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Cruising World Noise Measurements
TurbinesRotorSweptRatedSPL*
TestedDia.AreaPower@11 knots
mm2WdBA
Rutland 9130.910.657075
Ampair 1000.920.665078
Air 4031.171.08400102
Windbugger1.271.2718080
Fourwinds II1.521.8124083
* 8 ft (2.4 m) from hub, 11 knots= ~13 mph, ~5.5 m/s
Source: Ed Sherman, New England Institute of Technology; in Cruising World, October, 1999

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