I found this very interesting video on the Found and Explained channel on YouTube. It’s about Orion, a massive space battleship designed, but fortunately never built, by the US navy. The vehicle would have been propelled by nuclear bombs thrown out from the rear of the spacecraft. The force of the explosion would have been caught by a buffer plate on four retracting struts. This would have absorbed the shock, while allowing the spacecraft to move at immense speeds. The ship would have had a complement of 120 men, who would have rested and worked, at least at times, in a centrifuge that would have generated artificial gravity. It would also have carried four shuttle craft, and an arsenal of 140 nuclear bombs. It would also have carried another type of nuclear bomb, the details of which are still classified. This would have been thrown out of the spacecraft and when it exploded would have released a deadly beam of charged particles at its target. It would also have been equipped with a number of conventional naval cannons. I think the intention was to dominate the Earth militarily from space. The navy also planned a number of peaceful missions, including expeditions to Saturn by the 1970s. They didn’t work out any detailed plans but created a detailed model which they showed to Kennedy to persuade him to back the project. It had the opposite effect. Kennedy realised that it would have made the Cold War much worse, and wisely cancelled it.
The video’s sponsored by a Star Trek computer game, and so there’s much comparison between the USS Enterprise and other ships in that series with the Orion battleship. It also goes into the methods by which the spacecraft could be used to become a real starship enabling humanity to reach Alpha Centauri. With its conventional nuclear fuel, it could attain 3.3 per cent of the speed of light, which would enable humanity to reach Alpha Centauri in 144 years. But other techniques could be used, including matter-antimatter annihilation. This could propel the ship to 80 per cent of the speed of light, cutting the journey time to a decade or so. Unfortunately, anti-matter is immensely expensive and so unless or until a cheap method of mass producing it is found, that means of propulsion is impossible.
Sagan mentions the Orion spacecraft in Cosmos, and how it could have taken humanity to the stars. He doesn’t mention, however, the fact that it was intended as a warship. Either he didn’t know, which is unlikely, or that aspect of the ship’s design was classified at the time, and he wasn’t at liberty to divulge it. However, the use of bombs to push a spacecraft forward is actually a sound one. It was tested experimentally on a scale model, and there are clips of this about. The idea goes back to before the Russian Revolution, when an imprisoned revolutionary sketched a platform taking off from the ground propelled by exploding gunpowder bombs beneath it.
Nuclear explosions in space are currently banned under international law, which has helped to prevent atomic war but means that so far only chemical rockets can be used for space exploration. The Beeb a while ago made a science fiction programme about humans exploring the solar system in a nuclear rocket and confidently predicted that, although now fiction, this would actually happen sometime in this century. I’m also struck about how closely the spacecraft resembles the Discovery, the spacecraft that travels to meet the alien monolith around Jupiter in Kubrick’s 2001. That was also nuclear propelled, and its crew also lived in a giant centrifuge to simulate gravity.
I also wonder if JFK cancelled the project for financial as well as geopolitical reasons. Such as spacecraft would have been massively expensive. As it was, the Moon programme absorbed 5 per cent of America’s GDP, and that was for conventional, chemical rockets carrying no more than three men. I can see the construction of a spacecraft like Orion practically bankrupting the entire country, just as trying to keep up with Reagan’s wretched Star Wars programme did the Soviet Union. Scientists have estimated that the technology isn’t necessarily the problem with building spacecraft to other stars. We can almost do it now. It’s just the expense. It’ll be about 200 years before the world can afford to build such spacecraft.
One day a ship like Orion may be built to take us to Alpha Centauri and beyond. But hopefully, not as a warship.