Pt boat plans for the famous pt 109 offered in 1:32, 1:24 and 1:16 scale – buy and download a relatively easy-to-build semi scale blueprint of an elco 80-footer.. The national pt boat museum at battleship cove p.t. boats were powered by three 4m-2500 packard marine engines developed by the packard motor car company specifically for the united states motor torpedo boat program.. The pt torpedo boats of wwii were a new idea at the time. the boats were built of plywood, so they could be manufactured quickly,and repaired even faster..