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A polo neck, roll-neck [1] (South Africa), turtleneck (United States, Canada), or skivvy is a garment—usually a sweater—with a close-fitting collar that folds over and covers the neck. It can also refer to the type of neckline, the style of collar itself, or be used as an adjective ("polo necked").
The A-10 engines now have a self-sustaining combustion section. When the gun is fired, the igniters come on to reduce the possibility of a flameout. [20] The average recoil force of the GAU-8/A is 10,000 pounds-force (45 kN), [5] [21] which is slightly more than the output of each of the A-10's two TF34 engines of 9,065 lbf (40.3 kN). [22]
The General Electric I-A was the first working jet engine in the United States, manufactured by General Electric (GE) and achieving its first run on April 18, 1942.. The engine was the result of receiving an imported Power Jets W.1X that was flown to the US from Britain in 1941, and the I-A itself was based on the design of the improved Power Jets W.2B, the plans of which were also received.
All practical airbreathing jet engines heat the air by burning fuel. [1] Alternatively a heat exchanger may be used, as in a nuclear-powered jet engine. [6] Most modern jet engines are turbofans, which are more fuel efficient than turbojets because the thrust supplied by the gas turbine is augmented by bypass air passing through a ducted fan. [4]
The General Electric J85 is a small single-shaft turbojet engine. Military versions produce up to 3,500 lb f (16 kN ) of thrust dry; afterburning variants can reach up to 5,000 lb f (22 kN). The engine, depending upon additional equipment and specific model, weighs from 300 to 500 pounds (140 to 230 kg).
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However, the GE/PW engine increased its share of the A380 engine market to the point where, as of September 2007, it will power 47% of the super-jumbo fleet. This disparity in sales was resolved in a single transaction, with Emirates ' order of 55 GP7000-powered A380-800s, comprising over one quarter of A380 sales (as of September 2007).