On 22 Oct 2004 at 20:40, John Winters wrote: > You and I both. Bruce Winterbon talked to a fellow physicist who > figured out a way of doing it that made sense but neither Bruce nor I > had time to develop the device. Basically it measured the net force > and its direction acting on the boat and recorded it through out the > stroke. The seat "floated on sensors in the boat. Sounded good to me > but maybe some one knows why it would not have worked and will make me > feel good about not trying it. If you make a seat-and-footpeg frame and mount it on three supports (statically determinate), then put appropriate strain gauges on the supports, you could measure the net direction of all forces and moments on the kayak due to the paddler. This would even allow for leg power. With appropriately stiff supports, the paddler would not even feel the difference between this and a normal kayak. However, this would not give much info on the paddle itself. You'd still need to measure its position in time. With the position of the paddle relative to the kayak and the forces on the kayak, you could deduce the forces in the paddle at some point (e.g. centroid of submerged area - assuming calm water). Integrating over displacement would yield work done. Mike *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Wed Sep 22 2004 - 22:20:23 PDT
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