The M550 is a 550 can sized motor, sometimes referred to as 540 size, it is ideal for use in small to medium scale model boats running between 6 and 12V. The M550 comes with suppression capacitor fitted to help reduce any nasty glitches or interference effects in your model and has standard pitch mounting holes of 25.0mm, M3. Running at 12V, at maximum efficiency, the M500 will run at around 6000RPM and pull around 1.6Amps. Start up current, depending on prop size, would be around 15Amps.