Allen Meece wrote:

I think the PDE will scale up to make a flyback launch assister for a CATS
SSTO.
The site says the PDE is great between 2 to 4 machs and can take off from
zero speed so it offers a lot in the way of airbreathing launchers.

Who cares? Supersonic mated flight and seperation is too complex and
risky. Seperate subsonically (with existing 'first stage' aircraft, if
possible) at the highest altitude practical, to minimize drag and engine
expansion issues for your orbiter.

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