Mitsubishi Ki-99

[airman]

Is it a typo of Mitsubishi Ki-109 or an other based Ki-67 fighter or what else ?!

 

[blackkite]

Ummm......no information.
Note ; Ki number which have * mark indicate that official document have not discovered still now.(注 キ番号の前の*印は資料の未確定なもの)
http://www.warbirds.jp/text/rikugun.htm

One opinion.
キ99(Ki99)　　　　　近距離戦闘機(Short range fighter (Interceptor?))　　　　三菱(Mitsubishi)　　　計画のみ(planned only)
http://pico32.web.fc2.com/rikugun/coauthor/kibango-kai.htm

 

[airman]

thank you blackkite !

 

[blackkite]

Gakken's "The IJA aircraft" says that Ki-99 was the IJA and the IJN's joint program ordered to Mitsubishi in 5/7/1943 by document name 航密第8476号(Secret or pressurized cabin aircraft development order No.8476?).
Perhaps 航 means 航空機(The aircraft) and 密 means 秘密(secret) or 気密(pressurized cabin).
Ki-99 was a single seat single engine short range fighter with Ha-211 engine(Mitsubishi Ha-43(MK9) engine), two 30mm cannon and two 20mm cannon.
This project was cancelled in May 1944 due to slow development speed.

Mitsubishi Ha-43 engine.
http://www.secretprojects.co.uk/forum/index.php?topic=21030.0
Basically MK9 engine was a high altitude engine.
MK9A : With turbocharger, intercooler and forced cooling fan ; Ki-83, A7M3-J, Manshu Ki-98, Manshu Ki-65?, Mitsubishi Ki-99?
(MK9A without turbocharger, intercooler and forced cooling fan type ; A7M2 Reppu)
MK9B : With Valkan coupling drive first stage supercharger and mechanical drive Second stage supercharger ; Kawanishi J3K1, A7M2-J, Kawanishi N1K5-J?
MK9C : With single stage three speed mechanical super charger ; A7M3
MK9D : Pusher type MK9B ; J7W Shinden

I imagine that there were some relation between Ki-99 and Reppu(also once called Reppu -kai) A7M2-J with MK9B engine, Reppu-kai A7M3-J with MK9A engine,Reppu A7M3(temporaly name three speed Reppu) with MK9C engine and Manshu Ki-65.

I imagine that A7M2-J nose shape looks like Kawanishi N1K5-J.
http://www.secretprojects.co.uk/forum/index.php?action=dlattach;topic=4802.0;attach=564797;image

Fate of Ki-99 looks like fate of J6K. ;D

 

[airman]

Then Mitsubishi Ki-99 could be Army variant of Mitsubishi A7M Reppu ?!

 

[blackkite]

Then Mitsubishi Ki-99 could be Army variant of Mitsubishi A7M Reppu ?!

Ummm.......I'm not sure. Reppu was basically a carrier air superiority fighter. Ki-99 was a short range interceptor.
Ki-99 was a small wing Reppu? Power increased Raiden? Manshu ki-65 base design? Or more radical design?

Manshu Ki-65.
http://www.secretprojects.co.uk/forum/index.php/topic,22777.msg231604.html#msg231604
http://www.secretprojects.co.uk/forum/index.php/topic,7300.msg63901.html#msg63901

 

[Airborne2001]

The only thing I can think of is the fantasy aircraft from the Japanese manga "The Cockpit".


The designation is probably real, but I am not sure what for. Whether or not it was indeed for an interceptor remains to be seen.

 

[blackkite]

Hi! Fictional fighter.

View: https://www.youtube.com/watch?v=6AAfjDjwS7U

 

[blackkite]

By Reiji Matsumoto.
https://en.wikipedia.org/wiki/Leiji_Matsumoto
https://en.wikipedia.org/wiki/The_Cockpit_(OVA)

 

[T. A. Gardner]

The Mitsubishi Ki 51 is also referred to as the Type 99 light attack plane. Maybe this is just a confusion of the two designations?

 

[SatinWings]

Some more information on this designation appears to be found in Mike Goodwin's and Peter Starkings' 2017 book Japanese Aero-Engines (p.117), where it is described as being a Mitsubishi "single-engine, single-seat design with two 20mm and two 30mm cannon, and an altitude performance specified as 700 km/h at 13,000m" using the Ha-211 (unified designation Ha-43) engine.
But as the citations in this book are a little more than lacking, the provenance of this information is entirely unknown to me so I'm unable to verify it.