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Kawasaki Ki-91 long range heavy bomber

hesham

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I don't have this book,but the big surprice to me that my friend told me ,
he saw Kawasaki G11K bomber in Japanese book (possibly devloped from Ki-91)
and he don't know it is fiction or not.
 

hesham

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here is an artist picture to Kawasaki Ki-91 bomber.
 

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T-50

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Hello dear people
Has someone technical drawnings or artist inpressions of the Kawasaki bomber project?
Im very interested in Japanese ww2 aircraft projects
greetings T-50
 

T-50

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Hello folks thaks for the info and drawnings,especially those from Escanaer these are realy cool!
 

blackkite

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Hi! Kawasaki Ki 91.
Over all length:33.35m, Height:10.00m, Wing span:48.00m, Wing Area:224.0m2, Empty:34000kg, MTOW:58000kg, Max Speed:580km/h(@10,000m). Service ceiling:13500m, Range:9000km. Engine:Mitsubishi HA214 LU 2,500hp at take off: Crew:8, Armament:20mm cannon×12; Bomb:4,000kg~8,000kg
Sorry for low quality. You can see larger image by enlarging 3 side view drawing in the PDF file. How about this drawing, T-50-san?
Source:http://www.sjac.or.jp/common/pdf/kaihou/201002/20100203.pdf
 

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airman

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blackkite said:
Hi! Kawasaki Ki 91.
Over all length:33.35m, Height:10.00m, Wing span:48.00m, Wing Area:224.0m2, Empty:34000kg, MTOW:58000kg, Max Speed:580km/h(@10,000m). Service ceiling:13500m, Range:9000km. Engine:Mitsubishi HA214 LU 2,500hp at take off: Crew:8, Armament:20mm cannon×12; Bomb:4,000kg~8,000kg
Sorry for low quality.
ok, low quality, but nice drawing of Kawasaki Ki-91 :)
 

JFC Fuller

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It is probably a good thing that this never made it to the hardware stage, it was powered by the same Ha.214 engines used in the Rikugan Ki-93 and they came in a very long way under power, in fact each engine on the Ki-91 would probably have been 700hp short of design power.
 

blackkite

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Hi! The best I have. Enjoy.
 

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Grey Havoc

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Was no.9 meant to be a rest station?
 

blackkite

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Winston said:
Just a little 'bump'.
Here is the layout of the Ki-91.


Source: the Xplanes of the Imperial Japanese Army & Navy, 1924-1945. Page 100-101.
Thanks. Just surprising Kawasaki Ki-91 detail drawings!!! How about Fugaku? ;)
 

blackkite

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Hi! Kawasaki Ki-91 long range heavy bomber
Length : 33.35 m
Height : 10.00 m
Span : 48.00 m
Wing area : 224.0 m²
Aspect ratio : 10.3
Wing cross section : Laminar flow wing
Empty weight : 34,000 kg

Gross weight : 58,000 kg
Maximum speed : 570 km/h (at 10,000 m)
Service ceiling : 13,500 m
Time climb to 8,000 m: 20minutes 30seconds
Range : 9,000 km(with 4ton bomb)
Over 10,000km(without bomb)
Engine : Mitsubishi HA214Ru turbo charged air cooling radial 18cylinders(2,500 hp × 4)
Propeller : constant speed, 4 blades, diameter 4.4 m
Fuel :27,500ℓ(the wing contained almost fuel)
Crews : 8
Armaments : 20 mm cannon × 9、Bomb : 8,000 kg(max)


The line which connect inner and outer propeller spinner top in the 3 side view is parallel to the wing leading edge line, but the wind tunnel test model's same line is not parallel to the wing leading edge line.

http://matever.com/archives/ct01complete/_91_1144.html
 

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Steve Pace

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It must be an optical illusion or maybe my age has taken some of my eye sight but I can't see the main landing gear bogies retracting up into and fitting in to their respective wheel wells. Maybe it's me. -SP
 

T-50

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very nice drawings of the Kawasaki Ki-91 heavy bomber redstar72!
This plane and the Nakajima G8N Rita were if build exelent bombers for the longrange squadrons of the Japanese army airforce!
And If Nakajima had managed to build the ultra heavy super bomber the G10N Fugaku,then were the alied citys also turned into rubble.
 

blackkite

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Many thanks Steve san, redstar72 san and T-50 san!
In May of 1943, the IJA decided to cancel Ki-85(modified Shinzan,G5N,), ordered Kawasaki to develop long range heavy bomber Ki-91 in 9th of July.
Required Ki-91 performance were as follows.
Maximum speed : 580km/h(at 10,000m)
Range : 9,000km with 4 ton bomb
Armament : 20mm cannon ×9, bomb 8ton(max)
To realize required performance, pressurized cabin and turbo charged engine were needed.
But Kawasaki did not have pressurized cabin technology at the day, decided to develop No.1 aircraft without pressurized cabin and used as a stability and control test bed. Finally No.1 aircraft was planned to have pressurized cabin.So I believe that the planned final shape of Ki-91 was little different from this 3 side view drawing and this wind tunnel test model shape, especially cabin shape. We have the chance to guess it's shape . No.1 aircraft was planned to complete in June 1946, No.2 aircraft was planned to complete in march 1947. The first full scale mock up examination was carried out in April 1944, the second was carried out in May 1944. In June 1944, fabrication of jig begun. But in November 1944, B-29 bombing became hard, it became impossible to continue development for such a big aircraft, Ki-91 was canceled in February 1945 when 60% of design was finished. Wing cross section was laminar flow type which applied Ki-94 fighter. Finally HA-50 engine was planned to use.(same as Fugaku)
I think Ki-91's mission was Saipan B-29 base bombing.
Source : All the Experimental Aircraft in Japanese Army, Kantosha, ISBN978-4-87357-233-8 C9476
 

blackkite

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Saipan B-29 base received several Japanese aircraft attack. And some B-29 were destroyed without Ki-91.
Japanese aircraft which attack Saipan B-29 base were the IJA's Mitsubishi type 97 bomber(97式重爆撃機), the IJN's Mitsubishi type 1 bomber(一式陸上攻撃機) and Mitsubishi Zero fighter(零式艦上戦闘機) from Iou island(硫黄島). They were all Mitsubishi's aircrafts. ;)
 

foiling

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Again, thank you for excellent contributions Blackkite.
 

T-50

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blackkite said:
Hi! Ki-91 strength test model.
[/quote
thank you again blackkite san! these are marvelous pics! very rare in the west that I can asure you!
]
 

blackkite

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Stargazer2006

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New topic split from the "Japanese Projects before 1945" topic.
 

Stargazer2006

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blackkite said:
Please marge these topics,too. :D
Done! Thanks a lot blackkite for this precious contribution, which means we now have all the forum's information and pics about the Ki-91 in one place.
 

blackkite

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Many thanks Star. Great effort!!
 

blackkite

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Hi! Better image.

(1)爆撃席 (2)副操席 (3)正操席 (4)指揮官席(長機ノ場合ノミ)(5)指揮官机 (6)機関席 (7)航法席(兼後下砲)(8)無線席(兼前下砲)(9)航法机 (10)予備席

(1) Seat of a bomb aimer (2) Co-pilot seat (3) Pilot seat (4) commanders' seat (it installed only the airplane formation commander got into the airplane) (5) commander's desk (6) Flight engineers' seat (7) Navigator’s seat(Navigator operated the swivel cannon installed in the lower part of the rear fuselage of the airplane) (8) Radio operator’s seat(Radio operator operated swivel cannon installed in the lower part of forward fuselage of the airplane)(9) Navigator's desk (10)Reserve seat

(11)爆撃手(兼前上砲射手)機関手(兼後上砲)無線手(兼尾部砲)兵員席兼寝台
(11)Bomb aimer(Bomb aimer operated the swivel cannon installed in the upper part of the front fuselage of the airplane), flight engineer(flight engineer operated the swivel cannon installed in the upper part of the rear fuselage of the airplane), Radio operator(Radio operator operated tail swivel cannon) seats/beds
 

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blackkite

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Hmmm.....This model is little different from Kawasaki's original drawing.
 
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