The 300DF is a light motor, designed to fly park flyers. Use the 300DF with a 3:1 or gearbox and large prop 8x4, or a speed demon on a 5x3 inch or smaller prop. 2 cell Lipo or 3 cell Lipo can be used with all this motor, but best performance can be achieved by using 3 cells+4.5:1 gear ratio with 12X6, or 11X7 or 11X4.7 props. The data for other props and gears:

For 3.4:1 gearing use 11x7 HD, 11x4.7 SF

For 4.5:1 gearing use 12x6, 11X4.7, 11X7 SF

300DF pusher props have proven to be spectacular. It has been flown with Wing Warrior Zaggis, Wattage HyperWing and Edge RC delta wing planes. Using a small prop direct drive and wings around 16 Oz weight, this is the best you can get at this price. With a 5x4 prop it draws about 12 amps. It is equally good with large props in a gearbox. So decide whether you want speed - 50+ MPH or slow fly with large props and a lot of torque and use this motor for both.