The last Disappearing Propeller Boat was produced in 1956. The most often cited reason for their demise was the invention and perfection of the outboard motor. For various inherent design reasons, the Dis-Pro couldn't make use of a larger engine and propeller, and was unable to putt into the second half of the century. In their efforts to sell boats, the company often stretched the truth a bit, but one advertising claim remains undisputed by anyone who has ever had a ride in one. They are, truly, the greatest little motor boat afloat.