Whisper Aero
Ultra-quiet electric propulsion spanning defense aircraft and commercial products
The product
Whisper builds scalable eQ electric engines and WhisperDrive propulsion, integrates them through JetFoil, and develops demonstrator aircraft. Programs include an ultra-quiet Group II ISR drone, light and heavy Collaborative Logistics Aircraft concepts, a regional Whisper Jet concept, and the Tone T1 blower.
The thesis
Lower acoustic signature can expand electric propulsion in ISR, logistics, regional aviation, and noise-sensitive equipment. Whisper is also building aerospace-qualified production capability in Tennessee rather than treating propulsion only as research.
How it runs
Designs and manufactures propulsors in Tennessee, performs ground and flight testing from Crossville, integrates propulsion with partner airframes, and develops dual-use products. It also has a Nashville corporate office and is working with Tennessee Tech on a larger facility.
How it earns
Hardware sales, propulsion-integration work, defense research and development contracts, and commercial product sales through Tone. Revenue, aerospace unit pricing, and customer concentration are not public.
Why it wins
A multidisciplinary propulsor and airframe-integration approach optimized for acoustics, efficiency, speed, thrust, and manufacturability, with published scalability from 5 to 500 pounds of thrust and an AS9100D-certified quality system.
Evidence ledger
- website · 2026-04-27
Whisper Aero identifies as a reindustrialization company.
https://www.whisper.aero - Whisper Aero · 2026-09-12
Official performance claims, U.S. manufacturing, and applications.
https://www.whisper.aero/ - Whisper Aero · 2026-09-12
Defense products, integration model, and ISR demonstrator.
https://www.whisper.aero/defense - Whisper Aero · 2026-09-12
CLA variants and Air Force support.
https://www.whisper.aero/news/whisper-aero-announces-jetfoil-tm-enabled-collaborative-logistics-aircraft-for-the-us-department-of-defense - Whisper Aero · 2026-09-12
Quality-system certification.
https://www.whisper.aero/news/whisper-aero-has-officially-achieved-as9100d-and-iso9001-certification - Whisper Aero · 2026-09-12
Current product and program index.
https://www.whisper.aero/news - Whisper Aero · 2026-09-12
Nashville office and Tennessee Tech facility.
https://www.whisper.aero/careers - SBIR.gov · 2026-09-12
Government award and dual-use objective.
https://www.sbir.gov/awards/220363 - Whisper Aero · 2026-09-12
Latest clearly labeled equity round located.
https://www.whisper.aero/news/series-a-press-release - Whisper Aero · 2026-09-12
Official Crossville flight-test facility, headquarters footprint, and propulsion integration details.
https://www.whisper.aero/news/whisper-aero-opens-new-flight-test-center-at-crossville-memorial-airport - U.S. Securities and Exchange Commission · 2026-09-12
Federal filing lists Whisper Aero's Crossville business address and legal entity details.
https://www.sec.gov/Archives/edgar/data/1984798/0001984798-23-000002-index.htm - Whisper Aero · 2026-09-12
Official regional-air-mobility applications, Whisper Jet concept, and aircraft-partner strategy.
https://www.whisper.aero/aviation
Articles, news, and updates
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