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A Jet transport aircraft is flying with crew load of 175kg, payload of 1400kg and fuel weight of 500kg. Find out Fuel to empty weight fraction, if design take-off gross weight of the aircraft is 5600lb.(a) 1.076(b) 0.1831(c) 0.196(d) 0.1418I got this question during an interview.Question is from Conceptual Sketch Sizing topic in portion Conceptual Sketch Sizing of Aircraft Design

Answer»

The correct answer is (a) 1.076

The explanation: Given,

Design take-off GROSS WEIGHT, W0 = 5600LB = 2539.6825kg

Crew load = 175kg

Payload weight = 1400kg, fuel weight = 500kg

Now the design take – off gross weight is given by,

W0 = Wcrew + Wpayload + WFUEL + Wempty

2539.682 = 175+ 1400 + 500 + Wempty

So, Wempty = 464.682kg

Fuel weight fraction = Wfuel / W0

Empty weight fraction = Wempty / W0

Now fuel to empty weight fraction = Wfuel / Wempty = 500/464.682 = 1.076.



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