| 词条 | J-class blimp | |||||||||||||||
| 释义 |
The J-class blimps were non-rigid airships designed by the Navy Bureau of Aeronautics and Goodyear Tire & Rubber Company in the early 1920s for the US Navy. Design and developmentDesigned in 1919, the J-type were to be improvements upon the D-type. Improvements included a smaller envelope (174,800 cu ft), more powerful engines, a new, simple boat style control car capable of water landings and a single ballonet to reduce weight as tried in the H-1. Two airships, designated J-1 and J-2, were ordered. J-1 first flew 31 August 1922 at Wingfoot Lake. The J-1 was operated at Hampton Roads until airship operations there were terminated in 1924. From May 1924 the J-1 served at Lakehurst, and was at that time the Navy's only active blimp. Due to the single ballonet, the J-1 proved difficult to handle. J-1 was retired in August 1924. J-2 was cancelled due to the failure of the single ballonet J-1, with the car being stored at the Naval Aircraft Factory. J-3 was assembled from an Army TC type envelope and control car, modified to suit the Navy. Instrumentation came from the J-1. The J-3 first flew 12 October 1926. Lakehurst was the only naval air station which the J-3 served at. Its role was to train crews for the ZR-3 and ZRS-4 and 5. The J-3 was lost on April 4, 1933 during a forced landing while searching for survivors of the Navy rigid airship {{USS|Akron|ZRS-4}} with the loss of 2 out of the blimp's crew of 7.[1] Rescue was made by a United States Coast Guard and New York Police Department amphibians. J-4 utilized the J-2 control car, modified by enclosing it, and a TC-type envelope. It was test flown in November 1927. The J-4 served as a trainer at Lakehurst until it was sent to Sunnyvale in the summer of 1933. After the Army took over Sunnyvale, the J-4 was returned to Lakehurst in May 1935. The J-4 was stricken from the Navy registry in March 1940. The J-class blimps were equipped with a control car that was suspended externally from the envelope. Utilizing helium for lift, the envelope capacity was {{convert|210000|cuft|m3|abbr=on}}. Two radial engines powered the blimp. Operators
Specifications (J-3 and J-4){{aerospecs|met or eng?=eng |crew=5-6 |capacity= |length m=59.76 |length ft=196 |length in=0 |span m= |span ft= |span in= |swept m= |swept ft= |swept in= |rot number= |rot dia m= |rot dia ft= |rot dia in= |dia m=13.57 |dia ft=44 |dia in=6 |height m=17.68 |height ft=58 |height in=0 |wing area sqm= |wing area sqft= |swept area sqm= |swept area sqft= |rot area sqm= |rot area sqft= |volume m3=5,964 |volume ft3=210,600 |aspect ratio= |empty weight kg= |empty weight lb= |gross weight kg= |gross weight lb= |lift kg=2,087 |lift lb=4,600 |eng1 number=1 |eng1 type=Union |eng1 kw=97 |eng1 hp=130 |eng1 kn= |eng1 lbf= |eng1 kn-ab= |eng1 lbf-ab= |eng2 number= |eng2 type= |eng2 kw= |eng2 hp= |eng2 kn= |eng2 lbf= |eng2 kn-ab= |eng2 lbf-ab= |max speed kmh=96 |max speed mph=60 |max speed mach= |cruise speed kmh=74 |cruise speed mph=46 |range km=1,556 |range miles=970 |endurance h=52 |endurance min= |ceiling m=2,439 |ceiling ft=8,000 |glide ratio= |climb rate ms= |climb rate ftmin= |sink rate ms= |sink rate ftmin= |armament1= |armament2= |armament3= |armament4= |armament5= |armament6= }} See also{{aircontent|related= |similar aircraft= |lists=
|see also= }} References1. ^
3 : United States patrol aircraft 1920–1929|Airships of the United States Navy|Goodyear aircraft |
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