The Yokosuka H7Y (Allied reporting name: Tillie) (long designation: Yokosuka Experimental Kusho 12-shi Flying-boat) was a prototype Japanese flying boat of the Imperial Japanese Navy during the Second World War.
In 1937, the Imperial Navy of Japan formulated the technical task of the 12-Ci for the construction of a forward three- or four-engined flying boat. The maximum flight range was 9250 km with a bomb load of 1600 kg. Such a large range of flight was due to the desire of the fleet to cause torpedo-bombing strikes on the ships of the US Navy in Pearl Harbor without intermediate refueling at sea. The development of the aircraft was assigned to the design team of the 1st Fleet Arsenal in Yokosuka, headed by Jun Okamura.
The project was carefully classified, no one except the developers knew about it. However, it is known that the H7Y was four-engined, with Junkers Jumo 205C radial engines, which were purchased in Germany. In addition, Japanese designers studied the development of the German aircraft Dornier Do 26.[1]
The first and only prototype was built in 1939. It was a flying boat with a high-placed wing and four engines. The designers attached great importance to the aerodynamic characteristics of the aircraft, so the fuselage, wing and engine bonnet had a minimum number of protruding parts. To increase the range, it was necessary to donate a defensive weapon. The H7Y was intended to conduct reconnaissance missions over Hawaii from Micronesia.[2]
In the course of flight tests, the H7Y, which was as light as possible, showed unsatisfactory results. The fuselage was not tight enough. During the take-off, the wings were too dangerous to fluctuate. Due to the lack of engine power, taking off from the water was difficult. Attempts by the designers to reinforce the structure of the glider led to an increase in mass, which made it impossible to reach the Hawaiian Islands without refueling. And with refueling in the sea from submarines strike at Pearl Harbor could design a flying boat Kawanishi H8K, which could carry a significant bomb load and was well protected. Thus, in 1940, the Yokosuka H7Y program was cancelled.[3]
Although the Yokosuka H7Y project was extremely secretive, TAI gave it the codename name "Tillie".
^ abMikesh, Robert; Shorzoe Abe (1990). Japanese Aircraft 1910–1941. London: Putnam. pp. 281–282. ISBN0-85177-840-2.
January 06, 2023
yokosuka, allied, reporting, name, tillie, long, designation, yokosuka, experimental, kusho, flying, boat, prototype, japanese, flying, boat, imperial, japanese, navy, during, second, world, h7yrole, flying, boatmanufacturer, yokosukafirst, flight, 1939primary. The Yokosuka H7Y Allied reporting name Tillie long designation Yokosuka Experimental Kusho 12 shi Flying boat was a prototype Japanese flying boat of the Imperial Japanese Navy during the Second World War H7YRole Flying boatManufacturer YokosukaFirst flight 1939Primary user Imperial Japanese Navy Air Service IJNAS Number built 1 Contents 1 Development 2 Specifications 3 Notes 4 ReferencesDevelopment EditIn 1937 the Imperial Navy of Japan formulated the technical task of the 12 Ci for the construction of a forward three or four engined flying boat The maximum flight range was 9250 km with a bomb load of 1600 kg Such a large range of flight was due to the desire of the fleet to cause torpedo bombing strikes on the ships of the US Navy in Pearl Harbor without intermediate refueling at sea The development of the aircraft was assigned to the design team of the 1st Fleet Arsenal in Yokosuka headed by Jun Okamura The project was carefully classified no one except the developers knew about it However it is known that the H7Y was four engined with Junkers Jumo 205C radial engines which were purchased in Germany In addition Japanese designers studied the development of the German aircraft Dornier Do 26 1 The first and only prototype was built in 1939 It was a flying boat with a high placed wing and four engines The designers attached great importance to the aerodynamic characteristics of the aircraft so the fuselage wing and engine bonnet had a minimum number of protruding parts To increase the range it was necessary to donate a defensive weapon The H7Y was intended to conduct reconnaissance missions over Hawaii from Micronesia 2 In the course of flight tests the H7Y which was as light as possible showed unsatisfactory results The fuselage was not tight enough During the take off the wings were too dangerous to fluctuate Due to the lack of engine power taking off from the water was difficult Attempts by the designers to reinforce the structure of the glider led to an increase in mass which made it impossible to reach the Hawaiian Islands without refueling And with refueling in the sea from submarines strike at Pearl Harbor could design a flying boat Kawanishi H8K which could carry a significant bomb load and was well protected Thus in 1940 the Yokosuka H7Y program was cancelled 3 Although the Yokosuka H7Y project was extremely secretive TAI gave it the codename name Tillie Specifications EditData from Japanese Aircraft 1910 1941 4 General characteristicsCrew 4 Max takeoff weight 18 000 kg 39 683 lb Powerplant 4 Junkers Jumo 205C Note 1 6 cylinder water cooled opposed piston diesel engines 380 kW 510 hp each at 2 100 rpmPerformance Range 9 254 km 5 750 mi 4 997 nmi minimumArmament Guns 2 or 3 7 7 mm 0 303 in machine guns Bombs 1 600 kg 3 500 lb of bombs or 2x torpedoesNotes Edit Only two engines of this type were acquired by the Navy 4 References Edit Encyclopedia of Japanese Aircraft 1900 1945 Vol II Aichi Kugisho aircraft Shuppan Kyodo Publishers Japan 1966 Robinson 1979 Illustrated Encyclopedia of Aviation Volume 20 New York Marshall Cavendish Hiro H7Y1 12 Shi Tillie Info a b Mikesh Robert Shorzoe Abe 1990 Japanese Aircraft 1910 1941 London Putnam pp 281 282 ISBN 0 85177 840 2 Retrieved from https en wikipedia org w index php title Yokosuka H7Y amp oldid 1096737204, wikipedia, wiki, book, books, library,
