Welcome to absolutely free plans, in this section you will find free boat building plans including accessories and construction techniques. free plans have a tendency. 21 paddlewheel and novelty boat plans collection. 21 different and unique boat plans. instant download access! paddlewheel and novelty boat. A steamboat is a boat that is propelled primarily by steam power, typically driving propellers or paddlewheels. steamboats sometimes use the prefix designation ss, s.