Quote:
Originally posted by Superman
. . .
The SR71 engine did utilize a strategy of compressing the air coming into the engine by virtue of a cone that extends out the center of the engine. This did creat a 'ramjet' effect, probably not quite the same as this SCRAM technology, but effective enough in the low-to-mid mach numbers.
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The cones (note: staight cone sweep) on the SR71 are adjustable to keep the shockwave OUT of the engine intake. (the air on the backside, of a sonic wave, will be subsonic . . .the cone keeps the engine feed with sub-sonic air)
The cone (note it has parabolic sweep) on the drone is such, that the shockwave is focused into the engine intake. (thus the sonic-compresion ram . ..scramjet effect)