Tucchase:
The United States is a very special ship, but was launched in 1951, you may be thinking of her smaller, older sister, the S.S. America that was launched in 1939 as served as a fast transport under the name of "West Point." The America had a 37,400SHP steam turbine plant that could produce over 24 knots (Arnold Kludas, Great Passenger Ships of the World, Vol. 4), but doubt that she spent much time unescorted during the war. Cunard's Queen Mary and Queen Elizabeth did travel unescorted for much of the distance between the US and UK, but they were capable of speeds in excess of 30 knots.
Subfixer:
I hadn't heard that the hull of the United States served as the prototype for the hull of the U.S.S. Enterprise. The "Big U" has a 240,000 SHP plant that was largely based on the plant for the Midway class carriers (1946). Since the Midways were followed by the four carriers of the Forrestal class (laid down from 1952 to 1955) and the Kitty Hawk and Constellation (1955 and 1956) it seems likely that the hull of the Enterprise (laid down in 1958) owed more to those ships than it did to the United States.
As to the design of the United States, if you compare pictures of the United States and the former German liners Europa and Bremen (1929/30) you can see that William Francis Gibbs' design for the United States owed more to the German liners than to the earlier America. The German liners were 938', 50,000 GRT, 27 knot ships compared to 53,339 GRT, 990', and over 35 knots for the United States).
All:
I have a re-issue of the "flat bottomed" Revell kit of the United States and will probably get around to building it one of these days if a better kit doesn't come along before then. Patrick Camilleri has a great build of the Revell kit on the model ship gallery: www.modelshipgallery.com/.../us-index.html.
With all of the Titanic kits that have been on the market in the last 20 years, it's hard to believe that there is much demand for another one. Oh, well.
Best,
Mike