This was the second design of the B&V P.209. which featured a swept-forward wing.  This was an effort to alleviate compressibility problems of straight wings at high speed, while helping to avoid the instability at low speeds suffered by swept-back wings.  The HeS 011 turbojet, which was fed by a nose intake, powered this fighter.  Three MK 108 30mm Cannons were the projected armament.