It is not that hard to figure out velocity if you have a good handle an acceleration so I think accelerometers could be used. It would not be as accurate as directly measuring velocity, but would probably be good enough if you can figure out how to calibrate it. With strain gauges I don't think knowing the speed of the kayak would be sufficient to deduce work on the paddle. Work on the boat, yes, paddle, no, unless you get the speed of the paddle (see accelerometer). A length adjustable shaft with interchangeable blades, strain gauges and accelerometers would be great. While we are at it, if we could put water speed sensors on various points on the blades, we would really have something. Nick On Friday, June 13, 2003, at 09:50 AM, Michael Daly wrote: > On 12 Jun 2003 at 21:30, Matt Broze wrote: > >> first). I think someone who came up with an electronic paddle shaft >> (that blades could be changed on) could sell such a system to several >> groups of people. > > Lendal's Paddlok system comes to mind, though you'd have to modify > other maker's blades to fit. If you get a variable length version, > then the widgets you plug into other makers' blades to adapt to the > Lendal shaft could be accomodated. You'd have to fabricate your own > adapter widgets, of course - no one sells such a thing that I'm aware > of. > > Paddle rotation may be measured, but gyros aren't the way to go. > Accelerometers only measure acceleration, not velocity, so any > constant velocity period in the stroke would be unknown (except in > duration). You might be able to make it work (integration of values > etc) but I'd have to think about it. There were MIDI based systems > that allowed people to "conduct" music by following thier hands > (without touching anything) - something like that could be adapted. > > On Nick's comments: > > As far as strain guages only measuring forces - you also have time > and boat speed measures. Something in the back of my mind tells me > that this combo can be used to effectively deduce work, but I haven't > worked it out. > > Mike > PS - I'll be away for a few days - how come the interesting stuff on > Paddlewise occurs when I leave??? :-) *************************************************************************** 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 Fri Jun 13 2003 - 09:43:34 PDT
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