1. Development and design

2. Specifications

3. References

The Watanabe K8W was a Japanese floatplane trainer designed and built by Watanabe for the Imperial Japanese Navy.

Development and design

In 1937, the Imperial Japanese Navy drew up a specification for a 12-shi{{#tag:ref|In the Japanese Navy designation system, specifications were given a Shi number based on the year of the Emperor's reign it was issued. In this case 11-Shi stood for 1936, the 11th year of the Shōwa era.^[1]|group=lower-alpha}} primary floatplane trainer to replace its Yokosuka K4Y or Navy Type 90 Primary Seaplane Trainer. The specification was issued to the established builders of aircraft for the Navy, Kawanishi and Watanabe and to the relative newcomer Nihon Hikoki (also known as "Nippi").^[2] The specification required use of the same Gasuden Jimpu radial engine used by the K4Y, and the three designs showed little changes from the aircraft they were to replace.^[3]

Watanabe's design, which was given the short designation K8W1, was, like the other two designs, a single-engine biplane with a fabric-covered steel-tube fuselage and a wooden wing, with two floats. The trainee and instructor sat in individual open cockpits.^[4] The first of three prototypes made its maiden flight in 1938.^[4] The Watanabe design was judged inferior to that of the Kawanishi design, and thus did not enter production.

Specifications

|genhide=
|crew=2
|capacity=
|length m=8.70
|length ft=
|length in=
|length note=
|span m=10.00
|span ft=
|span in=
|span note=
|width note=
|height m=
|height ft=
|height in=
|height note=
|wing area sqm=25.0
|wing area sqft=
|wing area note=
|aspect ratio=
|airfoil=
|empty weight kg=750
|empty weight lb=
|empty weight note=
|gross weight kg=1015
|gross weight lb=
|gross weight note=
|max takeoff weight kg=
|max takeoff weight lb=
|max takeoff weight note=
|fuel capacity=
|lift note=
|more general=

|eng1 number=1
|eng1 name=Gasuden Jimpu 2
|eng1 type=seven-cylinder air-cooled radial engine
|eng1 kw=
|eng1 hp=160
|prop blade number=
|prop name=
|prop dia m=
|prop dia ft=
|prop dia in=
|prop dia note=

|perfhide=
|max speed kmh=148
|max speed mph=
|max speed kts=
|max speed note=
|max speed mach=
|cruise speed kmh=104
|cruise speed mph=
|cruise speed kts=
|cruise speed note=
|stall speed kmh=
|stall speed mph=
|stall speed kts=
|stall speed note=
|never exceed speed kmh=
|never exceed speed mph=
|never exceed speed kts=
|never exceed speed note=
|minimum control speed kmh=
|minimum control speed mph=
|minimum control speed kts=
|minimum control speed note=
|range km=420
|range miles=
|range nmi=
|range note=
|endurance=
|ceiling m=3,500
|ceiling ft=
|ceiling note=
|g limits=
|roll rate=
|glide ratio=
|climb rate ms=
|climb rate ftmin=
|climb rate note=
|time to altitude=
|more performance=
|avionics=
}}

References

• {{cite book|last1=Mikesh |first1=Robert C. |last2=Abe|first2=Shorzoe |title=Japanese Aircraft 1910–1941 |year=1990 |publisher=Putnam Aeronautical Books |location= London |isbn=0-85177-840-2 |ref=harv}}

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