On Saturday I posted a review of Stephen Baxter's brilliant hard-science Alternate History novel, "Voyage." In that book, he came up with the very clever idea of attaching Shuttle-styled Solid Rocket Boosters to the old Saturn V moon rockets, so as to get more bang for their buck. Baxter avoids specifics when discussing the superattenuated Saturn Vs, but makes some offhand comments about them being able to carry twice as much cargo as a 'real' Saturn.