Tjt 3000 Eagle
Thankfully there's nothing more to say really.
12-17-2002, 08:01 AM
#52
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Join Date: Jan 2002
Location: Southport, UNITED KINGDOM
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Informed choices.
Hi, I'd just like to add some food for thought on the subject. When it comes to engine performance and consumer choice I think it would certainly help if there were an informed choice to be made i.e. each engine has an independently verified set of performance figures available, giving basic easy to understand gen such as temp adjusted thrust, fuel consumption against thrust, service intervals, etc.
All this stuff is quite easy to obtain, the format of the GTBA efficiency competion, held annually here in the U.K. being a good example. Where any engines can be run and an independant set of figures obtained and instant comparisons made. Although there were were not many other manufacturers engines run, the recently held 2002 comp showed a reasonable enough set of figures for one of my TJT engines from an A4 Skyhawk, (had 18 hours flying time on the clock), to gain the thrust specific fuel consumption performance trophy, see pic.
Lastly, thrust or to be more specific 'static thrust' is a very basic parameter and if it were possible I think dynamic thrust values would also help with choices. As an example 2 different manufacturers engines might give very similar static thrust and mass flow but the exhaust gas velocity could be higher on one than the other....given the same airframe and flying conditions, which do you think would give the higher max airspeed ?
It is also interesting to note the reaction when a pilot flies a different manufacturers engine of the same thrust class for the first time, the actual flight performance and his reaction being more of a true test of 'real-world' engine performance.
Hope that stimulates a bit more thought on the subject.
Regards, Rob.
All this stuff is quite easy to obtain, the format of the GTBA efficiency competion, held annually here in the U.K. being a good example. Where any engines can be run and an independant set of figures obtained and instant comparisons made. Although there were were not many other manufacturers engines run, the recently held 2002 comp showed a reasonable enough set of figures for one of my TJT engines from an A4 Skyhawk, (had 18 hours flying time on the clock), to gain the thrust specific fuel consumption performance trophy, see pic.
Lastly, thrust or to be more specific 'static thrust' is a very basic parameter and if it were possible I think dynamic thrust values would also help with choices. As an example 2 different manufacturers engines might give very similar static thrust and mass flow but the exhaust gas velocity could be higher on one than the other....given the same airframe and flying conditions, which do you think would give the higher max airspeed ?
It is also interesting to note the reaction when a pilot flies a different manufacturers engine of the same thrust class for the first time, the actual flight performance and his reaction being more of a true test of 'real-world' engine performance.
Hope that stimulates a bit more thought on the subject.
Regards, Rob.
