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Fugaku : Z-plane, G10 or G12

blackkite

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Many thanks my dear ALBM. No problem at all. I will continue my activity in this section. It's not mistake. ;)
 

Jemiba

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You are trying to reconstruct the Fugaku using the scarce available information,
mainly non-visual, so the result probably will get "source grade 1" only, I think.
It's like reconstructing some kind of dinosaur by just having a single claw, but
you are doing it with great care and expertise. I would agree with Skybolt, but the
borderline between a reconstruction based on very few information and a speculative
project probably is fleeting. Keep on with the good work ! ;)
 

blackkite

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Many thanks my dear Jemiba. You, skybolt and T-50 encouraged me very much. I believe Fugaku was a rather small Z-plane with pressurized cabin, turbo supercharged engines and remote controlled turrets. Base was the Z-plane. Also I believe engine nacelle shape were similar to Renzan's one. Fugaku's wing section is mystery for me. B-29's wing section is very thick.
But I believe Fugaku's wing section was not so thick because wing tip deflected 1.3m to the upward direction in flight.
(Nakajima's engineer Shibuya designed very light weight wing.)
Cabin window shape and vertical tail stabilizer shape are still mystery for me now.
 

blackkite

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Hi! My guess for Fugaku HA44 variant side view. Enjoy.
 

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blackkite

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Hi! My guess for Fugaku HA44 variant 3 side view. Enjoy. :)
I did Japanese SPF member's duty. ;D
Wing side view looks like Mt.Fuji, I think it's one of the reason why her name was Fugaku(富嶽)(the old name of Mt.Fuji(富士山)).
 

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blackkite

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Thanks my friend! :D My next target is Fugaku HA50 variant.
Engines were Mitsubishi HA50, the only survival of the Fugaku project, take off power was 3,300hp/each(total 19,800hp), 22 cylinders air cooling radial turbo supercharged engine. Expected Fugaku HA50 variant performance were as follows.
Top speed:700km/h(12,000m),640km/h(9,000m)
Range:16,500km(15ton bomb),18,000km(10t bomb),19,400km(5ton bomb)
Service ceiling:15,000m
Wing span, length, height were same as HA44 variant.
 

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blackkite

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Some Japanese documents says that Fugaku's height was 8.8m.
If Fugaku's height was 8.8m, she had twin vertical stabilizers, which gave good rear view for upper aft turret, contributed to reduce the height of the assembly building.
I believe this alternative shape was planned in paralleled with the single vertical stabilizer shape.
 

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blackkite

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In Japanese National Diet Library Tokyo, I found following Z,GF and Fugaku data.
In these data, there was no data for Fugaku HA50 variant.
I think expected maximum speed 780km/h for Fugaku HA54 variant is proper, because she had only 4 engines, aerodynamically more clean than Fugaku HA50 variant which had 6 large diameter HA50 engines. I modified my previous table.

I change my 3-side view next target from Fugaku HA50 variant to Fugaku HA54 variant with twin vertical stabilizers.
 

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blackkite

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It's very difficult to understand HA54 engine.
The following site shows the pictures of the design specification and project points document of HA54 engine prepared for the Fugaku design discussion meeting between the IJA,IJN and the Fugaku design team in April of 1944.
http://www.fukuya-works.com/html/others-c.htm
You can see different two types of mechanical superchargers in folowing pictures.
You also see wing leading edge air intakes(for intercooler and turbo supercharger?) for HA54 engine, same as B-17.
HA54 used the combination of mechanical supercharger and turbo supercharger same as B-24?
In this document, Nakajima's engineers excluded the part for turbo supercharger design , because they had some problems for turbo supercharger design still at the time(April of 1944!!).(Source:"Fugaku" by Takanori Maema Kodansha Tokyo Nobember,1991 ISBN4-06-205543-0 C0095)
 

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blackkite

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Of course HA54 had a single array cowl flap.
B-17's air intake position for turbo supercharger and intercooler were possible HA54 air intake position for turbo supercharger and intercooler.
BTW I think this air intake position was a little draggy one for Fugaku.
Low drag shape was very important for such a long range aircraft.
It's hard to find cold air intake position for turbo superchargers and intercoolers in case of Fugaku HA54 variant.
"過給器" means supercharger. "中間冷却器" means intercooler. "空気取り入れ口" means air intake.
 

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blackkite

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Hi P&W R4360 Wasp Major turbo charged engine. I think this is one of the possible shape for turbocharged HA54 engine.
The bottom Fugaku drawing's engine nacelle shape is good except outer 4 engines. ;D

R4360 engine front view shows the air intake at the bottom of the engine nacelle for oil cooler, for turbo charger and inter cooler.
Right side view shows the exhaust pipe to turbo charger, inter cooler at the after top of the engine.
Left side view shows oil cooler(bottom) and cold air piping from air intake to inter cooler(vertical piping), supply air piping from inter cooler to engine cylinders.(horizontal piping)
 

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Tzoli

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I have a question regarding the G10N Fugaku.
Once I read somewhere that there could be a Jet powered variant of this bomber called G10N2 Fugaku-Kai with 6 jet engines replaced the piston ones, like on the J7W1/W2 Shinden / Shinden-Kai. Does such design or proposal really existed?
 

blackkite

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Oh! I have never heard about Fugaku-kai. :eek:
I wonder that jet engine's fuel consumption was very large for such a long range aircraft at the day.
 

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blackkite said:
Oh! I have never heard about Fugaku-kai. :eek:
I wonder that jet engine's fuel consumption was very large for such a long range aircraft at the day.

I do think so too. If such project existed it would reduce the range of the craft, maybe half??? But significantly increase it's speed and bomb load am I right?
 

blackkite

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Hi! For Fugaku research, I got this 607 pages large book recently.(U,S, $74.95)
You can see technical detail of R-4360 engine, including various turbo charging system study.
You also see followinf aircraft's turbo charging system.
Republic XP-72, Hughes XF-11, HK-1, Northrop XB-35(very interesting arrangement!),Curtis XP-71, Convair B-36, Republic Rainbow, Boeing B-377,etc.
 

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blackkite

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Hi! Many thanks for your wonderful and excellent free books.
According to "The story of IJA's aircrafts plan(日本陸軍機の計画物語)".(Aviation Journal 1980),the IJA's engineer thought that experimental model maker of these light bomber as Tachikawa or Kawasaki were appropriate. The IJA did basic plan of these light bombers.

Recently I find another Fugaku drawings. The arrangement of pressurized cabin is impressive.
 

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Winston

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Grey Havoc said:
Was no.9 meant to be a rest station?
It would appear so, unfortunately I cannot translate the legend on the second last image. Maybe someone else can?


blackkite said:
Thanks. Just surprising Kawasaki Ki-91 detail drawings!!! How about Fugaku? ;)
Project Z bomber: Nakajima G10 Fugaku



My Source: the Xplanes of the Imperial Japanese Army & Navy, 1924-1945. Page 260-261.
 

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blackkite

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Hi! Fujimimokei's new model Fugaku HA-54 variant. It will release the end of this September.
This model has 4 turbochargers for 1 engine!!. I already ordered this model. Please wait.
http://www.fujimimokei.com/
 

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blackkite

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Hi! Another image of Fugaku. Enjoy.
I'm waiting for Fujimi mokei's Fugaku model. But it's deliver delayed for a month.
Fujimi Mokei's Fugaku model is Fugaku HA-54 variant. Engines are very big. It's good model.
 

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blackkite

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Hi! I find this blueprint in Japanese internet site.
I wonder what it is.
Please take note that each propeller line is parallel to the wing span direction.
It's not a Z-plane's drawing.
There is no fillet at the wing root trailing edge.
http://homepage3.nifty.com/time-trek/else-net/1944-6.html
 

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blackkite

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Hi! Z-plane was a Nakajima's private venture and later became the IJA and the INJ's joint national project called Fugaku.
Chikuhei Nakajima became the chairman of Fugaku committee.
Fugaku committee planned several type of Fugaku, for example Nakajima HA-44(2,450hp each) engine variant and Mitsubishi HA-50(3,300hp each) engine variant, because the IJA and the IJN thought that it's difficult to develop 4 array 36 cylinder HA-54(5,ooohp each) engine.
We already know the specification of HA-44 variant and HA-50 variant. But even HA-50 variant did not satisfy Chikuhei Nakajima.
Finally Chikuhei Nakajima developed Fugaku as if it was a Nakajima's private venture. The engines were HA-54(with turbo charger or with 2 stage mechanical supercharger). Final Fugaku specification is still big mystery for us.
 

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Good idea Jens!
This thread should be restricted to the Fugaku saga only, as an attempt
to clear the picture..
 

hesham

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hesham said:
Hi Flitzer,

the drawing which I saw from four years was to jet engined bomber,and
this drawing for G10N bomber project.


As I know the G12 was a jet bomber project.
 

Jemiba

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blackkite said:
Of course, our better knowledge for Z-plane and Fugaku are here. ;D

http://www.secretprojects.co.uk/forum/index.php/topic,9451.0.html

Indeed ! How could I forget about this ?
As there already were different opinions about the appropriate section for the mentioned thread,
I would like to wait for about two to three days, and wait to get to know your opinions.
As a start: I'm not very happy about the placement in the "theoretical and speculative section", as
to my opinion, the Fugaku actually WAS a project, although most information was lost. Blackkite did
great work to reconstruct it from the available sources and the result may easily be more precise,
than what we take for granted in other cases.
But transitions from one to the other section often are fleeting I think, so I'll wait for your answers.
 

blackkite

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Hi! Jemiba. We thank you very much for your great contribution to this brilliant SPF.
How about divide "Early Aircraft Project" into each country's project, for example England, U.S, Russia, France, Sweden, Germany, Italy, Japan, etc.
And how about divide "each country's project" into fighter,bomber and etc.
 

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hesham said:
hesham said:
Hi Flitzer,

the drawing which I saw from four years was to jet engined bomber,and
this drawing for G10N bomber project.


As I know the G12 was a jet bomber project.
Very interesting story, did the designation for the projected jet bomber realy exist? and if there was a specification for such bomber
how many engines or what type jetengine was planned for this aircraft?
are there artist impressions existing of the G12 bomber?
 

hesham

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T-50 said:
hesham said:
hesham said:
Hi Flitzer,

the drawing which I saw from four years was to jet engined bomber,and
this drawing for G10N bomber project.


As I know the G12 was a jet bomber project.
Very interesting story, did the designation for the projected jet bomber realy exist? and if there was a specification for such bomber
how many engines or what type jetengine was planned for this aircraft?
are there artist impressions existing of the G12 bomber?


I remember that I made a topic about G12 bomber project,and we discussed
all thing about it.
 

Stargazer2006

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hesham said:
I remember that I made a topic about G12 bomber project,and we discussed all thing about it.

If you did, by all means share a link! I've never heard of a G12* (nor of a G11* for that matter...).
 

hesham

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Stargazer2006 said:
hesham said:
I remember that I made a topic about G12 bomber project,and we discussed all thing about it.

If you did, by all means share a link! I've never heard of a G12* (nor of a G11* for that matter...).


Of course in that great site,but I don't remember where ?.
 

blackkite

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Hi! Fujimi model's FUGAKU. Enjoy.
 

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blackkite

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Hi! I ordered this model to Fujimi Mokei again yesterday. The price for 4 set models is 12,000yen. Very very expensive.
 

blackkite

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Hi! I find this Fugaku turbo charged HA54 engine drawing in the following interesting site.
You can also find Fugaku drawing, etc, too. I believe these drawings are after war works.
Ed! How about these flying boats. ;D

http://ayumimoe.web.fc2.com/gallery.html
 

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Grey Havoc

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kantai131 seems to have been a very interesting take on the old bomber-transport concept.

Correction: On a closer look, it seems to have actually been a Transport/ASW hunter design
 

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