New (and freely available from the New York State Museum) is Daniel and Floyd Hungerford: Rocket Power, Interstellar Travel, and Eternal Life.
Yes, it’s a rocket car. Yes, it was licensed to drive on New York roads. Yes, the name of the rocket car is Shirley Lois “The Moon Girl.” Yes, Buck Rogers himself told them they “were doing humanity a real service.”
OK, so pictures of the Hungerford Rocket are all over the internet –like the one from the Hemmings blog above — but Geoffrey Stein has produced what will likely be the definitive history (and probably the only history) of it and its creators.
This was their plan: “Our idea as we went along was to construct a second pilot model if the first one was as successful as we thought it would be, then we considered trying to build a rocket ship which might reach the Moon,but we never got any further on this than having a picture painted by a sign painter we knew.” (p. 21)
Download the pdf at the New York State Museum