Aurora Advances to Next Design Phase for DARPA's High-Speed Vertical Takeoff X-Plane

 

Aurora Flight Sciences has completed the conceptual design phase of an innovative vertical-takeoff-and-landing aircraft for the Pentagon's SPRINT program and is now entering the preliminary design stage.

The SPRINT (Speed and Runway Independent Technologies) program aims to develop a vertical takeoff aircraft, also referred to as the X-plane, capable of achieving speeds between 400 and 450 knots. This is significantly faster than the V-22 Osprey, which has a maximum speed of 270 knots. The aircraft must be able to hover stably, transition seamlessly from hovering to forward flight, and feature a distributed energy system that powers all propulsion technology during these transitions.

DARPA has given companies the flexibility to design the aircraft as crewed, uncrewed, or autonomous. In November 2023, DARPA awarded six-month contracts to four companies—Aurora (a Boeing subsidiary), Bell Textron, Northrop Grumman, and Piasecki Aircraft Corp.—to begin their conceptual designs.

On April 30, Aurora received a $25 million contract modification to continue developing its version of the SPRINT aircraft. This significant funding boost follows an initial $4.2 million allocation. Currently, Aurora is the only company to receive further funding to advance in the SPRINT program, but more awards may follow. DARPA plans to eliminate at least one company from the competition after the conceptual design phase.

Aurora’s blended-wing design incorporates three embedded lift fans for vertical flight, transitioning to embedded engines for forward flight. This design reduces drag and allows high-speed travel, making it ideal for air mobility and special operations missions. New concept art from Aurora shows an uncrewed aircraft with a composite exterior capable of cruising at 450 knots. The design is adaptable, with the potential to add more lift fans or create a crewed version if military requirements change.

Aurora aims to complete the preliminary design review within a year and conduct the first flight in three years. Bell Textron, another competitor, is pursuing a tiltrotor design similar to the Osprey.

In addition to the SPRINT project, DARPA awarded Aurora an $8.3 million contract modification to continue developing an experimental heavy cargo seaplane, the Liberty Lifter.