TP 4070 Motor, measures 40mm x 107mm Special while supplies last! Water Jacket included with TP Motor Purchase!)40mm Diameter by 100mm Long Brushless Motor. Hand-wound for high efficiency of up to 90%. Comes with high-quality bearings and neodymium magnets for high power: large vented front and rear end bells for additional heat dissipation.V1 Motors are the Newest design, a three-piece can design with front and back end plates screwed on.Specs:Magnets: neodymiumWatts continuous: 3850Watts max: 7600 Max RPM: 50,000Poles: 4Motor Shaft: 5mm or 8mm, with a flat spotCan Measures: 40mm diameter x 107mm longApprox weight (varies with wind choice): 550 GramsMounting screw diameter required: 3mm REQUIRES:Bullet connectors. We suggest OSE 5.5, 6.0 Bullets, Qs6, or Qs8 connectors.OSE suggests 20,000-35,000 total rpm for boats. We recommend that most Fast Electric Boaters run in the 25,000 RPM range for Sport Boating or the 30,000 RPM range for racing. These are only guidelines; if you do not know how to pick the correct motor, please consult other members of the RC fast electric boating community or us first, either at a local club or on our OSE Forums. *Notes: length and weight will vary with the selected wind.