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Author Topic: G10N Fugaku derived projects  (Read 84574 times)

Offline T-50

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G10N Fugaku derived projects
« on: February 28, 2010, 02:19:59 pm »
 Hello people Im curious if there were derived projects in development from the mega bomber Fugaku,for example were the Japanese developing a carco variant of this big airplane,or lighter bomber varians with less engines,range etc
I hope some one can help me with info drawnings of these projects.

Offline blackkite

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Re: G10N Fugaku derived projects
« Reply #1 on: February 28, 2010, 08:00:08 pm »
It's very difficult to find precise Fugaku variant drawings,also base design,too.
Almost drawings were lost.
Base design : Nakajima  HA54 engine(5,000hp in take off) ×6
Variant①    : Nakajima  HA44 engine(2,500hp in take off) ×6
Variant②    : Mitsubishi HA50 engine(3,000hp in take off) ×6
Variant③    : Kawanishi design
I will study these designs and post.
« Last Edit: March 02, 2010, 07:45:51 pm by blackkite »

Offline lark

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Re: G10N Fugaku derived projects
« Reply #2 on: March 01, 2010, 12:24:18 pm »
There were at least two gunship versions planned by Nakajima.

One for use against hostile bomber formations and an
other against deck crews of enemy ships.

The first should use a battery of guns in the belly
of a Fugaku variant to rain down a hail of 20mm
grenades on incoming bomber formations.

The other a series of machine guns in ventral
position to wipe out the the AA guncrews on the ships
and to facilitate also the air attacks on the ships.

These two planned versions were only a few of the several
Mukade - centipede- projects.

Source : Arawasi International Magazine May 2006 issue-Nr.4

Offline blackkite

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Re: G10N Fugaku derived projects
« Reply #3 on: March 03, 2010, 05:23:13 am »
Nakajima Chikuhei anticipated strategic bombing to Japan by B-29 in early 1942. To protect Japan from strategic bombing,he planned strategic bombing to the United States!! by very large bombers utilizing the westerlies(jet stream).(Ki-46Ⅳmarked over 700km/h average speed from Beijing to Tokyo utilizing jet stream.) In April 1943, he assembled elite Nakajima's designers(Yasushi Koyama,Yasuo Naito,etc) to the Nakajima club(welfare facility) and ordered them to perform basic design of this large bomber until June 1943. The design result was 6 engine(5,000hp take off power) bomber, which range was 16,000km with 20 ton bomb. After this effort, Chikuhei made 50 copies of "Winning strategy(必勝戦策)" in secret, explained to the political world, the financial world and the circle of government officials in August 1943. "Winning strategy" included two plans for this large bomber, one plan was designed by Nakajima aircraft Koizumi(小泉) factory IJN aircraft design department, which had single vertical tail stabilizer. Another one was designed by Nakajima aircraft Ohta(太田) factory IJA aircraft design department, which had double vertical tail stabilizer. Attached illustration for IJN aircraft design department's plan is from Fuji Heavy Industries calender in 1980.
These two designs are base for variants.
These designs were called Z-plane.
http://www.ne.jp/asahi/airplane/museum/nakajima/FUGAKU.html
« Last Edit: March 05, 2010, 04:14:52 am by blackkite »

Offline lark

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Re: G10N Fugaku derived projects
« Reply #4 on: March 03, 2010, 12:03:08 pm »
Excellent.The color illustration produced by the design dept. is
clearly based on the 3-view on page 260 of Aireview's General view of
Japanese Military Aircraft in the Pacific War- Kantosha,Tokyo.
One of the oldest I ever have seen.
According your interpretation, should there have been two initial 'Z' plan concepts ..?

Offline blackkite

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Re: G10N Fugaku derived projects
« Reply #5 on: March 03, 2010, 02:14:55 pm »
Excellent.The color illustration produced by the design dept. is
clearly based on the 3-view on page 260 of Aireview's General view of
Japanese Military Aircraft in the Pacific War- Kantosha,Tokyo.
One of the oldest I ever have seen.
According your interpretation, should there have been two initial 'Z' plan concepts ..?

That's right!! There was a design competition between Koizumi factory and Ohta factory of Nakajima aircraft.

Offline lark

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Re: G10N Fugaku derived projects
« Reply #6 on: March 05, 2010, 11:28:25 am »
This confirms the info which I found and received.

Naval design section-Koizumi factory proposed a single tailfin version
Army design section-Ota factory proposed a design with twin tailfins.

A third an final 'Z' plan bomber by Nakajima was inspired on the best
of the two initial concepts.

This 3e design formed the basis for what
should become the Fugaku.

among the sources : correspondence with Mr.Ryusuke Ishiguro ,author of
Japanese Special attack aircraft & flying bombs.
(with Tadeusz Januszewski a.o)

Offline blackkite

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Re: G10N Fugaku derived projects
« Reply #7 on: March 05, 2010, 09:02:10 pm »
Hi! I made a table for Fugaku variant specification.
In my No2 Bible(ENCYCLOPEDIA OF JAPANESE AIRCRAFT 1900-1945,NAKAJIKA Volume), there is a 3-side view of Fugaku.
It has single propeller, I think it is Fugaku HA44 or HA50 varint.
The Fugaku design team faced many difficult problems at the day,such as engine cooling, under carriage including big tires,wing root strength, pressurized cabin.
One of the most hard one was a HA54 engine cooling problem,and they must considered some variants for early realization of Fugaku.
(Sorry B-36J's J47 number is 4 while my table is 6.)  
http://matever.com/archives/ct01complete/_1144.html
http://blogs.yahoo.co.jp/yuunagi_dameya/7557760.html
« Last Edit: March 06, 2010, 11:26:02 pm by blackkite »

Offline airman

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Re: G10N Fugaku derived projects
« Reply #8 on: March 06, 2010, 03:10:47 am »
well , it's solved also question of Kawanishi TB !!  :) :D
Thanks blackkite  !  ;D
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Offline blackkite

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Re: G10N Fugaku derived projects
« Reply #9 on: March 06, 2010, 03:39:41 am »
Hi airman! You are welcome.
I got 3-side view of Z-plane which designed by IJN aircraft design department of Nakajima Aircraft. Enjoy!
(Or perhaps this is the final Z-plane.)  
Source;Fugaku, Kodan-sha Co.Ltd,Tokyo
« Last Edit: March 06, 2010, 03:11:59 pm by blackkite »

Offline blackkite

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Re: G10N Fugaku derived projects
« Reply #10 on: March 06, 2010, 05:42:17 am »
Hi airman! Another data of Kawanishi TB.
Engine:2,100hp class air cooling radial 18 cylinder with turbo super charger×4.
Wing span:32.4m, Length:28.0m, Height:7.0m, Wing Area:220m2, Empty Weight:26.5ton, MTOW:74ton, Max Speed:601.9km/h@12,000m, Service Ceiling:12,000m, Range:20,372km(4.6ton bomb), 25,557.6km(2to bomb)
Source:All the Experimental Aircraft in Japanese Army, Minoru Akimoto, KANTOSHA, Tokyo.2008.
« Last Edit: March 06, 2010, 05:44:45 am by blackkite »

Offline airman

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Re: G10N Fugaku derived projects
« Reply #11 on: March 06, 2010, 11:18:55 am »
Hi airman! Another data of Kawanishi TB.
Engine:2,100hp class air cooling radial 18 cylinder with turbo super charger×4.
Wing span:32.4m, Length:28.0m, Height:7.0m, Wing Area:220m2, Empty Weight:26.5ton, MTOW:74ton, Max Speed:601.9km/h@12,000m, Service Ceiling:12,000m, Range:20,372km(4.6ton bomb), 25,557.6km(2to bomb)
Source:All the Experimental Aircraft in Japanese Army, Minoru Akimoto, KANTOSHA, Tokyo.2008.
thanks blackkite  ;D
seems a little small  and four - engine versions of Fugaku !  ::)
oh yeah : it's a derived project  !  :D
I hope to see in future also the version cg (computer graphic) of Kawanishi TB.
Could be Kawanishi TB and Kawanishi G9K awesome derived project of Fugaku ?  ???
« Last Edit: March 06, 2010, 11:23:07 am by airman »
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Offline blackkite

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Re: G10N Fugaku derived projects
« Reply #12 on: March 06, 2010, 03:08:32 pm »
This confirms the info which I found and received.

Naval design section-Koizumi factory proposed a single tailfin version
Army design section-Ota factory proposed a design with twin tailfins.

A third an final 'Z' plan bomber by Nakajima was inspired on the best
of the two initial concepts.

This 3e design formed the basis for what
should become the Fugaku.

among the sources : correspondence with Mr.Ryusuke Ishiguro ,author of
Japanese Special attack aircraft & flying bombs.
(with Tadeusz Januszewski a.o)
Hi lark! Your are absolutely right. I modified the table.So colored illustration from FHI calender might be the final Z-plane.I add Koizumi plan which had single prop, but it's apparently mistake.
It had double prop.
« Last Edit: March 06, 2010, 04:05:30 pm by blackkite »

Offline blackkite

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Re: G10N Fugaku derived projects
« Reply #13 on: March 06, 2010, 07:15:59 pm »
Kawanishi TB was the competitor of Fugaku,ordered by Ministry of Military Supplies in 1943. TB means "toyo bakugeki(渡洋爆撃)", in English,oversea bombing. TB was defeated by Fugaku in January 1944. TB's design was joint work between Kawanishi and Tokyo imperial university. Hidemasa Kimura(木村秀政,designer of A-26 and YS-11) was the chief designer of Tokyo imperial university team.
TB had laminar flow wing(LB wing) developed by Ichiro Tani(谷一郎), and had very aerodynamically clean shape. L/D was 35.
Kawanishi G9K was a derivative of H8K 2-shiki flying boat?
« Last Edit: March 07, 2010, 04:43:34 am by blackkite »

Offline lark

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Re: G10N Fugaku derived projects
« Reply #14 on: March 07, 2010, 11:13:55 am »
Great work Blacklite..