Peter wrote: >>>Thanks for the power information and for making the point about arm weight. Taking that point further it would seem appropriate to treat the arm and paddle combination as three segments: i) paddle ii) forearm and hand iii) upper arm, because each segment's centre of mass will have a different vertical displacement when a paddle blade is raised, at least in my paddle stroke. The cadaver paper has the arm segment values so I'll recalculate the potential energy for lifting each segment at the weekend.<<<<< I think that will be an unneccessarily complicated way to figure your arm weight. If you weigh your hand after supporting your shoulder where it pivots and add the paddle weight actually being lifted you should get how much weight you are effectively lifting. You could weigh your hand at the average arm angle (during your stroke) to get an average weight for it during the stroke. Each hand should probably be done separately. The paddle should probably also be weighed too when you weigh your upper hand by supporting the lower hand on a box with the paddle at the average angle the upper hand is lifting it through. The distance the hand moves up and down during the stroke should then be used in the calculations (rather than the average distance the paddle center moves). Do the power required to lift that hand and paddle calculations by measuring the hands upward movement from the end of the power stroke to the top of the hand lift (separeately for each hand as you may be lifting higher with one hand than with the other--possibly by bending the wrist back with the control hand) and then calculate them separately (or take an average of the lift distance and arm weight and paddle weight at each hand) to get the average power put into one lifting stroke. I'm attaching the Coaster power curves and sending separate e-mails to Peter and Niels in the hopes that they can get it since I see Paddlewise blocks attachments. To convert HP (in the chart I'm sending) to watts multiply by 745.7. [demime 1.01e removed an attachment of type application/vnd] *************************************************************************** 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/ ***************************************************************************
MATT MARINER BROZE wrote: > I think that will be an unneccessarily complicated way to figure your arm weight. > If you weigh your hand after supporting your shoulder where it pivots and add the > paddle weight actually being lifted you should get how much weight you are > effectively lifting. You could weigh your hand at the average arm angle > (during your stroke) to get an average weight for it during the stroke. > Each hand should probably be done separately. The paddle should probably also > be weighed too when you weigh your upper hand by supporting the lower hand > on a box with the paddle at the average angle the upper hand is lifting it through. A few points: - Your arm is ALREADY supported at the shoulder - by the shoulder. There's no need to further support it. - Unless there's a big difference between your arms, there's little reason to weigh them seperately. - There's little reason to weigh your paddle seperately, if you going to add up the weights of arms and paddle anyway. *************************************************************************** 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/ ***************************************************************************
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