Re: How Can We Have NTR SSTO?

SSTO is about 9.2km/sec when you consider gravity and aero losses.For an exhaust velocity of 3300 (Raptor-SL), that gets you a mass ratio (MR) of 16.2.  Just for an expendable dry mass of 100t (including payload) that's a fuel tank of 1500t, and that ...