Ampflow a28 400 f 77mm 3in diameter high performance motors and gearboxes ampflow a28 400 f24 the ampflow a28 400 f24 is designed to give the highest possible performance from a brushed dc motorusing rare earth neodymium magnets and with a nominal voltage of 24v the motor has a peak power of 43hp making it ideal for high performance heavy duty robotics motorised vehicles and automation applications it is fitted with a fan and is drilled with vent holes to allow flow through cooling w