Category: sit-ski

Sit Ski

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---- PROTOTYPE --------- PURPOSE: To create a prototype of a sit ski for a new member of the U.S. Adaptive Ski Team to be used in international competition at the Paralympics. This sit ski consists of light, form-fitted frames and a seat mounted to a pair of standard cross country skis. It allow athletes with lower extremity and mobility disabilities or spinal cord injury to sit while skiing to use poles to propel themselves with their upper body when necessary. Each individual has unique requirements for his or her sit ski in order to optimize performance. Top priorities for de included reduced weight, increased rider comfort, and durability. The final design for this sit ski utilized a combination of an injection molded plastic seat and a frame made from aluminum tubing. These materials were chosen due to their light weight, strength, and availability. The design can be broken down into four components: the frame, seat, bindings, and restraints. The frame used three different tubing sizes to construct a sit ski that is as light and as strong as possible. The bucket seat is constructed from injection molded plastic. The seat is supplied by Enabling Technologies, LLC. The binding system uses two NNN bindings on each ski. They face in opposite directions to keep the skis rigidly attached to the frame. The final element of the design is the restraints that hold the rider in the sit ski. The restraints consist of 2-inch wide nylon straps for the seat and a 1-inch wide nylon strap to secure the feet to the footplate. An additional nylon strap is riveted to the footplate and attached to the back seat support so that the user can pull his legs tight should spasticity occur. This will effectively stretch his calves and allow the spasticity to subside. The analysis performed on the sit ski design focused on the strength of the frame. The initial hand calculations performed on the frame gave rough engineering estimates for appropriate sizing. The structure was highly indeterminate and challenging to analyze with traditional methods. Although hand calculations were used to gain an understanding of how the structure would respond to loads, a more detailed finite element analysis was used to get a more accurate prediction of frame strength and deflection. The final product performed well in initial testing and has been delivered to the client for further testing. The cost to produce the prototype is $1,167.00 in materials. TITLE: Sit Ski for the US Adaptive Ski Team. JOURNAL: NSF 2010 Engineering Senior Design Projects to Aid Persons with Disabilities. REF: Chapter 6: pp. 46-47. PAGES: 3 with cover. 2010. WEB:


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Sit Ski