Discussion
Consider the following pairs of engine type and suitable regime:
High bypass turbofan - Long range subsonic cruise
Turboprop - Low to moderate speed regional operation
Scramjet - Hypersonic flight
Ramjet - Take-off from rest
How many of the pairs given above are correctly matched?
Answer: C
Correct answer: Only three
The first three pairings are sound. The fourth is not: a ramjet has no compressor and depends entirely on ram compression, so it develops no useful thrust at rest and must be accelerated to roughly Mach 2 by some other means. That single limitation is why ramjets appear on missiles boosted by a rocket, and never as a vehicle’s only engine.
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