Air Force Invests in Whisper’s Ultraquiet Propulsion Technology

Flight testing of the electric propulsion developer’s contested logistics concepts is expected to begin in 2027.

Jack Daleo

Thursday, May 08, 2025 at 08:00 AM ET

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Jack Daleo

Whisper Aero is developing two Collaborative Logistics Aircraft (CLA), one with a 500-pound payload and another capable of carrying up to 3,000 pounds. [Courtesy: Whisper Aero]

Key Takeaways:

Whisper Aero is partnering with the U.S. Air Force to develop a new family of quiet, efficient, and autonomous Collaborative Logistics Aircraft (CLA) for contested logistics operations.
The CLA concepts, including Light (500 lbs cargo) and Heavy (3,000 lbs cargo) variants, utilize Whisper's proprietary electric ducted fan (eQ engine) technology, enabling operation from austere or degraded runways with short takeoff and landing capabilities.
These aircraft are designed to be more affordable and attritable, addressing the Air Force's need for greater fuel efficiency, runway flexibility, and reduced acoustic/heat signatures, with initial flight testing for the CLA Light scheduled for 2027.

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Electric propulsion developer Whisper Aero is working with the U.S. Air Force to develop a new family of quiet, efficient, autonomous aircraft for contested logistics, with initial flight testing scheduled for 2027.

Whisper on Tuesday pulled back the curtain on a pair of Collaborative Logistics Aircraft (CLA) concepts, designed to carry 500 pounds (CLA Light) or up to 3,000 pounds (CLA Heavy) of cargo while operating from austere or degraded runways. The effort is backed by Strategic Finance Increase (STRATFI) and Operational Energy Capabilities Improvement Fund (OECIF) contracts. Whisper said autonomy and manufacturing partners will be announced soon.