I’m an aviation nut but for the love of me I can’t find an explanation that makes sense to me
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A turbojet uses a turbine to run a compressor that compresses the incoming air before combustion, these can be used for takeoff because they suck in the air they require.
A ramjet relies on the inertia of the air to compress it before combustion, and needs a high velocity stream of air to get started. In a normal ramjet the air slows down to subsonic velocities(relative to the plane) as it is compressed. In a scramjet the air stays supersonic as it travels through the engine, but as the flame cannot propagate upstream, it’s more difficult to keep the engine lit.
Turbojets are the slowest of the group, and scramjets are the fastest. Some engines, like those used in the SR-71, blur the line between turbojet and ramjet.
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