Too hard
All the work they did basically concluded the idea sucked. SSTO is too marginal to be useful with current thermal protection systems.
Buzz Aldrin's "Star Boosters" are a better option IMO.
Space/Science » in reply to Why doesn't LockMart continue to develop the X-33?
All the work they did basically concluded the idea sucked. SSTO is too marginal to be useful with current thermal protection systems.
Buzz Aldrin's "Star Boosters" are a better option IMO.