The dyno jet utilizes the popular jet pump powering system. there are plenty of "jet skis" that have suffered hull damage but the propulsion system is still in good. What are the differences between drop stitch air and plywood floors? once inflated, a high pressure air floor becomes as rigid as a. Specializes in stitch and glue, epoxy/wood composite designs for sailboats suitable for home builders. also offers a boat building video and book..