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FLIGHT NOTES

The Yak-55M EP is a great-flying model that flies smoothly

and predictably. The Yak-55M EP 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.

The Yak-55M EP is easy to fly and does not have any bad

flying traits. It requires only a short distance for takeoff. In

the air, you will notice that it does have some pitch coupling

with rudder. This can be easily mixed out with a computer

radio. We recommend taking off on high rates. Once you feel

comfortable with the high rates, check out what you can do

with the 3D rates.

We do recommend that a flight timer be set up on your

transmitter to avoid a dead stick when the motor battery

dumps and the ESC cuts the power to the motor. Landing

the Yak-55M EP is easy. As the power is reduced for landing,

the speed bleeds off quickly. It may take a couple of landings

to get the feel of how quickly the plane slows down. We found

that the plane lands as if it has flaps.

Have a ball flying the Yak-55M! But, remember to always

stay in control and fly in a safe manner.

GOOD LUCK AND GREAT FLYING!

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