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Great Planes ElectriFly Gearbox T400 3:1 Ratio BB GPMG0225

Great Planes ElectriFly Gearbox T400 3:1 Ratio BB GPMG0225
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Item #:GPMG0225

Great Planes ElectriFly Gearbox T400 3:1 Ratio BB GPMG0225

This is a T400 Gearbox with 3:1 Gear Ratio and uses Ball Bearings. For use with the Great Planes Park Flyers.


  • Great Planes ElectriFly Gearbox T400 3:1 Ratio BB GPMG0225

  • Designed for low noise and low maintenance, Park Flyer gearboxes used with 400-sized motors get the maximum climbing power and flight time from each mAh. A bronze pinion gear is used for strength and a nylon main gear for quiet, low friction operation.

  • Compatible with APC's light, durable Slo-Flyer Propellers

  • Utilizes smooth-running, long-lasting ball bearings

  • Lightweight, aluminum, open gear case resists damage

  • Aluminum propeller adapter and washer

  • One year warranty


  • Overall Length: 35mm (1.4")(back of gearbox to front of adapter)

  • Overall Height: 37mm (1.5")

  • Overall Width: 32mm (1.2")

  • Mounting Holes On-Center: 16mm (.67")

  • Propeller Adapter Shaft Diameter: 6mm (.24")

  • Propeller Adapter Shaft Length: 9mm (.35")

  • Main Shaft Diameter: 4mm (.16")(the adapter mounts onto this one)


  • One assembled T400 gearbox 3:1 ratio (includes 34 tooth nylon gear)

  • One brass 11 tooth pinion gear (not carried separately)

  • One 3 x 3mm pinion set screw

  • Two 2.4 x 5mm phillips head mounting screws


  • Attaching the gearbox to the motor with a small phillips head screwdriver.

  • Install pinion onto motor shaft with a 1.5mm hex head wrench

  • Installing propeller onto shaft with a medium sized phillips head screwdriver. (Use threadlocking compound to hold screw tight.)

  • Assembly of gearbox/motor unit onto an aircraft


  • For T-400 motor, use GPMG0325.

  • There was some question whether this is really a 3:1 ratio.

  • Not to worry. That is because 34 teeth to 11 teeth equates to 3.09090909 to 1 thus rounded to 3:1

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