Yokosuka R2Y Keiun

The Yokosuka R2Y Keiun was a prototype reconnaissance aircraft built in Japan late in World War II.

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 Mitsubishi Ne-330s.

Designated the R2Y2 Keiun Kai, it did not enter construction before the end of the war.

Specifications

Crew

2 

Length

13.04 m (42 ft 9 in)

Wingspan

13.99 m (45 ft 11 in)

Height

4.23 m (13 ft 11 in)

Wing area

33.99 m2 (365.9 sq ft)

Empty weight

6,015 kg (13,261 lb)

Gross weight

8,100 kg (17,857 lb)

Max takeoff weight

9,400 kg (20,723 lb)

Fuel capacity

1,555 l (411 US gal; 342 imp gal)

Powerplant

1 × Aichi Ha-70 (unified) 24-cylinder liquid-cooled coupled V-12 piston engines, 2,500 kW (3,400 hp) for take-off

2,312 kW (3,100 hp) at 3,000 m (9,843 ft)

Propellers

6-bladed constant-speed metal propeller

Performance

Maximum speed

718.5 km/h (446.5 mph, 388.0 kn) at 10,000 m (32,808 ft)

Cruise speed

463 km/h (288 mph, 250 kn) at 4,000 m (13,123 ft)

Landing speed

166 km/h (103 mph; 90 kn)

Range

3,139 km (1,950 mi, 1,695 nmi)

Ferry range

3,611 km (2,244 mi, 1,950 nmi)

Service ceiling

11,700 m (38,400 ft)

Time to altitude

10,000 m (32,808 ft) in 21 minutes

Wing loading

238.26 kg/m2 (48.80 lb/sq ft)

Power/mass

0.3161 kW/kg (0.1923 hp/lb).