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Brushless motor Model SeaMonster-3656-1200Kv Rotational Speed 1200Kv (rpm/v) Max Current 100A Power (W) 450W Input Voltage 11.1v- 18.5v Motor Weight 310g Max. Efficiency 98% No Load Current 1A Internal Resistance 39mO Motor Dimensions (Diameter x Length) 43.8mm x 63 mm + 10 mm ( pipe ) Shaft Dimensions (Diameter x Length) 5.0mm x 22mm Input Battery Types NiCd/ Nimh/ Li-po Battery Cooling Type Water Cool Wire Winds 9 Recommend Model RC Model Boat