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/ Yokosuka H5Y
The Yokosuka H5Y / Yokosuka Navy Type 99 Flying Boat Model 11
was an IJNAS flying boat in service from 1938.
The H5Y was accepted for production in 1938 as the Type 99 Flying Boat Model 11, production deliveries starting in 1939.
However, production was quickly cancelled owing to the poor performance, only 20 being built.
Although some were used for coastal anti-submarine patrols early in World War II, they were quickly transferred to second line duties such as transport or training.
2 Prototypes constructed at the Hiro Naval Arsenal
Production model, 18 built.
Yokosuka Navy Type 99 Flying Boat Model 11
The long formal designation of the H5Y.
20.53 m (67 ft 4 in)
31.57 m (103 ft 7 in)
6.71 m (22 ft 0 in)
107.7 m2 (1,159 sq ft)
7,070 kg (15,587 lb)
11,500 kg (25,353 lb)
2 × Mitsubishi MK1A Shinten 21 14-cylinder air-cooled radial piston engines,
890 kW (1,200 hp) each
3-bladed variable-pitch propellers
306 km/h (190 mph, 165 kn) at 700 m (2,297 ft)
4,800 km (3,000 mi, 2,600 nmi)
5,200 m (17,100 ft)
Time to altitude
3,000 m (9,843 ft) in 24 minutes
3× 7.7 mm (.303 in) machine guns
2× 250 kg (552 lb) bombs.
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