Well, my new wind grabbers are installed and are the quietest blades I've ever heard. These blades are the 5th set over a 30 year period of wind generating. Anyway, quiet as they are, I need them to turn much faster at lower wind speeds. I realize that the blades that came with the Whisper were designed for that unit. Unfortunately that style isn't made anymore. I bought it in 1991. Has anyone tried modifying a set of wind grabbers to make them spin faster? I've looked at different designs and was considering slimming the base of each blade narrower and possibly lessening the turbulence they create. I'd really like some advice from anyone that might know if it would work. I sure love watching them turn though,and did I mention they were quiet, to bad they only start producing amps at over 30 mph. Should have had them up when it was blowing 60 mph.