Originally Posted by T-CAT
Your 5400kv motor on the stock 55-56mm XF fan can work fine on 4S, correct? How fast are people going on your 5400kv motor on 4S?
Yes it will. With the 56mm 3 blade rotor expect about 95-100 mph with the exit nozzle reduced to 1.8" diameter. It is not the most efficient setup but it is an easy upgrade. You can fly like stock with 3S then drop a 4S in for extra speed.