Ampflow a28 400 f 77mm 3in diameter high performance motors and gearboxes ampflow a28 400 f48 the a28 400 f48 is designed to give the highest possible performance from a brushed dc motorusing rare earth neodymium magnets and with a nominal voltage of 48v these motors have a massive peak power of 91hp making them the ultimate choice for heavyweight robotics motorised vehicles and automation applications they are fitted with a fan and are drilled with vent holes to allow flow through co