Type Single seat fighter with ejection seat and pressure chamber
Engine 2 Daimler-Benz DB 603G with 3,5 m dia. tractor and 3,3 dia. pusher propellers
Dimensions Length  13,70 m, height 5,0 m ,  span 18,00 m , wing area  45,5 m2 , aspect ratio 7,1
Weights Empty , loaded 9100 kg , max. take off weight  
Performance Max.. speed 835 km/h at 8700 m, 600 km/h at sea level , cruising speed  , range , endurance  , service ceiling  14000 - 16000 m , climb
Armament 1 30 mm MK 103 in the propeller hub, 2 20 mm MG 151 above the nose engine
On January 16, 1943, an order was issued at the Dornier plant to produce the Do 335. But there was a danger that this aircraft, intended as a high-speed bomber, would fall victim to a change in strategy and tactics. In order to eliminate this possibility, the Dornier company began to look for an additional field of application for this machine. When the design was finally approved after the "final inspection of the mock-up" on April 18, 1943, the design department developed the so-called "P273 proposal" for a detailed discussion of the use of the aircraft as a high-altitude fighter. The difference between this project and the Do 335 was the distinctly enlarged wing consoles, especially in relation to the original prototype of the aircraft.
The project was continued in 1944 as a variant of the B-4 Do 335 as a high-altitude heavy fighter, but work was eventually discontinued in favor of the less expensive Focke-Wulfa 152.