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If your a sport boater or top notch racer on a budget, the Feigao motor is the Brushless motor for you! Feigao high performance brushless motors have the rpm and motor efficiency similar to that of Brushless motors like Hacker that are 2 to 4 times higher in Price! This 540XL "Extra Long" Sized Feigao Motor is 75mm in Length. Motor Specs: 6-24 NiMh or 2s to 6s Lipo cells in a medium to large sized mono or hydro. 35.8mm dia x 75mm long 5mm Output Shaft. Use 5mm Couplers. 372 grams Up to 1000 watts of power with proper cooling. 50,000 rpm bearings! Aluminum Purple Anodized Casing 2-Pole Neo Magnets & Compressed Windings. Mounting screw holes are 25mm apart on center. 3mm mounting screws. Water Cooling We suggest using a high quality silicon water jacket or metal water jacket to cool your high performance motor. Recommended RPM: In rc boats we recommend the following Between 23,000 to 26,000 total rpm for sport boats. Between 26,000 to 30,000 total rpm for race boats. Over 30,000 rpm for quick straight line racing.