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An aircraft needs to accelerate from 0.8M to 2.0M. What should be the mission segment weight fraction if fixed engine sizing is used?

An aircraft needs to accelerate from 0.8M to 2.0M. What should be the mission segment weight fraction if fixed engine sizing is used? Correct Answer 0.956

For an aircraft that accelerates from 0.1M to 0.8M, the required fuel fraction is 0.9805. Similarly, for 0.1M to 2.0M we required a fuel fraction of 0.937 typically. Now to find fuel fraction for aircraft from 0.8M to 2.0M is given by, Fuel fraction = (required fuel fraction for 0.1M to 2.0M)/(required fuel fraction for 0.1M to 0.8M) = 0.937 / 0.9805 = 0.956.

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