The proposed <a href="https://en.wikipedia.org/wiki/Skylon" class="extiw" title="w:Skylon">Skylon</a> spacecraft
<a href="https://en.wikipedia.org/wiki/User:GW_Simulations" class="extiw" title="w:User:GW Simulations">GW Simulations</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>