From "(FUGAKU)" ,Author:Maema Takanori,Kodansha Tokyo
published in 1991.ISBN4-06-205543-0 C0095 P2000E(0) No.(1)
In November 1942, Chikuhei Nakajima called twenty Nakajima's elite engineers to the Nakajima club, explained that
Japan would lost the war by strategic bombing to Japan using B-29 and B-36 from 1944.(He already knew B-36 at the day!)
The only way to win the war was strategic bombing to the United States by transoceanic large
bomber with 5,000hp engines, which speed was higher than American fighter.
This plan was already explained to the JIJA and IJN.
Study how to realize this bomber as the secret private venture, keep secret.
Named secret study party as “Winning game, guard Japanese sky research party ”, leader was chief engineer Satoshi Koyama.
Then the conceptual design began by the secret party, the chief of fuselage study was Shinobu Mitake (Shinzan chief designer), the chief of engine study was Tanaka Kiyoshi ,Mamori engine and NBD engine chief designer). The engine designing team started discussion between Kotani (Section manager), Tanaka, Nakagawa chief designer of Homare engine), Inoue and Kudo . They discussed about several engine types.
Tanaka and Kudo recommended 4 array 36 cylinder HA54 engine.(tandem double HA44 engine)
BTW Nakagawa argued against this engine that cooling would be the big problem, too risky.
Nakagawa insisted 4,000hp 26 cylinder!!(2 array 13 cylinder) engine which diameter was rather
bigger than HA54. Finally Tanaka and Inoue agreed Nakagawa's plan. The 26 cylinder engine plan
was explained to Chikuhei by Koyama. BTW Chikuhei rejected this 4,000hp engine and ordered to Koyama ”Don't be less than only 1hp from 5,000hp”.
Mitake studied 26 aircraft types based on Chikuhei's idea for the answer of Chikuhei's order.
They were from small plane to large plane, carrier base bomber, torpedo bomber, attack bomber, twin engine bomber, long range bomber, gun ship and cargo plane. At the time, Nakajima's design for the aircraft were based on British R&W report and NACA's report for wing section. Yasuo Naito(Desiger of Saiun's laminar flow wing and past war T-1 trainer) made his own chart for the aircraft basic design from the British R&W report and NACA's report. Naito helped Mitake's study, he thought that among 26 types, the final 3 types were very difficult to design. They were very big long range bomber, gun ship which had 20 cannon located under the fuselage to shoot American fighter and cargo plane to carry soldiers to the United States.
Finally Mitake and Naito merged these 26 types into one long range bomber.
From "(FUGAKU)" ,Author:Maema Takanori , No.(2)
The results of basic design for Z-plane(Final Z-plane) performed by Satoshi Koyama,Yasuo Naito,etc in Nakajima club in 1943/4?1943/6 were as follows.
Wing span:65m, Length:45m, Height:12m, angle of ground position:9 degree?, Wing area:350m2, Maximum wing chord length:9m, Dihedral:3.5 degree, aspect ratio:12, Taper ratio:1:5, angle of incidence:6 degree, horizontal tail stabilizer area:60m2, Vertical tail stabilizer area:40m2,Distance between main wheels:9m, Fuselage fuel tanks capacity;42,720L, Wing fuel tanks capacity:57,200L,
Wing loading:457kg/m2, Power loading:5.3kg/hp, Empty weight:67.3ton, MTOW:160ton, Engine:six double BH(HA54) 5,000hp in take off, 4,600hp/7,000m, Propeller:3 blade contra rotating 4.8m diameter, Maximum speed:680km/h/7,000m, Service ceiling:12,480m, Take off run:1,200m, Range:16000km with 20 ton bomb.
From "(FUGAKU)" ,Author:Maema Takanori, Yoshiro Ikari, No.(6)
In fall of 1943, there were four plans which could bombing the United States. They were Nakajima
Z-plane, Kawanishi TB, Kawasaki Ki-91 and Tachikawa Ki-74?, the IJA and the IJN confused very much. Finally the IJA and IJN Aviation technology committee asked Chikuhei Nakajima to be the chairman of Fugaku committee in 24th of November 1943. In 26th of January 1944, the IJN
held the meeting to compare with Fugaku and TB. The specifications of Fugaku and TB were
as follows.(Source:Ministry of Defense official documents) The IJA held same meeting in 27th of January.
[Fugaku]: Wing span:61m, Wing area:310m2, Range:18,500km with 5ton bomb, Service ceiling:15,000m, Armament:13mm gun×1, 20mm cannon×3, Max speed:700km/h(15,000m), MTOW:116ton, Takeoff run:1,500m, Engine:Nakajima modified six HA219(HA44) ,2340hp in 15,000m.
[TB]: Wing span:52.5m, Wing area:220m2, Range:23,700km with 2ton bomb, Service ceiling:12,000m, Crew:6, Armament:13mm gun×4, Max speed:600km/h(12,000m), MTOW:74ton, Takeoff run:1,900m, Engine:Perhaps Mitsubishi modified four HA214(HA42) or HA211(HA43).
From "(FUGAKU)" ,Author:Maema Takanori Yoshiro Ikari, No.(7)
From January 1944, almost all design managers of Nakajima Aircraft concentrated Fugaku design in parallel with other aircraft design for example Renzan design. The Fugaku design team were consisted of 200 engineers including Mitsubishi and Kawasaki's engineers, 40% engineers were from the IJA and the IJN's aviation technology institute, worked as computers.
In the middle of March 1944, the IJA and IJN joint meeting was held to compare with Fugaku, TB and Ki-74?. Finally Fugaku was selected as the United States bombing aircraft, settled following two plans. HA54 engine was judged too risky. But Nakajima Aircraft kept development of HA54.
[The first plan] Wing area:330m2, Range:18,200km with 10ton bomb, 21,200km with 5ton bomb,Service ceiling:15,000m, Armament:20mm cannon×24, Max speed:640km/h(12,000m), MTOW:122ton, Takeoff run:1,700m, Engine:Nakajima modified six HA219(HA44) ,2500hp in take off, 2,050hp in 7,000?15,000m. Take off run:1,700m. Wing loading:370kg/m2
[The second plan] Wing area:330m2, Range:16,500km with 10ton bomb, 19,400km with 5ton bomb,Service ceiling:15,000m, Armament:20mm cannon×24, Max speed:700km/h(12,000m), MTOW:122ton, Takeoff run:1,200m, Engine:Mitsubishi six HA50, 3300hp in take off, 2,370hp in 10,400m. Take off run:1,200m. Wing loading:370kg/m2 (1) 1943/1/28 : 4 engine and 6 engine large bomber plan(including gun ship variant and cargo variant) was made by Nakajima aircraft
private venture.(Engine was HA177,Mamori engine variant? Take off power is unknown.)
(2) 1943/2/16 : 4 engine and 6 engine large bomber plan was made by Nakajima aircraft private venture.(Engine was double BH(HA54),take off power was 4,400hp each.)
(3) 1943/3/5 : Temporary 6 engine(HA44,take off power was 2,600hp each) bomber plan(including cargo
variant) was made by Nakajima aircraft.
(4) 1943/4 1943/6 : Basic design for Z-plane was performed by Satoshi Koyama,Yasuo Naito,etc
in Nakajima club.
(5) 1943/6/8 : 'Z-plane design explanation' was made by Nakajima aircraft.(final Z-plane plan)
(6) 1943/8 : 'Winning strategy or Winning game plan' was made by Chikuhei Nakajima.
(7) 1943/9 : Z-plane was selected as IJN and IJA joint research program, IJN insisted that service
ceiling was 15,000m with light armament, IJA insisted that service ceiling was 10,000
with heavy armament. Finally IJN's plan was selected with range was
18,520km(15,000n.m)
(8.) 1944/1 : IJN and IJA compared with Fugaku and Kawanishi TB, selected Fugaku, although JJN
hoped TB.
(9) 1944/1 : Named this plane as Fugaku. Established Fugaku committee, chairman was
Chikuhei Nakajima, members were Kugisho, IJA aircraft technology research institute,
Central aircraft research institute, Tokyo imperial university, Nakajima Aircraft,
Mitsubishi Aircraft, Sumitomo Metal and Hitachi.
(10) 1944/3/14 : Fugaku committee offered to IJN and IJA following two stage developing plan for
Fugaku because of the delay of HA54 development.
Realize HA44 engine×6 bomber.
Realize HA54 engine×4 bomber or HA50 engine×6 bomber.
(11) 1944/8 : IJN and IJA stopped Fugaku project followed the fall of Saipan island .
(https://www.sas1946.rocks/images/imageshit/img69/9335/ih8n.jpg)
(https://www.sas1946.rocks/images/imageshit/img9/3559/569r.jpg)
The planes get my vote too... the G8N could have been the japanese counterpart to the B-29 if things where differently. But the G10N1 is something of a myth. It was the end of the long G-row of big bombers. Propably the japanese themselves didn't know what they would make out of it in the end. There where acutally several designs for a 'Fugaku'...Thank Batbomb . Exactly what I meant when I wrote this request.
+1 vote!Thanks Cally18. Would be great to see someday these two birds in the game.
I have quite a few pictures of WW2 planes that were in prototype form that i want to submit, and this was one of them! Very well done mate!
93.6 lb/sqft wing loading! Good Lord! How the hell does that thing even get off the ground. and at around 30 lb/sqft the B-29 was thought to be insanely heavy! +1 and all that, but God!If it leaves the ground, put one .50 caliber round in the wing root to send it back where it came from :D
I also think that to this request should be added plane G5N Shinzan (Liz) (http://en.wikipedia.org/wiki/Nakajima_G5N). :)
| The Nakajima G5N Shinzan (??"Mountain Recess") was a four-engined long-range heavy bomber designed and built for the Imperial Japanese Navy prior to World War II. The Navy designation was "Experimental 13-Shi Attack Bomber"; the Allied code name was "Liz". |
Role Heavy bomber
Manufacturer Nakajima Aircraft Company
First flight 8 April 1941[1]
Retired 1945
Primary user IJN Air Service
Produced 6
2 of G5N1
4 of G5N2
Developed from Douglas DC-4E | The Nakajima G5N Shinzan originated due to the Imperial Japanese Navy's interest in developing a long-range attack bomber capable of carrying heavy loads of bombs or torpedoes a minimum distance of 3,000 nmi (5,600 km; 3,500 mi). To meet this requirement, it became apparent a four-engine lay-out would be necessary. As Japanese aircraft manufacturers lacked experience in building such large complex aircraft, the Navy was forced to search for a suitable existing foreign-made model upon which to base the new design. It settled on the American Douglas DC-4E airliner. In 1939 the sole prototype of this airliner (previously rejected by American airline companies) was purchased by Nippon Koku K.K. (Japan Airlines Co) and clandestinely handed over to the Nakajima Aircraft Company for dismantling and inspection.[2] The design that emerged from this study was for an all-metal mid-wing monoplane with fabric-covered control surfaces and powered by four 1,870 hp Nakajima NK7A Mamori 11 air-cooled radial engines driving four-bladed propellers. Notable features included a long ventral bomb-bay, glazed nose and twin tailfins replacing the DC-4E's distinctive triple rudder. The DC-4E's retractable tricycle undercarriage was retained, as well as the original wing form and powerplant arrangement. Defensive armament comprised one 20mm Type 99 Model 1 cannon each in a power-operated dorsal and tail turret plus single-mount hand-operated 7.7mm Type 92 machine guns in the nose, ventral and waist positions.[3] The first prototype G5N1 made its maiden flight on 14:35 8 April 1941.[1] Overall performance proved disappointingly poor however, due to a combination of excessive weight, the unreliability of the Mamori engines and the complexity of the design. Only three more prototypes were completed. In an attempt to salvage the project, two additional airframes were fitted with 1,530 hp Mitsubishi MK4B 12 "Kasei" engines and redesignated G5N2s. Although the Mitsubishi engines were more reliable than the original Mamori 11s, the aircraft was now even more hopelessly underpowered and further development of the type was halted.[3] |
| Of the six completed Shinzans, four of them were relegated for use as long-range Navy transports under the designation G5N2-L Shinzan-Kai Transport. The Allies allocated the code-name "Liz" to the aircraft, in the expectation it would be used as a bomber.[3] |
G5N1 Experimental Type 13 Land-based Attack Bomber "Shinzan" (13?????? ?? 13-Shi Rikuj? K?gekiki "Shinzan")
Prototype, two built. Initial named Experimental Type 13 Large-size land-based Attack Bomber (13???????? 13-Shi ?gata Rikuj? K?gekiki). Four-engined heavy bomber/torpedo bomber. Three-blade propeller, mounted four Mitsubishi MK4B Kasei 12 (1,530 hp) radial engines.
G5N2 Test production "Shinzan Kai" (????? Shisei "Shinzan Kai")
Supplementary prototype, four built. Four-blade propeller, mounted four Nakajima NK7A Mamori 11 (1,870 hp) radial engines. All G5N2s were rebuilt to G5N2-L in 1943.
G5N2-L "Shinzan Kai" Freighter (?????? "Sinzan Kai" Yus?ki)
Long-range Navy transport conversion. All G5N2-Ls were deployed to 1021st K?kutai, Katori Air Base.
Nakajima Ki-68
Proposed Army bomber prototype version of the G5N1. Engines were planned Mitsubishi Ha-101, Ha-104, Ha-107, Nakajima Ha-39 or Ha-103 engines. Discontinued in 1941.
Kawasaki Ki-85
Proposed Army bomber version of the G5N1. Four Mitsubishi Ha-111M engines. Full scale mock-up was built in 1942, discontinued in May 1943. Japan
Imperial Japanese Navy Air Service[5]
1021st K?kutai Data from Japanese Aircraft of the Pacific War[3]Famous airplanes of the world (1984)[4]
General characteristics
Crew: 7 (G5N1/2), 6 (G5N2-L)
Length: 31.02 m (101 ft 9 in)
Wingspan: 42.12 m (138 ft 2 in)
Height: 8.8 m (27 ft 6 in)
Wing area: 201.8 m² (2,171.37 ft²)
Empty weight: 20,100 kg (44,300 lb)
Loaded weight: 28,150 kg (62,060 lb)
Max. takeoff weight: 32,000 kg (70,528 lb)
Powerplant: 4 × Nakajima NK7A "Mamori-11" 14-cylinder air-cooled radial Sumitomo/Hamilton four-blade constant-speed, 1395 kW (1870 hp) each
Performance
Maximum speed: 420 km/h (227 kn, 261 mph)
Cruise speed: 278 km/h (150 kn, 173 mph, G5N1)
Range: 4,260 km (2,302 nmi, 2,648 mi)
Service ceiling: 7,450 m (24,442 ft)
Armament
Guns
2× 20 mm Type 99 cannons
4× 7.7 mm (0.303 in) Type 92 machine guns
Ordnance
2,000-4,000 kg (4,408-8,816 lb) bombs or torpedoes
2× 1,500 kg torpedoes
2× 1,500 kg bombs
4× 800 kg bombs
12× 250 kg bombs
24× 60 kg bombs
4,000 kg freight (G5N2-L)
I found it First.
Any news on this project?Some time ago I have sent "stand-in" B-29 slots with 6 engines (B-36) / +CRP (G10N) to 101tfs, didn't hear anything since then.