle upward.
Since the YAK 55 ARF has a very high thrust to weight ratio,
the plane will accelerate to flying speed almost instantly.
Climb to a comfortable altitude and throttle back to a lower
power setting. This plane flies great at about half-throttle
when in standard forward flight.
For reassurance and to keep an eye on other traffic, it is a good
idea to have an assistant on the flight line with you. Tell him to
remind you to throttle back once the plane gets to a comfortable
altitude. While full throttle is usually desirable for takeoff, most
models fly more smoothly at reduced speeds.
Take it easy with the YAK 55 ARF for the first few flights,
gradually getting acquainted with it as you gain confidence.
Adjust the trims to maintain straight and level flight. After
flying around for a while, and while still at a safe altitude with
plenty of fuel, practice slow flight and execute practice
landing approaches by reducing the throttle to see how the
model handles at slower speeds. Add power to see how she
climbs as well. Continue to fly around, executing various
maneuvers and making mental notes (or having your
assistant write them down) of what trim or C.G. changes
may be required to fine tune the model so it flies the way you
like. Mind your fuel level, but use this first flight to become
familiar with your model before landing.
To initiate a landing approach, lower the throttle while on the
downwind leg. Allow the nose of the model to pitch
downward to gradually bleed off altitude. Continue to lose
altitude, but maintain airspeed by keeping the nose down as
you turn onto the crosswind leg. Make your final turn toward
the landing area (into the wind) keeping the nose down to
maintain airspeed and control. Level the attitude when the
model reaches an altitude of about 10 feet, modulating the
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