posted on Jun, 20 2014 @ 09:44 AM
14 day to mars propulsion schemes are not mature and really no where near mature. the current near term limits are between 6 months and nearly a year
one way. there are a couple of possible 29 day technologies but they are not mature. VASIMR, M2P2. VASIMR is the closest rapid transit technology that
is actually about to enter the testing phase. M2P2 has gone silent of late.
after that some sort of fusion rocket or NTR (Nucler Thermal Rocket) would be the nearest thing to the type of trip time you cited. NTR was tested on
the ground and they do work but there are treaty problems with any use in space and severe consequences for the environment if an open cycle NTR is
every used in the atmosphere.
Fusion rockets are a puzzle. we have a few fusion schemes that look like they are about to come to fruition. but some are not easy to translate into a
rocket. some are. but all of these are just "on the brink" of being real. so they may be finished tomorrow or they may be finished in 30 years or
never. at any rate the first generation fusion rockets derived from most of these will probably only slightly exceed the speeds of our fastest probes
like voyager, helios and new horizons. but when fusion matures to the point we have steady fusion going on then fusion will potentially have speeds up
to .35 light speed with an optimized engine.