Discussion
Arrange these steps in selecting an engine type for a new aircraft:
1. Establish the design cruise speed and altitude
2. Identify the types whose efficiency peaks in that regime
3. Compare fuel consumption, weight and installed drag
4. Assess noise, cost and certification requirements
5. Select the type and begin detailed matching
Select the correct sequence.
Answer: B
Cruise speed narrows the field before any detailed comparison is worth making, because propulsive efficiency depends on it so strongly. Noise and cost then decide between candidates that the aerodynamic and thermodynamic case has left roughly equal.
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