As a designer let’s consider that we want to build an aircraft weighing 28000 units at take-off. How many engine will require if our thrust loading T.L. is 0.71 and thrust per engine is 10000 unit?(a) 2(b) 3(c) 4(d) 1The question was posed to me in unit test.I want to ask this question from Fixed-Engine Sizing in portion Initial Sizing of Aircraft Design

As a designer let’s consider that we want to build an aircraft weigh

1.	As a designer let’s consider that we want to build an aircraft weighing 28000 units at take-off. How many engine will require if our thrust loading T.L. is 0.71 and thrust per engine is 10000 unit?(a) 2(b) 3(c) 4(d) 1The question was posed to me in unit test.I want to ask this question from Fixed-Engine Sizing in portion Initial Sizing of Aircraft Design
Answer» Right choice is (a) 2 For explanation I would say: Given, thrust PER engine T = 10000 unit and thrust loading T.L. = 0.71 Now, take-off gross weight is 28000 units. Now, number engines REQUIRED is given by, N = WT.L. / T = 280000.71/10000 = 1.98. We cannot use 1.98 engines so we will take the NEAREST INTEGER. Hence, the answer will be 2.

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