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The Air Force and Boeing developed the X-20 Dyna-Soar (Dynamic Soaring) from 1959 to 1962. Intended as a reusable recon and research craft boosted by a Titan rocket, the craft was also envisioned as a hypersonic bomber. Indeed, the X-20 had all the makings of a game-changing platform before it was cancelled in 1963.
Aurora Flight Sciences has been chosen by DARPA to build a full-scale X-plane to demonstrate the viability of active flow control actuators for primary flight control.
The Grumman X-29 is one of the more obscure experimental aircraft in aviation history that failed to make it past the testing phase.
The X-36 had a design that was truly one of a kind and made aviation history in a number of unique ways.
DARPA has selected four firms to design a 500-mph VTOL X-plane. Only one has a relatively proven design.