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International Military News and Discussion

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International Military News and Discussion
#70
[quote name='Austin' date='07 March 2010 - 11:06 PM' timestamp='1267982891' post='104939']

Hi Arun two data are known and certain that is weight reduction of ~ 150 kg and Thrust of ~ 15T , but the SFC values are not reveled so its assumed to be atleast same as 117C.

[/quote]







Better T-2-W ratio is a hallmark of a better thrust (efficiency) engine. But when deciding aircraft performance, the significant factor is the thrust 2 weight of the aircraft, not just the engine alone, because SFC values differ at different times:



Quote:It should be noted that SFC varies with throttle setting, altitude and climate. For jet engines, flight speed also has a significant effect upon SFC; SFC is roughly proportional to air speed (actually exhaust velocity), but speed along the ground is also proportional to air speed. Consequently, although the nominal SFC is a useful measure of fuel efficiency, it should be divided by speed to get a way to compare engines that fly at different speeds.





Quote:While specific fuel consumption has its advantages, it has its disadvantages as well. While it allows engines of all sizes to be compared, resulting in a chart that shows the most efficient engine, it can also leave out other important factors. The engine design, what it will be used for, and where it will be used all affect the engine's performance and specific fuel consumption can only make an educated guess at which engine will perform the best.
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International Military News and Discussion - by Guest - 01-29-2010, 12:48 PM
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