The thing I wonder about is how pleasant it would be to pax on one of these things?
Acceleration and climb to altitude would be around +4g's I'd imagine?
The cruise would be ok.
But then another minimum 4g decceleration at least?
And you'd have to join straight in on a 30-40 mile final....???!!!
Er, why? What would be the point?
Concorde, at full afterburner, has less than 0,4g thrust to weight at MTOW.
If you arrive at Mach 5 and decelerate at 4g, you will stop in 40 seconds, and cover 30 km over the time. Why not decelerate at 0,4 g over 7 minutes, covering 300 km in the meanwhile?