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What is the efficiency (from lowest to highest speed)?

efficiency Highest lowest speed
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What is the efficiency (from lowest to highest speed)?

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At a 5kW load, the Blackbird™ requires approximately 8.5 horsepower at 3,000 rpm which corresponds to a system efficiency in the 80-85% range. This same efficiency is attained at 12 horsepower for 7kW output. Additional windage load develops at higher rpm.

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