case for Orion (页面存档备份,存于互联网档案馆) Freeman Dyson talking about ProjectOrion Electromagnetic Pulse Shockwaves as a result of Nuclear Pulse Propulsion (页面存档备份,存于互联网档案馆)
unsuitable for launching to orbit. However some designs such as the Orionproject and some nuclear thermal designs do have a thrust to weight ratio in excess of 1