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1.25m Scramjet


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First off, what is a scramjet?

This: http://m.imgur.com/u6w1LhQ

It functions as a low-efficiency jet engine at sea level, and, when travelling at speed, provides an extra, sudden kick within its velocity range. Too fast or too slow and it will be inefficient.

This would be good forpayloads with a variable fuel usage, but for SSTOs with strict fuel restrictions, not so well. 

We have jet engines and this closely resembles a Rapier engine, but a Scramjet is something we do not yet have.

Oh, and they produce a LOT of heat.

what are your thoughts?

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