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Rolls-Royce brings propeller engines back in vogue



 
 
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Old October 22nd, 2008, 10:25 AM posted to rec.travel.europe,uk.politics.misc,rec.travel.air
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Default 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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