snips

snips

The Citation II engine is not a turbo prop engine nor is it used
to power helicopters. Turbo fan engines are not rated in BSFC.
They are rated in pounds of thrust per pound of fuel burned.
Further more you are talking 40,000 feet while a helicopter
finds it hard to get over 18,000 feet. The pounds of fuel
burned in a Willams WJ24 is 1.2 pounds of fuel burned per
pound of thrust.

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"The pounds of fuel burned in a Willams WJ24 is 1.2 pounds of
fuel burned per pound of thrust."

I find it interesting that the first jet engine only consumed .1 pound
per pound of thrust per hour more than the Williams:)

http://www.ueet.nasa.gov/engines101.php

1930 - Sir Frank Whittle in England patented a design for a gas turbine
for jet propoulsion. The first successful use of this engine was in
April, 1937. His early work on the theory of gas propulsion was
based on the contributions of most of the earlier pioneers of this field.

The specifications of the first jet engine were:

    * Airflow = 25 pounds/sec
    * Fuel Consumption = 200/gal/h or 1300 lb/h
    * Thrust = 1000 lb
    * Specific Fule consumption = 1300/1000 = 1.3 lb/lb/h

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Here is a table I gleaned from.
http://www.aircraftenginedesign.com/TableB3.html

Paul Lamar

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