Hm, maybe add in fuel rods in place of the fuel to generate the heat? I mean, sure, an open and unshielded just sub-critical reactor is going to have &#x27;environmental effects&#x27;. But if the point, from the black budget perspective, is to have an under the radar bomber, the environment is going to shit anyways. Project Pluto is a good, and completely insane, starting point into nuclear scramjets.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Project_Pluto" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Project_Pluto</a><p>Choice Quote edit:&quot;After delivering all its warheads, the missile could then spend weeks flying over populated areas at low altitudes, causing tremendous ground damage with its shock wave. When it finally lost enough power to fly, and crash-landed, the engine would have a good chance of spewing deadly radiation for months to come&quot;