GREAT PLANES Gee Bee Manuel d'instruction - Page 14
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FLYING
The Gee Bee EP Rx-R is a great-fl ying model that fl ies smoothly
and predictably. The Gee Bee EP Rx-R 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.
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 pushrod 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 wheel on the
ground. If necessary, adjust the tail wheel so the model will roll
straight down the runway. The Gee Bee is very short coupled
and can require a lot of rudder throw, especially when taking
off in a cross wind. If you need to calm your nerves before
the maiden fl ight, bring the model back into the pits. Top off
the battery and check all fasteners and control linkages for
peace of mind. We recommend setting a timer to limit the
fl ight time and avoid a dead stick landing. Start with the timer
set for 5-minutes. This should allow for a couple of landing
attempts before the power starts to drop off.
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 to maintain tail wheel steering,
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 tail dragger is to always be ready to apply right rudder to
counteract motor 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
Takeoff
that you will need to apply more right rudder to counteract
motor 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.
For reassurance and to keep an eye on other traffi c, it is a
good idea to have an assistant on the fl ight 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 fl y more smoothly at reduced speeds.
Take it easy with the Gee Bee EP Rx-R for the fi rst few fl ights,
gradually getting acquainted with it as you gain confi dence.
Adjust the trims to maintain straight and level fl ight. The Gee
Bee is a racing style plane but is capable of performing many
basic sport plane maneuvers. After fl ying around for a while,
and while still at a safe altitude with plenty of battery power
remaining, practice slow fl ight 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 fl y 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 fi ne tune the model so it fl ies the way you like. Mind your
fl ight time, but use this fi rst fl ight 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 fi nal turn toward the runway
(into the wind) keeping the nose down to maintain airspeed
and control. The Gee Bee loses speed quickly, so adjust the
throttle to keep the speed up. Level the attitude when the
model reaches the runway threshold, 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 fl are and the model is a foot or so off the deck,
smoothly increase up elevator until it gently touches down.
Once the model is on the runway and has lost fl ying speed,
hold up elevator to place the tail on the ground, regaining tail
wheel control.
After the fl ight you can continue to run the motor until the ESC
cut-off stops the motor. This additional time can be added to
the 5-minutes on your timer. Remember to leave enough time
for a couple attempts at landing. You do not want the power to
drop just as you power up to go around for a second landing
attempt.
One fi nal note about fl ying your model. Have a goal or fl ight
plan in mind for every fl ight. This can be learning a new
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