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.

Variants

H5Y 

2 Prototypes constructed at the Hiro Naval Arsenal

H5Y1

Production model, 18 built.

Yokosuka Navy Type 99 Flying Boat Model 11 

The long formal designation of the H5Y.

Specifications

Crew

6

Length

20.53 m (67 ft 4 in)

Wingspan

31.57 m (103 ft 7 in)

Height

6.71 m (22 ft 0 in)

Wing area

107.7 m2 (1,159 sq ft)

Empty weight

7,070 kg (15,587 lb)

Gross weight

11,500 kg (25,353 lb)

Powerplant

2 × Mitsubishi MK1A Shinten 21 14-cylinder air-cooled radial piston engines,

890 kW (1,200 hp) each

Propellers

3-bladed variable-pitch propellers

Performance

Maximum speed

306 km/h (190 mph, 165 kn) at 700 m (2,297 ft)

Range

4,800 km (3,000 mi, 2,600 nmi)

Endurance

26 hours

Service ceiling

5,200 m (17,100 ft)

Time to altitude

3,000 m (9,843 ft) in 24 minutes

Armament

Guns

3× 7.7 mm (.303 in) machine guns

Bombs

2× 250 kg (552 lb) bombs.