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Keep in mind that increased thrust and improved fuel efficiency are both needed for real improvements.
Making an engine twice as powerful alone does not off as much improvement as some might think as aircraft have fixed capacity internal fuel tanks that are designed for the engines available at the time of design.
Fuel consumption is generally measured in weight of fuel burned to generate the energy developed per hour of operation... if you double you energy produced you double the fuel consumption if you don't improve fuel consumption.
A case in point was the Yak-38 and Yak-38M VSTOL aircraft... the latter had a more powerful main engine, but because the aircraft itself was a subsonic design and no amount of extra thrust would allow it to be supersonic then the extra power increased take off weight but just shortened effective flight range.
Extra power with these engines however... with the bonus of internal weapons carriage meaning low drag should allow a boost in super cruising speed extending range and lowering IR signature and expanding flight range and improving the ability to evade or to chase targets down.
Making an engine twice as powerful alone does not off as much improvement as some might think as aircraft have fixed capacity internal fuel tanks that are designed for the engines available at the time of design.
Fuel consumption is generally measured in weight of fuel burned to generate the energy developed per hour of operation... if you double you energy produced you double the fuel consumption if you don't improve fuel consumption.
A case in point was the Yak-38 and Yak-38M VSTOL aircraft... the latter had a more powerful main engine, but because the aircraft itself was a subsonic design and no amount of extra thrust would allow it to be supersonic then the extra power increased take off weight but just shortened effective flight range.
Extra power with these engines however... with the bonus of internal weapons carriage meaning low drag should allow a boost in super cruising speed extending range and lowering IR signature and expanding flight range and improving the ability to evade or to chase targets down.
I already posted this, post nr 891 
