Blake Mantel wrote:

Commercial Engines:
PW8000 Engine

Characteristics

Fan tip diameter: 76 inches

Length, flange to flange: 124 inches

Takeoff thrust: 25,000 - 35,000
pounds of thrust

Bypass ratio: 11-to-1




A Game-Changing Geared Turbofan for the Next Century

 Pratt & Whitney is developing an engine that will set new
standards for reliability, operating cost, fuel burn, and noise
levels for the 21st century. The PW8000 geared turbofan is
the next leap in engine technology.

As an extension of the smaller PW6000 family, the "green"
PW8000 engine, launched in 1998, will reduce fuel burn 9
percent and cut noise levels 30 decibels over current
engines. Because of the efficiency of the geared turbofan
design, the number of stages in the engine can be reduced
40 percent and the number of airfoils cut in half.

An aircraft flying with two PW8000s will cost airlines about
$600,000 a year less to operate and maintain than one
powered by a conventional engine.

The geared turbofan is the result of more than 10 years of
research by Pratt & Whitney and an investment in technology
development of $350 million since the mid-1980s. The
engine's fan, which produces most of the thrust, is driven
through a reduction gearbox, rather than being directly
connected to the rest of the engine.

Initially, the PW8000 geared turbofan will cover a range of
between 25,000 and 35,000 pounds of thrust for aircraft
seating 120-180 passengers. However, our geared fan
technology can be sized to any sized aircraft. Flight testing is
expected to begin by 2003.

I got a picture of the planetary gear box they will use in this engine.
I'll upload it with a later message.

Paul Lamar
 
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