Hi All, Not sure if this is the right section but happy if its moved by mods. Back in the 50's Dyson and his team came up with the Orion pusher-plate spacecraft and the figures looked like it would work. Apparently it was shelved due to the nuclear testing treaty. Now in the style typical of the day they thought big so the craft would be like a flying house. What I want to know is given the advances today how small could we build a pusher-plate spacecraft? Many thanks for any replies.