Word: turboprop
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...Skyshark has a T40 Allison twin turboprop engine (5,500 h.p.) driving counterrotating propellers. The props give it high take-off thrust, and the gas turbines give it high power for low engine weight. After the take-off with a heavv load of bombs or fuel, the pilot can shut down one of the turbines and cruise at economically low speed. The Navy says that the Skyshark has "performance comparable with that of many operational jet fighters." Armed with rockets bombs, torpedoes, etc., it can support amphibious troops, as well as attack surface ships, may also turn...
...propellers used to weep into their blueprints every time a jet plane roared over the plant. They feared that the fierce little jets, which have no propellers, were the wave of the future. These days the prop designers are more cheerful. The performance of Allison's XT-4O turboprop engine (5,500 h.p.) has made many airplane companies think once more in terms of propellers. The prop men are sure that propellers, drastically redesigned, can keep up even with the fastest airplanes...
Hamilton's designers are sure that its new-style propellers will work efficiently even above the speed of sound. But their first jobs will probably be in subsonic turboprop fighters for use on carriers, where quick take-off is all-important. Other uses: long-range turboprop bombers and transports in the 4OO-500-mile speed range...
From Consolidated Vultee Aircraft Corp., G.M. bought a 40-passenger two-engined Convair 240, the same plane now flying many commercial routes. G.M. will equip the plane with two 2,750 h.p. turboprop engines developed by G.M.'s Allison division...
...addition, Britain has just finished the big, experimental 60-passenger turboprop, the Handley Page Hermes V, and is completing the giant Saunders-Roe Princess, a lo-engined turbo-prop flying boat designed to carry 105 passengers transocean to South America...