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#1
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Hey there, sorry for the cross-post!
I might be taking on a project where we try to determine the power (force and velocity) developed by a kayaker while paddling. I'm wondering if anyone out there knows of any research that's been done like this. I know that it is a fairly common thing for rowing crews to be "instrumented" with strain guages on the oars, and potentiometers on the oarlocks, to get force/time curves for on-water rowing. So, I'm wondering if anyone is aware of this sort of study having been done on kayaking or canoeing. The obvious problem with kayaking and canoeing, is that the paddle has no fixed pivot point, like a rowing shell does. So most likely some sort of video kinematic analysis will be necessary. We have the capability to set this up, although I think the physics will be complicated (i.e. statically indeterminant problem). I've done a search of the scientific journal literature (Medline) and haven't found any published papers on this topic, but that doesn't mean the work hasn't been done at some National training center, or product development center somewhere... or that it's in a very obscure journal that Medline doesn't cover. I'd appreciate any thoughts or hints on who might have done this sort of work in the past. I'd rather not re-invent the wheel, if I can maybe work on just improving it! :-) Thanks, Kieran Coghlan |
#2
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Kieran wrote:
I might be taking on a project where we try to determine the power (force and velocity) developed by a kayaker while paddling. I'm wondering if anyone out there knows of any research that's been done like this. I know that it is a fairly common thing for rowing crews to be "instrumented" with strain guages on the oars, and potentiometers on the oarlocks, to get force/time curves for on-water rowing. So, I'm wondering if anyone is aware of this sort of study having been done on kayaking or canoeing. For swimming, one method I know of consists of a line with floats attached to it in a pool. The swimmer then pushes his hands against the floats with each stroke and the power for each stroke is then measured in the floats IIRC. There ought to be a better description of this on the web. Another method might be to just drag a kayak with a line accross the water at paddling speed and measure the force needed to do this, but I suspect you want some more detailed measurements. Maybe you can combine this with a videocamera. greetings, Michiel |
#3
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![]() Kieran wrote: Hey there, sorry for the cross-post! I might be taking on a project where we try to determine the power (force and velocity) developed by a kayaker while paddling. I'm wondering if anyone out there knows of any research that's been done like this. I know that it is a fairly common thing for rowing crews to be "instrumented" with strain guages on the oars, and potentiometers on the oarlocks, to get force/time curves for on-water rowing. So, I'm wondering if anyone is aware of this sort of study having been done on kayaking or canoeing. The obvious problem with kayaking and canoeing, is that the paddle has no fixed pivot point, like a rowing shell does. So most likely some sort of video kinematic analysis will be necessary. We have the capability to set this up, although I think the physics will be complicated (i.e. statically indeterminant problem). I've done a search of the scientific journal literature (Medline) and haven't found any published papers on this topic, but that doesn't mean the work hasn't been done at some National training center, or product development center somewhere... or that it's in a very obscure journal that Medline doesn't cover. google back on RSR just a couple months, someone posted a link to a E. Euro site that did some technique vids for kayaking - maybe there are links from there, I didn't save the link. |
#4
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M.C.D. Roos wrote:
For swimming, one method I know of consists of a line with floats attached to it in a pool. The swimmer then pushes his hands against the floats with each stroke and the power for each stroke is then measured in the floats IIRC. There ought to be a better description of this on the web. Another method might be to just drag a kayak with a line accross the water at paddling speed and measure the force needed to do this, but I suspect you want some more detailed measurements. Maybe you can combine this with a videocamera. greetings, Michiel Thanks for the reply... Yes, we've used the towing technique for determining work done by swimmers, and have applied it to kayaks, we're also familiar with the pushing bouys (and submerged paddles) for swimmers... but I want a more direct measurement of the forces at the blade and the hands. Hoping to possibly also apply this to an inverse dynamics solution of joint reaction forces at the shoulder. -Kieran |
#5
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Kieran wrote:
I might be taking on a project where we try to determine the power (force and velocity) developed by a kayaker while paddling. I'm wondering if anyone out there knows of any research that's been done like this. I know that it is a fairly common thing for rowing crews to be "instrumented" with strain guages on the oars, and potentiometers on the oarlocks, to get force/time curves for on-water rowing. So, I'm wondering if anyone is aware of this sort of study having been done on kayaking or canoeing. If you just want average power generated then you could use some of the test and model data from Sea Kayaker magazine in their kayak test reports that shows the drag force of each boat model at various speeds. Combine this with measured speeds of paddlers in races and it should give an idea of the effective paddling power. |
#6
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On Sat, 26 Feb 2005 17:55:31 GMT, Kieran wrote:
Hey there, sorry for the cross-post! I might be taking on a project where we try to determine the power (force and velocity) developed by a kayaker while paddling. I'm wondering if anyone out there knows of any research that's been done like this. I know that it is a fairly common thing for rowing crews to be "instrumented" with strain guages on the oars, and potentiometers on the oarlocks, to get force/time curves for on-water rowing. So, I'm wondering if anyone is aware of this sort of study having been done on kayaking or canoeing. Kayaking is an Olympic sport, and every such sport has a wide range of technical work done. You might get in touch with a college with a kayaking program, or the US Olympic or Junior Olympic teams. Seems like an opportunity for some synergy. Happy trails, Gary (net.yogi.bear) -- At the 51st percentile of ursine intelligence Gary D. Schwartz, Needham, MA, USA Please reply to: garyDOTschwartzATpoboxDOTcom |
#7
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![]() "Gary S." Idontwantspam@net wrote in message ... On Sat, 26 Feb 2005 17:55:31 GMT, Kieran wrote: Hey there, sorry for the cross-post! I might be taking on a project where we try to determine the power (force and velocity) developed by a kayaker while paddling. I'm wondering if anyone out there knows of any research that's been done like this. I know that it is a fairly common thing for rowing crews to be "instrumented" with strain guages on the oars, and potentiometers on the oarlocks, to get force/time curves for on-water rowing. So, I'm wondering if anyone is aware of this sort of study having been done on kayaking or canoeing. Kayaking is an Olympic sport, and every such sport has a wide range of technical work done. You might get in touch with a college with a kayaking program, or the US Olympic or Junior Olympic teams. Seems like an opportunity for some synergy. Wasn't there an extensive conversation here a few years back (maybe 3 or 4) from someone who was doing his PhD thesis on this? IIRC, he had lots of data and graphs showing where in the stroke the power was applied, and was looking at bentshaft vs straight shaft paddles, depth of the blade, angle of the shaft, etc. He was doing work in a pool, with sensors, flow meters, and the like. The conversation might have branched out into different hull materials, different types of boats, etc. --riverman |
#8
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#9
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The most recent and comprehensive work of this kind that I am aware of
is a phd thesis from the Technical University of Denmark: Determination of Transient Loads on Anisotrophic Paddleshafts, issn 0903-1685, 1994. It is in Danish, with a summary in English. Kieran wrote: Hey there, sorry for the cross-post! I might be taking on a project where we try to determine the power (force and velocity) developed by a kayaker while paddling. I'm wondering if anyone out there knows of any research that's been done like this. I know that it is a fairly common thing for rowing crews to be "instrumented" with strain guages on the oars, and potentiometers on the oarlocks, to get force/time curves for on-water rowing. So, I'm wondering if anyone is aware of this sort of study having been done on kayaking or canoeing. The obvious problem with kayaking and canoeing, is that the paddle has no fixed pivot point, like a rowing shell does. So most likely some sort of video kinematic analysis will be necessary. We have the capability to set this up, although I think the physics will be complicated (i.e. statically indeterminant problem). I've done a search of the scientific journal literature (Medline) and haven't found any published papers on this topic, but that doesn't mean the work hasn't been done at some National training center, or product development center somewhere... or that it's in a very obscure journal that Medline doesn't cover. I'd appreciate any thoughts or hints on who might have done this sort of work in the past. I'd rather not re-invent the wheel, if I can maybe work on just improving it! :-) Thanks, Kieran Coghlan |
#10
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Why not put a strain gauge on the paddle shaft just below the paddler's
hand. This would give you the moment at that point, so the force would be the moment divided by the distance between the strain gauge and the centroid of the paddle blade. |
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