Page "Interplanetary spaceflight" Paragraph 44

One proposal using a fusion rocket was Project Daedalus.

Another fairly detailed vehicle system, designed and optimized for crewed Solar System exploration, " Discovery II ", based on the D < sup > 3 </ sup > He reaction but using hydrogen as reaction mass, has been described by a team from NASA's Glenn Research Center.

It achieves characteristic velocities of > 300 km / s with an acceleration of ~ 1. 7 • 10 < sup >− 3 </ sup > g, with a ship initial mass of ~ 1700 metric tons, and payload fraction above 10 %.