View Full Version : Thrust Maps for jet engines
pilot007
9th Dec 2004, 17:33
Hi!
Have you ever heard of Thrust Maps for jets engines?
It is said to be a chart where you can read out the real thrust of the jet versus altitude and some other parameters... Is that something you guys deal with?
northwing
9th Dec 2004, 20:22
They certainly exist, usually in the form of non-dimensionalised carpet plots of thrust/delta against N/Root Theta and Mach number or some such. To derive the thrust of the installed engine it is necessary to match this data to the air intake and that process is usually an iterative one that takes a big computer. In the jargon it's called a thrust deck because the data came on a deck of punched cards when computers first started to be used for this purpose.
Pilots wouldn't normally get into this sort of thing because it all happens in the design office. By the time the aircraft gets into service the pilot gets charts of performance versus engine setting and works with those. He doesn't know how many pounds of thrust he is getting, just what to set to get off the ground in a given distance.
The "Thrust Map" information is contained in the Performance Engineers Manual for the specific aircraft. This information isnt given to pilots as its useless for their normal operation of an aircraft.
Mutt.