Nakadžima J5N1 18-Ši Tenrai

Nakajima J5N1 18-Shi Tenrai / 中島 J5N1 18-试「天雷」・ 十八試局地戦闘機
Nakadžima J5N1 18-Ši Nakajima J5N1 18-Shi
Originální název:
Original Name:
中岛 天雷 18-试
stíhací letoun fighter aeroplane
DD.MM.1944-DD.02.1945 Nakajima Aircraft Co., Ltd., Koizumi /
Období výroby:
Production Period:
Vyrobeno kusů:
Number of Produced:
První vzlet:
Maiden Flight:
Základní charakteristika:
Basic Characteristics:
Vzlet a přistání:
Take-off and Landing:
CTOL - konvenční vzlet a přistání CTOL - conventional take-off and landing
Uspořádání křídla:
Arrangement of Wing:
jednoplošník monoplane
Uspořádání letounu:
Aircraft Concept:
klasické conventional
zatahovací retractable
Přistávací zařízení:
Landing Gear:
kola wheels
Technické údaje:
Technical Data:
Hmotnost prázdného letounu:
Empty Weight:
5450 kg 12015 lb
Vzletová hmotnost:
Take-off Weight:
7350 kg 16204 lb
Maximální vzletová hmotnost:
Maximum Take-off Weight:
8205 kg 18089 lb
14,400 m 47ft 2,92in
11,500 m 37ft 8,75in
3,610 m 11ft 10,12in
Plocha křídla:
Wing Area:
32,00 m2 344.45 ft2
Plošné zatížení:
Wing Loading:
229,69 kg/m2 47.04 lb/ft2
pístový piston
Počet motorů:
Number of Engines:
Nakadžima NK9H Homare 21 (Ha-45-21) vzduchem chlazený dvouhvězdicový osmnáctiválec o vzletovém výkonu 1 464 kW (1 990 k), 1 375 kW (1 870 k) v h= 2 000 m a 1 250 kW (1 700 k) v h= 6 500 m
Vrtule čtyřlistá stavitelná s konstantní rychlostní otáček o průměru 3 100 mm
Nakajima NK9H Homare 21 (Ha-45-21) eighteen-cylinder air-cooled radial, rated at 1,963 hp for take-off, 1,844 hp at 6,562 ft and 1,677 hp at 21,325 ft,
driving a four-blade constant-speed metal propeller of 10ft 2in diameter.
Objem palivových nádrží:
Fuel Tank Capacity:
1 230 l 270.5 UK gallons
Maximální rychlost:
Maximum Speed:
607 km/h v 6200 m 377.2 mph in 20341 ft
Cestovní rychlost:
Cruise Speed:
464 km/h v 4000 m 288.3 mph in 13123 ft
Rychlost stoupání:
Climb Rate:
15,0 m/s 2952.8 ft/min
Čas výstupu na výšku:
Time to Climb to:
8,0 min do 6000 m 8,0 min to 19685 ft
Operační dostup:
Service Ceiling:
11800 m 38714 ft
925 km 574.8 mi
Maximální dolet:
Maximum Range:
1480 km 919.6 mi
2x kanón Type 5 ráže 30 mm zásoba nábojů v bubnových zásobnících 46 ks
2x kanón Type 99 model 2 ráže 20 mm

Pumový náklad:
1x puma 250 kg
Two forward-firing nose-mounted 1.81 in Type 5 cannons and
two forward-firing nose-mounted 0.79 in Type 99 Model 2 cannons.

External stores: One 551 lb bomb.
Uživatelské státy:
User States:
天雷 / Tenrai = Božský hrom (jap.)
中島十八試局地戦闘機 / - / Experimentální přepadový stíhač 18-Ši
TTD paltí pro první prototyp.
天雷 / Tenrai = "Heavenly Thunder" (jap.)
中島十八試局地戦闘機 / - / Experimental interceptor fighter 18-Shi
Data applies to first prototype
Rene J. Francillion PhD, Japanese Aircraft of the Pacific War, Naval Institute Press, rok 1987, ISBN-13: 978-0870213137
Tadeusz Januszewski a Kryzysztof Zalewski, Japońskie samoloty marynarski 1912-1945 díl 2, Lampart, rok 2000, ISBN 83-86776-00-05
archiv autora
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Nakajima J5N1 - 18 Shi

aj 島 十八 試 局 地 戦 闘 機 - Nakajima Experimental Assault Fighter 18-Shi

Japanese name: 天雷 - Tenrai - Divine Thunder (jap.)

Allied reporting name: unallocated

History and development:
In 1943, after the command of the Japanese Naval Air Force (ig 航空 本部 Kaigun Kōkū Hombu), the intelligence service was informed that the US Air Force was preparing to bomb the home islands and a massive bombing offensive was to be carried out by high-altitude bombers Boeing B-29 Superfortess, then the Navy found that in addition to obsolete aircraft Nakajima J1N1-C has no twin-engine fighter. In addition, the "Gekko" was not enough with its performance to speak of an effective fight against modern high-altitude bombers, such as the B-29.

In 1944, the Technical Department of the Naval Air Force formulated new requirements for a twin-engine single-seat fighter, these requirements were part of the specifications 18-Shi. The required fighter should be able to effectively fight the Superfortresses at their operational altitude. Work on the project of a new fighter was assigned to the company 中 島 飛行 機 株式会社 - Nakajima Hikōki Kabushiki Kaisha (hereinafter Nakajima). Its designers, led by engineers Katsuji Nakamura and Kazuo Ohn, began work on a project, first referred to as project B, and later changed to N-20. From the very beginning, the design took into account the simplest possible production technology and also easy maintenance in operation. The resulting project was an all-metal twin-engine glider, and its high performance was to be provided by engines Nakajima NK9H Homare 21 along with large four-bladed propellers. These engines were supposed to provide sufficient power, but unfortunately for the Japanese, they did not provide, despite all efforts and so Tenrai, such was the combat name of the new overflow fighter, did not achieve the planned performance. Homare engines from this period had one big deal - a sudden and unexpected drop in compressor charge pressure, and this drop reciprocally led to a rapid and significant loss of engine power. In addition to the problem engines, there were other serious problems with flying prototypes, such as directional instability, leaking hydraulics, and the Naval Air Command required stronger and more powerful passive protection, which would increase the weight of the machine. A total of six prototypes were produced, the first was flown in March 1944 and the last two aircraft, marked as J5N1 Kai, were completed as two-seater , the second crew member was an observer. This aircraft carried two cannons Type 5 caliber 30 mm in the fuselage, they fired at an angle of 60 ° upwards.

However, it is definitely not possible to say that everything on this aircraft was bad, the dexterity was, according to the test pilots, at a very good level and the view from the cabin of the aircraft was evaluated just as well. Single-seat aircraft carried under the cabin very effective armament in the form of two thirty-millimeter and two twenty-millimeter cannons. One aircraft had four thirty-millimeter type 5 cannons for testing. I must also point out that various types of weight can be obtained about this type of aircraft. the installation subsequently increased the weight of the aircraft. The sources I use vary by up to 150 kg. Very often the maximum speed is 621 km/h in 6,000 m, but no Tenrai has ever reached this speed, it is a calculated speed, the actual maximum speed was 596.45 km/h and the fastest was the first prototype, with which the maximum speed was reached. 607 km/h
The prototypes of Kaigun Kōkū Hombu were given the designation J5N1 and the combat name Tenrai - Sacred (Divine) Thunder (Japan).

Serial production was well prepared, despite unsatisfactory test results and delays in troubleshooting. Eventually, the Navy stopped the whole project, although at that time new versions of Homare engines were already available, for which the problem with the drop in boost pressure had already been solved, the new engines were tuned and much more reliable.

The Allies learned of the existence of this type only after the capitulation of Japan, when several specimens were found by one of the TAIU units, a code name was no longer assigned to this type.
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Doplním ještě několik zajímavých fotografií, nejzajímavější je ta spodní, na které je v popředí dvoumístná verze J5N1 Kai
Nakadžima J5N1 18-Ši Tenrai -

Nakadžima J5N1 18-Ši Tenrai -

Nakadžima J5N1 18-Ši Tenrai -

Nakadžima J5N1 18-Ši Tenrai -

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This post has not been translated to English yet. Please use the TRANSLATE button above to see machine translation of this post.

Obrázek Tenrai za letu zdroj server
barevné schéma - pohled z boku
Nakadžima J5N1 18-Ši Tenrai -

Nakadžima J5N1 18-Ši Tenrai -

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Sources used:
René J. Francillon Ph.D., Japanese Aircraft of the Pacific War, Naval Institute Press, Annapolis Maryland, Reprinted 1990, ISBN-0-87021-313-X
William Green, Warplanes of the Second World War, Volume Three, Fighters, London: Macdonald & Co.(Publishers) Ltd, 1961, ISBN 0-356-1447-9
Tadeusz Januszewski and Kryzysztof Zalewski, Japońskie samoloty marynarski 1912-1945, Volume 2, Lampart, year 2000, ISBN 83-86776-00-05
Bernard Millot, Le Chasseur Japonaise de la Deuxieme Guerre Mondiale, Paris, Docavia Vol. 7, Editions Lariviere, 1976.
Václav Němeček, Vojenská letadla 3., Naše vojsko, Prague 1992, 3rd supplemented edition, ISBN 80-206-0117-1
L+K 14/1982, Václav Němeček, Aircraft 1939-45, Nakajima J5N1 Tenrai
author's archive
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