The Yokosuka R2Y Keiun ("Beautiful Cloud") was designed to be long-range high-speed land-based reconnaissance aircraft whose superior speed would hopefully prevent its interception by enemy fighters. A project with the designation R1Y1 Seiun (“Blue Cloud”) was started and resulted in a design similar to the P1Y1 Ginga bomber, but as calculated performance fell short of meeting requirements, the project had to be abandoned. A new design was started in 1943, and was designated the R2Y1. The R2Y borrowed from the German pre-war Heinkel He 119 in its use of coupled engines driving a single propeller. It also featured a tricycle undercarriage giving it an appearance similar to the Messerschmitt Me 509. Completed in April 1945, the prototype made a short flight on 8 May, but was destroyed in a US air raid only a few days later, thus ending development. A proposal was also made to develop the R2Y into a turbojet-powered light bomber by replacing its piston engines with two Ishikawajima Ne-330s. Designated the R2Y2 Keiun-Kai, the design was also begun to work on second prototype but it was never completed.
Yokosuka R2Y1 Keiun
Type: long-range reconnaissance aircraft Service: Japanese Navy Air Force (JNAF) Crew: 2 (pilot and radio operator/navigator) Armament: none Reference: Francillon: 472 Specifications: Length: 42' 9.75" (13.05 m) Height: 13' 11" (4.24 m) Wingspan: 45' 11" (14 m) Wing area: 365.972 sq. ft (3 sq. m) Empty Weight: 13261 lbs (6015 kg) Loaded Weight: 17857 lbs (8100 kg) Max Weight: 20723 lbs (9400 kg) Propulsion: No. of Engines: 1 Powerplant: Aichi Ha-70 10 (twin-coupled Aichi Atsuta 30s) twenty-four cylinder liquid-cooled engine Horsepower: 3100 hp at 9845 ft (3000 m) Performance: Range: 1950 naut miles (2244 st miles) Cruise Speed: 288 mph at 13125 ft (250 kt at 4000 m) Max Speed: 447 mph at 32810 ft (388 kt at 10000 m) Climb to/in: 32810 ft (10000 m) in 10 min Ceiling: 38385 ft (11700 m)
Production: one R2Y1 was completed in 1945. one R2Y2 was almost completed.
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