CFM56--what next? All options are open, as GE and Snecma prepare the...

Interavia Business & Technology;  June 22, 2007 ;   Julian, Francois Beauclair, Nicole;   787 words ......rest, he says, will be new. Increased bypass ratio All the studies that have been performed...programme point to the need for a greater bypass ratio: greater than 10 for a traditional turbofan...open rotor architecture. The higher the bypass ratio, the better the efficiency. Also, ...

CFM56 - what next?

Interavia;  July 1, 2007 ;   Julian, François; Beauclair, Nicole;   787 words ......he says, "will be new." Increased bypass ratio All the studies that have been performed...programme point to the need for a greater bypass ratio: greater than 10 for a traditional turbofan...open rotor architecture. The higher the bypass ratio, the better the efficiency. Also, the...

New fans for new RJs.(regional jets)(Brief Article)(Statistical Data...

Interavia Business & Technology;  April 1, 2001 ;   SUTTON, OLIVER;   787 words ......turbine, a fan diameter of 46.2in, a bypass ratio of 5 and a pressure ratio of 28. GE...blades and a three-stage booster, a bypass ratio of 5 and pressure ratio of 29. The compressor...2inch wide chord, damperless fan, and a bypass ratio of 4.2. The engine features a simple...

PRATT & WHITNEY; JT9D MARKS 25 YEARS OF SERVICE

PR Newswire;  January 19, 1995 ;     303 words ......was the first commercial turbo fan with a high bypass ratio. The engine's fan diameter of 92 inches was equal...the length of the whole engine. This provided a bypass ratio of five-to-one; five times as much air passed around...

New fans for new RJs

Interavia;  April 1, 2001 ;   Sutton, Oliver;   787 words ......turbine, a fan diameter of 46.2in, a bypass ratio of 5 and a pressure ratio of 28. GE...blades and a three-stage booster, a bypass ratio of 5 and pressure ratio of 29. The compressor...2inch wide chord, damperless fan, and a bypass ratio of 4.2. The engine features a simple...

Old heads oversee new design. (retired experts in product development)

Mechanical Engineering-CIME;  February 1, 1992 ;   Barr, Vilma;   787 words ......five-year development program that will put a 10:1 bypass ratio turbofan engine into the air by 1995. To help...Its 123-inchdiameter fan will provide a 10:1 bypass ratio, compared with a bypass ratio of 5:1 for today's engines. Moving in Together...

P&W gears up for engine offensive

Interavia;  March 1, 1998 ;   Sweetman, Bill;   440 words ......breaks new ground in having a gear-driven fan and a higher bypass ratio than any current engine (11:1, versus 9:1 for the GE90...in the early 1990s, but it is not an ADP. It has a lower bypass ratio and a higher fan pressure ratio, which eliminates the need...

Battlespace 2000 in big engines.(aircraft engine market...

Interavia Business & Technology;  September 1, 1999 ;   SUTTON, OLIVER;   787 words ......PW4000 (94-inch fan), which has a bypass ratio of 5:1 and a fan pressure ratio of 1.80:1, the PW8000's bypass ratio is doubled, at 10:1, and the fan...of today's engines. However with a bypass ratio of 10:1 the PW8000's fan speed will...

Battlespace 2000 in big engines

Interavia;  September 1, 1999 ;   Sutton, Oliver;   787 words ......PW4000 (94-inch fan), which has a bypass ratio of 5:1 and a fan pressure ratio of 1.80:1, the PW8000's bypass ratio is doubled, at 10:1, and the fan...of today's engines. However with a bypass ratio of 10:1 the PW8000's fan speed will...

The turbofan of tomorrow.

Mechanical Engineering-CIME;  August 1, 1990 ;   Brines, Gerald L.;   787 words ......air around and through the engine. The bypass ratio is the ratio of air passing through...are required to make a 10:1 to 20:1 bypass ratio advanced ducted engine a reality. Pratt...stages. For example, a geared fan with a bypass ratio of 14:1 can be driven by a three-stage...

Pratt & Whitney's surprise leap

Interavia;  June 1, 1998 ;   Sweetman, Bill; Sutton, Oliver;   787 words ......having a gear-driven fan and a higher bypass ratio than any current engine ( I , versus...30dB below current rules and the high bypass ratio boosts propulsive efficiency and reduces...but it is not an ADP. It has a lower bypass ratio and a higher fan pressure ratio, which...

Pratt & Whitney's surprise leap. (starts design of PW8000 engine)(Turf...

Interavia Business & Technology;  June 1, 1998 ;   Sweetman, Bill Sutton, Oliver;   787 words ......having a gear-driven fan and a higher bypass ratio than any current engine (11:1, versus...30dB below current rules - and the high bypass ratio boosts propulsive efficiency and reduces...but it is not an ADP. It has a lower bypass ratio and a higher fan pressure ratio, which...

The advocate general.(recommends court invalidate European Commission's...

Air Transport World;  November 1, 2001 ;     113 words ......invalidate the European Commission's restriction on operation of aircraft that have been re-engined with powerplants having a bypass ratio of less than 3:1. The court is expected to issue a final ruling before year end. Usually it accepts the rulings of the advocate...

New airplane engines include something old and something new. (high-thrust...

R & D;  June 1, 1990 ;     627 words ......operation. The PW4000 has a pressure ratio of 31.5:1 and a bypass ratio of 5:1 in its present 60,000-lb thrust form. The first version...thrust and will have a pressure ratio of 45 to 50:1 and a bypass ratio of almost 10:1. This is well above the company's current...

Senator Warns EU On Banning Aircraft Airlines Risk U.S. Reprisals, McCain...

International Herald Tribune;  April 19, 1999 ;   Mitchell Martin;   787 words ......not measuring noise output but instead using a technical standard known as bypass ratio, which he said had ''no correlation'' with sound levels. Because the bypass ratio which measures air flow through the engine does not have a direct bearing...