DARPA X-76 Moves to Build Phase

Artist’s concept for the SPRINT X-76, a proof-of-concept technology demonstrator that aims to demonstrate technologies and concepts needed for runway-independent, high-speed flight. | Image: DARPA/Colie Wertz

The Defense Advanced Research Projects Agency has designated its SPeed and Runway INdependent Technologies (SPRINT) demonstrator aircraft as the X-76, with construction now set to begin following a completed design review by Bell Textron Inc.

The X-76 is being developed under a joint programme between DARPA and U.S. Special Operations Command. The effort aims to combine the speed of fixed-wing aircraft with the ability of vertical takeoff and landing platforms to operate without runways. The programme seeks to address a long-standing trade-off in military aviation between speed and flexibility.

Following the successful Critical Design Review, the programme will move into manufacturing, integration and ground testing. The aircraft is expected to demonstrate the ability to cruise at speeds exceeding 400 knots while also being able to hover and operate from unprepared surfaces.

“For too long, the runway has been both an enabler and a tether, granting speed but creating a critical vulnerability,” said Commander Ian Higgins, U.S. Navy, serving as the DARPA SPRINT program manager. “With SPRINT, we’re not just building an X-plane; we’re building options. We’re working to deliver the option of surprise, the option of rapid reinforcement, and the option of life-saving speed, anywhere on the globe, without needing any runway.”

Bell was selected for Phase 2 of the programme in 2025 and has now completed the detailed design stage.

“Bell is honoured to receive the X-76 designation and continue the spirit of American innovation honouring the founding of the United States in 1776,” said Jason Hurst, Bell SVP, Engineering. “This is an important milestone as the Bell and DARPA team advances to a historic first in aviation history and fulfil our mission of developing next-generation vertical-lift aircraft.”

Phase 2 will focus on building and testing the demonstrator, followed by a flight test programme planned for early 2028. The programme is intended to inform future aircraft designs that combine high speed with runway-independent operations.