RE: hobby king 4.5inch fan
The fan is a knockoff of an EVF and in its 4.5" version is close to an EVF in amp draw. I just use the shroud to convert an old BVM nitro fan to edf. The BVM rotor is 1.5mm too big to fit the shroud so the rotor has to be cut down a little. In combination with a Neu 1527 1.5y motor it is a powerful unit.