The plasma magnet sail engine is little more than 2 pairs of charged rotating coils and is therefore extremely simple and inexpensive. A fully powered plasma magnet sail using a small nuclear power source could accelerate at 0.5G and reach 400-700 km/sec (0.2% of lightspeed) in half a day. (H/T Centauri Dreams) * Carrying a … Continue reading Plasma Magnet Sails to get manned missions to Mars in 1 week