Yokosuka H5Y

Infobox Aircraft
name = H5Y
type = Flying boat
manufacturer = Yokosuka

---

caption = Yokosuka H5Y Type 99 Flying Boat "Cherry"
designer =
first flight = 1936
introduced = 1939
retired =
status =
primary user = IJN Air Service
more users =
produced = 1938 - 1941
number built = 20
unit cost =
variants with their own articles =

The Yokosuka H5Y (allied code name Cherry) was an Imperial Japanese Navy flying boat with a Japanese Navy designation of Type 99 Flying Boat (九九式飛行艇, "99shiki hikōtei"). Only 20 were built between 1936 and 1941. Yokosuka arsenal contracted Dai-Juichi Kaigun Kokusho to perform the manufacturing.

Design and development

The H5Y was designed by Yokosuka to meet an Imperial Japanese Navy requirement for a twin engined maritime reconnaissance flying boat, which was intended to match the performance of contemporary four engined flying boats while being cheaper to build and easier to maintain. Two prototypes were built at the 11th Naval Arsenal, Hiro, being completed in 1936Green 1972, p. 136-137.] .

The H5Y was a twin engined parasol winged aircraft, and thus resembled a scaled down version of the Kawanishi H6K "Mavis". Performance was found to be poor however, with the aircraft underpowered and suffering from structural problems which delayed production [Francillon 1979, p. 495.] .

Operational history

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 builtcite book|author= Donald, David (Editor)|title = The Encyclopedia of World Aircraft|year = 1997
publisher= Aerospace Publishing|isbn= 1-85605-375-X] .

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

;Prototypes:2 examples constructed in Hiro Navy Arsenal;H5Y1 (Type 99 Navy Flying Boat, Model 11):Production model, 18 built.

Operators

;JPN
*Imperial Japanese Navy Air Service

pecifications (Yokosuka H5Y1)

aircraft specifications

plane or copter?=plane
jet or prop?=prop
ref=Warplanes of the Second World War, Volume Five: Flying Boats
crew=Six
length main=20.53 m
length alt=67 ft 4 in
span main=31.57 m
span alt=103 ft 7½in
height main=6.71 m
height alt= 22 ft 0 in
area main=107.7 m²
area alt=1,159 ft²
empty weight main=7,070 kg
empty weight alt=15,554 lb
max takeoff weight main=11,500 kg
max takeoff weight alt=25,353 lb
engine (prop)= Mitsubishi MK1A Shinten-21
type of prop=fourteen-cylinder air-cooled radials
number of props=2
power main=895 kW
power alt=1,200 hp
max speed main= 303 km/h
max speed alt= 163 knots, 188 mph
range main= 4,800 km
range alt= 2,591 nm, 2,980 mi
ceiling main= 5,200 m
ceiling alt= 17,000 ft
climb rate main=
climb rate alt=
loading main=
loading alt=
power/mass main=
power/mass alt=
more performance=
*Endurance: 26 hr
*Climb to 3,000 m (9,850 ft): 24 min

armament=
*3 x 7.7 mm machine guns,
*2 x 250 kg (550 lb)bombs

References

Notes

Bibliography

* Francillon, René J. "Japanese Aircraft of the Pacific War". London: Putnam & Company Ltd., 1970 (2nd edition 1979). ISBN 0-370-30251-6.
* Green, William. "Warplanes of the Second World War, Volume Five: Flying Boats". London: Macdonald & Co.(Publishers) Ltd., 1962 (5th impression 1972). ISBN 0-356-01449-5.

External links

* [http://www.combinedfleet.com/ijna/h5y.htm www.combinedfleet.com]
* [http://avia.russian.ee/air/japan/yokosuka_h5y.html avia.russian.ee]
* [http://www.fsdome.com/aviation-encyclopedia/planes/country/japan/planes/96.htm www.fsdome.com]

ee also

aircontent
related aircraft=

similar aircraft=

lists=
* List of flying boats
* List of military aircraft of Japan