Analysis of information sources in references of the Wikipedia article "Project Orion (nuclear propulsion)" in English language version.
Two or possibly three Saturn V's would have been required to put this vehicle into orbit, and some on-orbit assembly would be required. Several mission profiles were considered – the one developed in greatest detail was for a Mars mission. Eight astronauts, with around 100 tons of equipment and supplies, could have made a round trip to Mars in 125 days (most plans call for one-way times of at least nine months). Another impressive figure is that as much as 45% of the gross vehicle in Earth orbit could have been payload.
Two or possibly three Saturn V's would have been required to put this vehicle into orbit, and some on-orbit assembly would be required. Several mission profiles were considered – the one developed in greatest detail was for a Mars mission. Eight astronauts, with around 100 tons of equipment and supplies, could have made a round trip to Mars in 125 days (most plans call for one-way times of at least nine months). Another impressive figure is that as much as 45% of the gross vehicle in Earth orbit could have been payload.