IJN Service Airplane Development Program Designations

[snark]

Hi Folks

This is my list of (documented; not speculative) IJN Service Airplane Development Program designations. Any additions/corrections are welcome. This table is strictly for my own files. Thanks. Harry

Known SADP Designations:

• Kawanishi K-10 14-Shi High-speed Reconnaissance Seaplane [E15K Shiun]
• Kawanishi K-20 15-Shi Fighter Seaplane [N1K Kyofu]
• Kawanishi K-30 Transport Flying Boat [H8K2-L Seiku]
• Kawanishi K-60 Long-range 80-ton Flying Boat (project)
• Kawanishi K-90 (KX-2) 17-Shi Interceptor Fighter (Ko) [J3K Jinpu] (cancelled)
• Kawanishi K-100 (KX-1) 17-Shi Land-based Attack Plane (cancelled)

• Mitsubishi M-20 14-Shi Interceptor Fighter [J2M Raiden]
• Mitsubishi M-50 17-Shi Carrier Fighter [A7M Reppū]
• Mitsubishi M-60 16-Shi Land-based Attack Plane [G7M Taizan] (cancelled)
• Mitsubishi M-70 17-Shi Interceptor Fighter (Otsu) [J4M Senden] (cancelled)

• Nakajima N-20 18-Shi Interceptor Fighter [J5N Tenrai]
• Nakajima N-40 18-Shi Land-based Attack Plane [G8N Renzan]
• Nakajima N-50 17-Shi Carrier Reconnaissance Plane [C6N Saiun]

• Kugisho Y-10 13-Shi Carrier Bomber [D4Y Suisei]
• Kugisho Y-20 15-Shi Land-based Bomber [P1Y Ginga]
• Kugisho Y-30 17-Shi Land-based Recce Plane [R1Y Seiun] (cancelled)
• Kugisho Y-40 18-Shi Land-based Reconnaissance Plane [R2Y Keiun]
• Kugisho Y-50 All-wooden trainer version of D3A Carrier Bomber [D3Y1-K Myojo]

 

[hesham]

Nice work Snark,

here is also Kawanishi K-120 & K-200;

http://www.secretprojects.co.uk/forum/index.php/topic,661.msg7765/highlight,k-120.html#msg7765

 

[snark]

Hi Hesham

Thanks for the kind words!

I'm aware of these designations but I'm hesitant to add them to my list because of uncertainty about their Pacific War origins. Does anyone have Pacific War-era Japanese documentation of these projects?

Of course, given Blackkite's amazing research and subsequent revelations concerning Project Z/Fugaku, I suppose anything is possible.

The IJN/IJA late-war projects were certainly visionary... Best, Harry

 

[snark]

New addition:

• Nakajima N-10 (3K) 14-Shi Carrier Attack Plane [B6N Tenzan]

Harry

 

[hesham]

Nice find Snark.

 

[snark]

Another new addition:

• Mitsubishi M-80 19-Shi All-wood Land-based Attack Plane [Tozan] (cancelled)

From Ishiguro, Ryusuke and Januszewski, Tadeusz, Japanese Anti-submarine Aircraft in the Pacific War. ISBN 978-83-65281-39-5, pages 124 - 133

 

[hesham]

Another new addition:

• Mitsubishi M-80 19-Shi All-wood Land-based Attack Plane [Tozan] (cancelled)

From Ishiguro, Ryusuke and Januszewski, Tadeusz, Japanese Anti-submarine Aircraft in the Pacific War. ISBN 978-83-65281-39-5, pages 124 - 133

Nice find snark.

 

[snark]

Hi Folks


In “Japanese Anti-submarine Aircraft in the Pacific War”, by Ishiguro and Januszewski, there is reference to the “Jitsu Kei Bango numbering system of development programs for experimental aircraft…” Unfortunately, the authors did not include a Kanji rendition of this phrase, which makes further research by “monolingual” folks like me really difficult.

I’ve been researching the Service Airplane Development Program (SADP) designations for some time, but have never before seen this phrase. Perhaps there is still some new information on this topic to be found in Japan, since the authors subsequently revealed the previously-unmentioned Mitsubishi M-80?


FYI:

Reply by Email very kindly provided by Ryusuke Ishiguro:

"Jitsu Kei Bango is short from Jitsuyo-ki Shisei Keikaku Bango (実用機試製計画番号)
or Shisei-ki ryaku bango (試製機略番号) - short numerical system about program of prototypes, as: M-70, N-60 or another."

Phrase literally translates as "Practical Machine Trial Manufacture Plan number". I believe this system was conceived as an attempt to ensure that proposed designs were relevant to future requirements. First time I've seen this terminology.

Best Regards,

Harry