Measure the throws at the widest part of the
trailing edge of the rudder, ailerons and elevator.
After a few flights you may change the throws to
suit your flight style or the weather conditions.
We recommend the following control surface
throws:
Elevator 1 -1 /8" up and down
Rudder 2" left and right
Ailerons 3/4" up and down
Throttle: Set the throttle so that at "high stick" the
carburetor barrel is fully open and at low stick
with full to half throttle
trim,
the carburetor barrel
is nearly closed. At this position the engine should
run reliably at a low RPM (idle). To shut the engine
off, decrease the throttle trim tab.
(GPMR2400). If the tail drops, shift the receiver
and/or battery pack forward (if possible) to balance
the model. If the nose drops, shift the receiver
and/or battery pack aft. If possible arrange the
battery pack and receiver to achieve balance but
make sure they remain secure in the fuselage so they
cannot shift during flight or a rough landing. If you
must add additional weight to the nose or tail of the
PT-19 to achieve balance use Great Planes adhesive
lead weights (GPMQ4485). An alternate to stick-on
nose weight (if your model is tail heavy) is a Great
Planes brass spinner nut (GPMQ4640). It has
1/4-28 threads so it will fit most engines.
This section is IMPORTANT and must NOT be omitted.
A model that is not properly balanced will be
unstable and possibly unflyable.
1. Check the balance point with all components
installed in the model and the fuel tank empty. Attach
the wing to the fuselage, then accurately mark the
balance point on the top of both wing halves next to
the fuselage. The balance point is shown on the plan
and is 4-3/8" (111 mm) aft of the leading edge.
4-3/8"
2. Lift the model with your fingers at the balance
point or use the Great Planes CG Machine
Balance Your Propellers
Balancing the propeller seems like one of those
things that you can skip, but many problems are the
result of vibration caused by an unbalanced
propeller. Nuts and bolts can vibrate loose and
vibration can damage delicate radio components
inside your receiver and servos. Vibration can even
damage the delicate glow plug element which could
result in an engine that is difficult or impossible to
start. Purchase a Top Flite Precision Magnetic
Balancer™ (TOPQ5700) or a Great Planes fingertip
prop balancer (GPMQ5000) to accurately balance
your propellers.
Charge Your Batteries
Follow the battery charging instructions in the
instruction manual that came with your radio control
system. You should always charge your batteries the
night before you fly.
Ground Check Your Model
Inspect all nuts, screws and wheel collars. Make sure
you install the screw that holds the servo arm onto
the servos and the servo cords are securely
connected to the receiver. If you are not thoroughly
familiar with R/C models, ask an experienced
modeler to inspect your radio installation and make
27
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