Tim.
I take your points.
I must stop looking at the simple laws of physics and how that impacts on current aero-engineering.
I must stop believing that just because some of us know what we are talking about our views are somehow worth more than someone who flew "Afterburner" twice.
I need to get away from that parochial attitude and see the "wider picture"
One further question though.
What colour is the sky on your planet?