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Find instantaneous range of a jet propelled aircraft if lift to drag ratio is 12 and weight fraction at cruise W1/W0 is 1.9. Consider cruise speed of 120m/s and SFC of 0.00161 per second.(a) 574km(b) 574m(c) 574miles(d) 574ftI have been asked this question in unit test.Question is from Flight Mechanics topic in portion Performance and Flight Mechanics of Aircraft Design

Answer»

The correct OPTION is (a) 574KM

To explain I would SAY: Range = (LIFT to DRAG)*(speed/SFC)*ln (W1/W0)

= 12*(120/0.00161)*ln (1.9) = 574Km.



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