[Krait]

Greg,

In regards to blade design: Advanced curved blades cleave the air to reduce noise and amps by enabling each blade to seamlessly continue working as the previous blade finishes. Effectively the leading edge of one blade starts working as the root of another blade finishes work and as a result the electrical energy used is up to 30% less, because current draw is level, without the rise and fall of the electrical surges caused by chopping the air with straight fan blades (Kenlowe website)

Cheers