Use this motor with 2-3 cell Li-Poly packs and 8-9 inch props on planes up to 28 oz flying weight. Manufacturer recommends a 8 x 4 prop on 3-cells and a 9 x 5 prop on 2-cells. We suggest propping for around 210 watts continuous. The motor features a 4mm hardened steel shaft, dual ball bearings for the shaft and has 3.5mm gold spring male connectors already attached with 3 female connectors included for your speed control. Also includes accessory package with the pictured aluminum radial cross mount set with 6mm prop adapter. Mounting holes are spaced 19mm and 16mm on center and are tapped for 3mm (M3) and 2.6mm (M2.6) screws.