Design and system integration of a rim jet solution utilizing DFMA

Abstract: Moving a new innovative idea from the drawing board to production is no easy feat. The Swedish sea rescue society (SSRS) has for the past years fostered a new design solution for their jet skis, a alternative water jet that removes the centre hub and utilises rim drive technology. The "Rim Jet" would help solve problems during rescue operations while at the same time be a starting point for SSRS zero-emission vision. To make this idea reality a first prototype is necessary for a proof of concept. Previous work on this project, conducted by three master students, resulted in a design that lacked feasibility. Through the implementation of Design for manufacture and Assembly (DFMA) on the rim jet a new itteration of the design is proposed. A practical and case based analysis of the DFMA method on a novel, non mass produced prototype was preformed discussing its advantages and disadvantages to generate a feasible, lighter, simpler and more cost efficient design. Complementing the redesign of the rim jet is a complete systems analysis of the jet ski including battery evaluation, systems integration and initial testing procedures. The final rim jet design illustrates the benefits of utilising DFMA within small, single product, projects. Implementing core elements of DFMA has proven to generate similar positive effects as intended for serial mass produced products normally associated with method.