Configuration of the notional <a href="https://en.wikipedia.org/wiki/en:Project_Orion" class="extiw" title="w:en:Project Orion">Project Orion</a> spacecraft. NASA - Public Domain.
Uploaded by <a href="//commons.wikimedia.org/wiki/User:Georgewilliamherbert" title="User:Georgewilliamherbert">Georgewilliamherbert</a> 10:59, 10 January 2007 (UTC)
<a rel="nofollow" class="external text" href="http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19770085619_1977085619.pdf">Nuclear Pulse Space Vehicle Study  Vol III - Conceptual Vehicle Designs and Operational Systems</a>, Fig 2.1, pp 4.