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==Design and development== |
==Design and development== |
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<pre> |
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Nakajima model |
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NAM NK1B Sakae Type 11 Ha-25 |
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NK1C Sakae Type 12 Ha-25 |
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NK1E Sakae Type 21 Ha-115 |
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NK1F Sakae Type 21 Ha-115 |
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NAL Type 97 850 hp Ha-5 |
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Type 100 1250 hp Ha-41 |
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Type 2 1450 hp Ha-109 |
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NAL-6 NK5A |
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NAK NK7A Mamori Type 11 |
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NK7A Mamori Type 12 Ha-103 |
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NBA NK9B Homari Type 11 Ha-45 Type 11 |
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NK9H Homari Type 21 Ha-45 Type 21 |
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NBH Ha-44 |
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NAR Ha-17 |
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NBD Ha-107 |
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Ha-117 |
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Ne-230 |
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From http://www.ww2aircraft.net/forum/engines/nakajima-nk7a-mamoru-23468.html |
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The first prototype G5N1 made its maiden flight on 10 April 1941. Overall performance proved disappointingly poor however, due to a combination of excessive weight, the unreliablity of the Mamoru 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 Mamoru 11s, the aircraft was now even more hopelessly underpowered and further development of the type was halted. |
The first prototype G5N1 made its maiden flight on 10 April 1941. Overall performance proved disappointingly poor however, due to a combination of excessive weight, the unreliablity of the Mamoru 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 Mamoru 11s, the aircraft was now even more hopelessly underpowered and further development of the type was halted. |
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<!-- ==Operational history== --> |
<!-- ==Operational history== --> |
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==Variants== |
==Variants== |
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* Nakajima NK7A Mamoru 11 1,870 hp (1395 kW) (IJN aircraft) |
* Nakajima NK7A Mamoru 11 1,870 hp (1395 kW) (IJN aircraft) |
Revision as of 01:09, 15 July 2011
Nakajima Mamoru | |
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Type | |
Manufacturer | Nakajima |
Major applications | Nakajima G5N Nakajima B6N |
Design and development
Nakajima model NAM NK1B Sakae Type 11 Ha-25 NK1C Sakae Type 12 Ha-25 NK1E Sakae Type 21 Ha-115 NK1F Sakae Type 21 Ha-115 NAL Type 97 850 hp Ha-5 Type 100 1250 hp Ha-41 Type 2 1450 hp Ha-109 NAL-6 NK5A NAK NK7A Mamori Type 11 NK7A Mamori Type 12 Ha-103 NBA NK9B Homari Type 11 Ha-45 Type 11 NK9H Homari Type 21 Ha-45 Type 21 NBH Ha-44 NAR Ha-17 NBD Ha-107 Ha-117 Ne-230 From http://www.ww2aircraft.net/forum/engines/nakajima-nk7a-mamoru-23468.html The first prototype G5N1 made its maiden flight on 10 April 1941. Overall performance proved disappointingly poor however, due to a combination of excessive weight, the unreliablity of the Mamoru 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 Mamoru 11s, the aircraft was now even more hopelessly underpowered and further development of the type was halted. Nakajima B6N Jillradial engine driving a four bladed Hamilton 135 production Tenzan (heavenly mountain) aircraft had been delivered a new crisis arose when Nakajima was ordered to terminate manufacture of the Mamoru engine, and use the more reliable 1,850 hp (1380 kW) Mitsubishi MK4T Kasei 25 engineVariants
* Nakajima NK7A Mamoru 11 1,870 hp (1395 kW) (IJN aircraft) * Nakajima NK7A Mamoru 12 Ha103 1 1,870 hp (1395 kW) (IJA aircraft)Applications
* Nakajima B6N 1 X 1,870 hp (1395 kW) Nakajima NK7A Mamoru 11 * Nakajima G5N 4 X 1,870 hp (1395 kW) Nakajima NK7A Mamoru 11 * Nakajima Ki-49 2 X 1,870 hp Nakajima Ha-103 * Mitsubishi Ki 67 (prototype) 1 X 1,870 hp Nakajima Ha-103 http://japaneseaircraft.devhub.com/blog/585641-nakajima-g5n/Specifications (Nakajima NK7A Mamoru type 11 )
Data from Francillon p 433
General characteristics
*Type: 14-cylinder, supercharged, air-cooled radial piston engine *Bore: 155 mm *Stroke: 170 mm *Displacement: 44.9 L *Length: 1,816 mm *Diameter: 1,380 mmComponents
*Valvetrain: 4-valve pushrod operated overhead valve system *Supercharger: centrifugalPerformance
*Power output: 1400 kW (1850 hp) *Compression ratio: Ratio: 6.5References
Bibliography
* Francillon, Ph.D., René J. Japanese Aircraft of the Pacific War. London: Putnam & Company Ltd., 2nd edition 1979. ISBN 0-370-30251-6. pg 425External links
http://www.aviastar.org/air/japan/nakajima_g5n.php