Flying; Fuel Mixture Adjustments; Takeoff - GREAT PLANES P-40 Warhawk Instruction Manual

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11. Secure connections between servo wires and
Y-connectors or servo extensions, and the connection
between your battery pack and the on/off switch with
vinyl tape, heat-shrink tubing or special clips suitable
for that purpose.
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12. Make sure any servo extension cords you may have
used do not interfere with other systems (servo arms,
pushrods, etc.).
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13. Secure the pressure tap (if used) to the muffl er with
high temp RTV silicone, threadlocking compound or
J.B. Weld.
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14. Make sure the fuel lines are connected and are
not kinked.
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15. Balance your propeller (and spare propellers).
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16. Tighten the propeller nut and spinner.
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17. Place your name, address, AMA number and
telephone number on or inside your model.
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18. Cycle your receiver battery pack (if necessary) and
make sure it is fully charged.
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19. If you wish to photograph your model, do so before
your fi rst fl ight.
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20. Range check your radio when you get to the fl ying fi eld.
The P-40 Warhawk ARF is a great-fl ying model that fl ies
smoothly and predictably. The P-40 Warhawk ARF does
not, however, possess the self-recovery characteristics of a
primary R/C trainer and should be fl own only by experienced
R/C pilots.

Fuel Mixture Adjustments

A fully cowled engine may run at a higher temperature than
an un-cowled engine. For this reason, the fuel mixture should
be richened so the engine runs at about 200 rpm below
peak speed. By running the engine slightly rich, you will help
prevent dead-stick landings caused by overheating.

FLYING

CAUTION (THIS APPLIES TO ALL R/C AIRPLANES): If,
while fl ying, you notice an alarming or unusual sound such as
a low-pitched "buzz," this may indicate control surface fl utter.
Flutter occurs when a control surface (such as an aileron or
elevator) or a fl ying surface (such as a wing or stab) rapidly
vibrates up and down (thus causing the noise). In extreme
cases, if not detected immediately, fl utter can actually cause
the control surface to detach or the fl ying surface to fail, thus
causing loss of control followed by an impending crash. The
best thing to do when fl utter is detected is to slow the model
immediately by reducing power, then land as soon as safely
possible. Identify which surface fl uttered (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 fl uttered once, under
similar circumstances it will probably fl utter again unless the
problem is fi xed. Some things which can cause fl utter are;
Excessive hinge gap; Not mounting control horns solidly; Poor
fi t 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
fl utter; Flying an over-powered model at excessive speeds.
Before you get ready to takeoff, see how the model handles
on the ground by doing a few practice runs at low speeds
on the runway. Hold "up" elevator to keep the tail skid on the
ground. If you need to calm your nerves before the maiden
fl ight, shut the engine down and bring the model back into
the pits. Top off the fuel, then check all fasteners and control
linkages for peace of mind.
Remember to takeoff into the wind. When you're ready, point
the model straight down the runway, hold a bit of up elevator to
keep the tail on the ground, then gradually advance the throttle.
As the model gains speed decrease up elevator allowing the
tail to come off the ground. One of the most important things
to remember with a taildragger is to always be ready to apply
right rudder to counteract engine torque. Gain as much speed
as your runway and fl ying site will practically allow before
gently applying up elevator, lifting the model into the air. At
this moment it is likely that you will need to apply more right
rudder to counteract engine torque. Be smooth on the elevator
stick, allowing the model to establish a gentle climb to a safe
altitude before turning into the traffi c pattern.
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Takeoff