Project Orion aka Old Boom-boom is based on the 'firecracker under a tin can' principle. Except the tin can is a spacecraft, and the firecracker is a nuclear warhead. It has a remarkable specific impulse, but will drastically decrease the property values downwind of the launch site. This unit was developed by the General Atomic in 1960's, and has a 10 meter pusher plate.
Raw stats are from the beginning of time until now. Each follower and download entry represents one hour of data. Uneventful hours are omitted.