of the fuselage. Small changes in C.G.
will make large changes in control
sensitivity. Adjust elevator throw for
½-inch up/down measured at the
widest part of the control surface. Set
ailerons for ½-inch up/down measured
against the fuselage. Rudder 1-inch
right/left measured at the bottom
corner.
TRIMMING BASIC FLIGHT
The Pro-fly 540 is NOT a
trainer. A true aerobatic
aircraft, it goes only where you
point it and will not recover to
level flight without control input.
If you do not have high
performance experience seek the
help of someone who does.
Line up on the center of the runway
and slowly open the throttle, using the
rudder to maintain directional
control. Once the tail is up apply a
little up elevator and allow the plane
to gently lift off the runway. Keep the
climb angle and turns shallow until
you reach a safe altitude. Reduce the
throttle to about 60% power. With the
airplane flying away from you adjust
the radio aileron trim tab till the wing
stays level. Turn and line up the plane
with the runway. Adjust the elevator
trim till the plane maintains level
flight. Once again with the airplane
flying away from you adjust the
rudder trim till the fuselage tracks
straight {it may be necessary to
correct the aileron trim after this
procedure}. Continue to fly and trim
until the aircraft is tracking well; land
before the battery runs out. Carry a
little power on final approach until
over the end of the runway, then cut
power to 10%, hold the plane just off
the runway till the airspeed bleeds off
and the plane settles on. If the landing
is too long add power go around and
try again, don’t try to force it to the
ground.
Now its time to zero out the trims. To
do this measure the control location,
center the trim tab on the radio and
adjust the servo horn for large
changes, the control clevis for small
changes. For example if after the
flight the rudder is 3/16 inch to the
right, center the radio trim and adjust
the clevis till the rudder once again
measures 3/16 right. By doing this
whenever you fly, setting the radio
trims at center will result in a well-
trimmed plane. Increase the control
travel, as you become more familiar
with the flight characteristics until
loops take about 20 feet and knife
edge can be maintained with 50%
stick deflection. Final roll rate should
be 400-450 degrees per second.
If you have followed the
procedures in this Manual you
will now be rewarded with
one of the finest flying sport
models available. All primary
and advanced aerobatic
maneuvers are at your
fingertips and the aircraft will
perform them with ease.
