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Originally Posted by JamesH
Rocket is used for initial speed up, then the jet use to give the throttle up/down required. Cannot use jet at full power from stationary as it sucks in too much debris (need to be going > 100mph before giving it the big right foot). Hybrid rocket engines are not really throttleable, just on/off.
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James, having visited the link you posted, it seems the JET engine will be used from launch to 300 mph. Then the ROCKET will be ignited, so both the JET and the ROCKET are providing thrust. When the intended speed of 1050 mph is reached, the ROCKET will be stopped (presumably they will stop pumping the peroxide?) but the jet 'will continue burning for a few seconds'
I noticed the press/media have been raving about the G forces involved. Certainly the acceleration Gs are impressive (2G+) with deceleration at nearly 3Gs - but deceleration in F1 is far higher, - isn't it?