There are plenty of paper launch systems that engineers have run numbers on showing they could work, that won’t work in practice. This and VentureStar are two e

There are plenty of paper launch systems that engineers have run numbers on showing they could work, that won’t work in practice. This and VentureStar are two examples. In this case it’s not the shape as much as carrying way too much extra/dead mass, jet engines, aero spikes, and using a LH2 means much more massive tankage requirements.