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Subsonic non afterburning engine has takeoff thrust of 8000 Newton and is operating with BPR of 1.2 then, what will be the approximate value of thrust at cruise.(a) 2001.5 unit(b) 1001.5 unit(c) 500 unit(d) 100 unitI have been asked this question in an online interview.The question is from Propulsion in portion Propulsion and Fuel System Integration of Aircraft Design

Answer»

Correct answer is (a) 2001.5 UNIT

To explain: Given, Thrust T1 = 8000N, BPR = 1.2

Now, thrust at cruise T = 0.60 * T^10.9 * E ^(0.02*BPR) = 0.60 * (8000)^0.9 * e ^(0.02*1.2) = 0.60*3256.724*1.024 = 2001.49 = 2001.5 unit.



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