Center of Gravity
An important part of preparing the aircraft for flight is
properly balancing the model.
Caution: Do not inadvertently skip this step!
The recommended balance point for the PT-17 is
3-1/4 to 3-3/4 inches (82 to 95mm) behind the
leading edge of the upper wing. Mark the range for
the Center of Gravity on the underside of the upper
wing as shown. Interplane strut removed for clarity.
It will be necessary to assemble the model to a
flight ready state in order to check the center of
gravity location.
Parts Required
Assembled model
Propeller
Motor battery
Tools Required
Felt-tipped pen
Ruler
Stick-on lead weight
Ο 1. Install the motor battery.
Ο 3. Use a commercial balancing device or suspend
the model on fingertips within the recommended
center of gravity range to check the balance.
E-flite Stearman PT-17 15e ARF Assembly Manual
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Ο 4. Due to the short nose moment of the Stearman
PT-17, between 2 to 4 ounces of nose weight will
be required. Determine the amount by temporarily
placing it on the dummy engine at the cylinder
location. When the appropriate amount is known,
remove the cowling and attach the weight inside at
the base of the dummy engine cylinders. Form a
curve in the weight prior to installation so that it
conforms to the interior of the cowling and does
not interfere with operation of the motor.
Ο 2. Install the propeller adapter and propeller. The
shaft of a screwdriver or Allen wrench can be used
to tighten the propeller nut.
