Phil

I hear what you are saying but surely the amount the engine is pushing the airframe will be reducing from 1mph to 400mph and not go from 20lb at 399mph to 0lb at 400mph. So could we say at 200mph the thrust of the 400mph EGS engine could be 10lb dynamic thrust and the 1050mph engine could be 16lb ish dynamic thrust? I know these figures don't take drag in to account but you get the idea.

jason