Here is the Root & Vandervort "stable" of engines, by Rocky Rockwell. In the foreground of course is the newest of the line (not even available yet). In the center is their vertical R&V which came out about 2 years ago, and finally their "original" model the R&V horizontal engine. Rocky markets plans and castings for the two and within a few months will be doing the same with the newest model. http://www.home.earthlink.net/~randyarockwell/ >