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Photo: Whisper Aero

Local aviation company Whisper Aero has conducted a piloted test of its "ultra-quiet" electric engine.

Last year, the company was awarded a $500,000 grant by the Tennessee Department of Economic and Community Development to advance its glider testing and development along with Tennessee Tech University faculty and students. The company has also been contracted by the U.S. Department of Defense to utilize its quiet electric systems to develop autonomous aircraft.