I made this model to accompany a blog post I'm writing for Icarus Interstellar.
ICAN-II was an idea for an antimatter powered manned spacecraft that was developed at Penn State University (a university I will be attending in the fall) in the 1990's. The original design was intended for manned travel to Mars, but calculations were performed for a round-trip voyage to Jupiter and a no-return mission out to Pluto. The flight time from Earth-orbit to Mars was just 30 days and required only 30 nanograms of antiprotons to initiate the reaction, as well as 362 metric tons of reaction mass, provided by a spherical shell of silicon carbide.
Image background courtesy of NASA.