GREAT PLANES P-51 MUSTANG Instruction Manual - Page 17
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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 EP P-51 Mustang 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 EP P-51 Mustang 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 EP P-51 Mustang 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 battery power, 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.
Launch
Flight
changes may be required to fine tune the model so it flies
the way you like. Mind your battery power, 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
throttle as necessary to maintain your glide path and
airspeed. If you are going to overshoot, smoothly advance
the throttle (always ready on the right rudder to counteract
torque) and climb out to make another attempt. When you're
ready to make your landing and the model is a foot or so off
the deck, cut your throttle and smoothly increase up elevator
until it gently touches down on its belly. Make sure that you
cut your power completely before touchdown, or gearbox
damage may result.
One final note about flying your model: Have a goal or flight
plan in mind for every flight. This can be learning a new
maneuver(s), improving a maneuver(s) you already know, or
learning how the model behaves in certain conditions (such as
on high or low rates). This is not necessarily to improve your
skills (though it is never a bad idea!) , but more importantly so
you do not surprise yourself by impulsively attempting a
maneuver and suddenly finding that you've run out of time,
altitude or airspeed. Every maneuver should be deliberate, not
impulsive. For example, if you're going to do a loop, check your
altitude, mind the wind direction (anticipating rudder
corrections that will be required to maintain heading),
remember to throttle back at the top, and make certain you are
on the desired rates (high/low rates). A flight plan greatly
reduces the chances of crashing your model just because of
poor planning and impulsive moves. Have a ball! But always
stay in control and fly in a safe manner.
GOOD LUCK AND GREAT FLYING!
Fill in and place on or inside your model.
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