Great Planes ElectroStik EP RxR - GPMA7500 User Manual
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5. Secure the wing by inserting the two 10-24 nylon wing
bolts into the wing and tightening them down as shown.
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6. Now is a good time to test the rotation of the motor
before the prop is installed. Use your radio system and motor 
battery to temporarily power the motor. CAUTION: Though it 
is highly unlikely that the motor will start, stay away from the 
propeller once the batteries have been plugged in. Always 
leave the batteries unplugged unless you are preparing to fl y. 
Assume that whenever the batteries are plugged in that the 
motor and propeller could start at any time.
Install the Propeller
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1. Remove the nut and prop washer from the RimFire
42-50-1000kV motor and push the spinner backplate all the 
way onto the motor shaft. The center hole may be enlarged 
with a prop reamer or drill if necessary. Place the prop on the 
shaft so that it is perpendicular to the screw hole receptacles as 
shown. Finger-tighten the prop nut and washer. Hold the prop 
shaft and tighten the prop nut securely with a prop wrench. 
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2. Attach the spinner cone to the backplate using the two
#4 x 1/2" [12.7mm] screws.
GET THE MODEL READY TO FLY
Install & Connect the Motor Battery
Before you can power the radio system and set up the 
controls, the motor batteries will need to be charged. Charge 
the batteries and then read the following precautions on how 
to connect for fl ying the model.
Check the Control Directions
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1. Switch the transmitter “ON” and make sure the throttle
stick is down to the off position. Connect the motor battery 
to the ESC and center the trims. When you hear the “beep”, 
move the throttle stick to full power and you will hear another 
“beep.” Move the throttle back to the “OFF” position and 
you will hear four “beeps.” CAUTION: This indicates that 
the motor is now armed and when you advance the throttle 
stick, the propeller will begin spinning and thus, propelling 
the plane forward. If it does not, the throttle reversing switch 
may be set incorrectly. Disconnect the motor batteries and 
change the throttle reversing switch. Retry the throttle arming 
procedure. If the prop is turning the wrong direction (no air 
blowing back towards the fuselage), disconnect and switch 
any two of the black wires between the motor and ESC. 
The ESC will remain armed until you disconnect the motor 
battery packs. WARNING! Once the battery is connected 
to the ESC, stay clear of the propeller even if the ESC 
has not been armed.
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2. Make certain that the control surfaces respond in
the correct direction as shown in the diagram. If any of 
the controls respond in the wrong direction, use the servo 
reversing in the transmitter to reverse the servos connected 
to those controls. Be certain the control surfaces have 
remained centered. Adjust them if necessary.