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Rolls-Royce brings propeller engines back in vogue
On 22 Okt, 00:37, "Jeff Hacker" wrote:
wrote in message ... On 21 Okt, 14:04, James Robinson wrote: "True Blue" wrote: A staggering article. The Guardian makes a fool of itself yet again. Turboprops with or without counter-rotating propellers have been used extensively, in many parts of the world, for many years. Yet The Guardian report this as a new-found technology which will "save the planet". They should stick to the arts. Except they aren't talking about traditional turboprops. They are describing a propfan, or unducted fan engine, "Unducted fan" is a bit of a misnomer. Traditionally the fan refers to the big cold whirry thing at the front rather than than small hot whirly thing at the back. not necessarily. *Remember the Convair 990 Coronado, which had what they called "Aft-Fan" engines. Ooh.. I had to look that up - thanks for eduataing me! I always assumed the engines were more-or-less non afterburning J79s but infact, as you say, they stuck an extra fan at the back (after the turbine?). I'm having difficulty seeing how that would work - presumably there was some sort low velocity of by-pass from the compressor that it used to produce more thrust - or was it using exhaust gasses? Can't get my head around it... |
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