Mar 192020
United Tech was mostly interested in solid propellant boosters for the Dyna Soar program… specifically, boosters to strap to the side of the Titan II. Initially conical in shape, those early concept boosters would turn into the UA-1205 boosters fitted to the Titan IIIC booster. But UTC also studied liquid propellant boosters for the Dyna Soar, including the Saturn derived design shown below which featured a Saturn S-II stage for the first stage, an S-IV (*not* an S-IVb) for the second stage and an S-V stage (a modified Centaur) for the third. The design of the Dyan Soar is purely notional; United Tech seemingly did no design work on that and simply sketched in a spaceplane roughly along the lines of the design Boeing had.
