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WATCH: ‘Ultra-Quiet’ Electric Aircraft Engines Power First Piloted Flight

Swift 3 glider with Whisper Aero’s propulsion system begins testing.

Wednesday, August 19, 2026 at 03:30 PM ET

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Whisper used a modified Aériane Swift 3 glider to conduct the first piloted tests of its eQ250 electric ducted fan propulsion system. [Credit: Whisper Aero]

Key Takeaways:

Whisper Aero successfully conducted initial piloted flight tests of its ultra-quiet eQ250 electric ducted fan propulsion system on a modified glider, validating its performance, acoustics, and handling.
The eQ250 system is designed to reduce operational noise by approximately 20 dB compared to similar quiet propulsion systems and offers 20 percent greater efficiency, making it suitable for regional air mobility services from small airports.
This technology is being developed for both civil applications, aiming to enable quiet short-to-medium-range air travel, and defense contracts, including a U.S. Air Force program for quiet, autonomous cargo aircraft, with future plans for advanced STOL/VTOL integrations.

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An electric aircraft engine designed to reduce operational noise to a whisper is now powering piloted aircraft.

Whisper Aero on Wednesday revealed that its “ultra-quiet” eQ250 electric ducted fan propulsion system is being put to the test in Tennessee under an FAA special airworthiness certification. The company said it installed a pair of eQ250s on a modified Aériane Swift 3 glider, with which test pilot Zac Majors conducted three flights spanning 130 minutes, or about 43 minutes on average.

Jack is a staff writer covering advanced air mobility, including everything from drones to unmanned aircraft systems to space travel—and a whole lot more. He spent close to two years reporting on drone delivery for FreightWaves, covering the biggest news and developments in the space and connecting with industry executives and experts. Jack is also a basketball aficionado, a frequent traveler and a lover of all things logistics.