The proposed US <a href="https://en.wikipedia.org/wiki/Saturn_II" class="extiw" title="w:Saturn II">Saturn II</a> rocket. Three different proposals, left to right, INT-17, INT-18 and INT-19.
<a href="https://en.wikipedia.org/wiki/User:GW_Simulations" class="extiw" title="w:User:GW Simulations">me</a>
Attribution
<span class="int-own-work" lang="en">Own work</span>