Discussion
Which statement about mission fuel fractions is TRUE?
Answer: A
Correct answer: Segment ratios are multiplied, not added
Each fraction is the ratio of weight at the end of a segment to weight at the start, so the overall ratio is their product - the output of one segment is the input to the next. Adding them would give a number greater than one, which is meaningless. The cruise segment usually dominates the product, but every segment contributes, and reserves are added afterwards.
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