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>> You might mean that the efficiency of the fuel usage decreases when the
>> exhaust velocity exceeds a certain speed. This is true for self-fuelled
>> designs, but that particular exhaust speed depends on the kind of fuel, the
>> efficiency of the engine and the final velocity of the starship.
>> For fusion designs this optimal exhaust velocity is rather low (but still
>> high compared to todays technology), usually less than 6% of the light
>> Timothy (van der Linden)
>Perhaps Ben meant to say "exhaust velocity" instead of "escape velocity";
>would follow the gist of his context. Right, Ben?
I think I addressed that in the last paragraph.