Buy a 700KV brushless motor for RC boat. It has 42V Max voltage, 7530W Max power and 175A Max amps. A waterproof brushless motor has significantly higher efficiency and performance, which can provide a longer run time for RC boats.
Model: BLDC-SP-056112-10Rotational Speed: 700KVMaximum Current: 175AMaximum Voltage: 42VMaximum Power: 7350W
Length: 112mmDiameter: 56mmWinding Type: DELTANumber of Turns: 4DNo-load Current: 2.2A
Max Seed: 30000KVShaft: 10mmNumber of Rotor Stages: 4Weight: 1040g
Tips: Are brushless motors with lower KV better?
The higher the KV, the greater the resistance. Higher resistance results in a slower motor. This means that the rotational rating is inversely proportional to the amount of electricity produced by the motor. Therefore, motors with lower KV tend to be faster.