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Great Planes ElectriFly 2.5:1 Elec Flight Gearbox GPMG0850

Great Planes ElectriFly 2.5:1 Elec Flight Gearbox GPMG0850
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Item #:GPMG0850

Great Planes ElectriFly 2.5:1 Elec Flight Gearbox GPMG0850

This is a GD-600 Electric Flight 2.5:1 ratio Gear Drive Unit for Electric R/C Airplanes Applications.


  • Great Planes ElectriFly 2.5:1 Elec Flight Gearbox GPMG0850

  • Designed for electric aiplanes using reverse rotation 550-size motors

  • Converts the rotational speed from the motor to the propeller, making the motor more versatile and efficient than a direct drive system. It is capable of delivering more thrust and longer flight times by swinging larger, more efficient propellers.

  • Dual ball bearings and precision machined aluminum prop hub provide true, vibration-free rotation.

  • Open housing for optimum cooling and easy pinion changes

  • Compact, lightweight, and highly durable

  • Extended prop shaft provides plenty of room to hold prop, washer, and nut.

  • Includes a 2.5:1 steel pinion gear for 18-turn motors.(see COMMENTS)

  • One year warranty


  • Weight: 1.4oz (40g)

  • Shaft Diameter: 4.9mm


  • One ElectriFly GD-600 Electric Flight Gear Drive 2.5:1

  • One 2.5:1 (18 tooth) steel pinion gear (GPMG0851)

  • One precision machined aluminum prop hub and washer (GPMG0855)

  • One instruction sheet

  • All mounting hardware and wrenches


  • One ElectriFly T-600R Reverse Rotation Ferrite Motor (GPMG0705) OR a similar 550 size motor.


  • Optional Pinion Gears:

  • GPMG0851 18T for Gear Ratio 2.5:1

  • GPMG0852 15T for Gear Ratio 3.0:1

  • GPMG0853 12T for Gear Ratio 3.8:1

  • Replacement Main Gear: GPMG0854

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