At 08:08 PM 21/07/98 -0400, Dana wrote: >What we are contemplating is how much energy it takes with each stroke with >different style paddling blades. >Some of us are not so easy to satisfy as you. > >Dana If the afore mentioned coach is correct, and paddling is like pulling your kayak through the water from stake to stake, then you are going to use 'X' amount of energy to move yourself and the kayak, say one kilometre. The paddle itself must be irrelevant. If you move a certain weight through a certain distance, laws of physics will tell you exactly how much energy is needed. It's irrelevant whether you are using a diesel engine, steam power, or man power. Laurie Ford. laurie.ford_at_tassie.net.au http://www.tassie.net.au/~lford *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************
Not quite correct. Force times distance will give you the work performed. Force times distance divided by time will give you the power required. However, the energy input to perform the work depends on the efficiency of the process. At 100% efficiency they are equal. At 50% efficiency twice the energy is required to do the same work. My experience and arms tell me the paddle does make a difference. Changing the direction of a paddle from a straight line requires acceleration. Starting with the basic equation - Force = Mass X Acceleration, For a given paddle stroke (equal speeds and stroke shape) hence the same accelerations, a paddle that weighs half as much will require half the force to move through that same arc at the same speeds. If you watch paddlers you may notice the people using the heavier paddles tend to compensate by using a more circular stroke than some who use an ultralight paddle. At 04:43 PM 7/22/98 +1000, Laurie Ford wrote: >If the afore mentioned coach is correct, and paddling is like pulling your >kayak through the water from stake to stake, then you are going to use 'X' >amount of energy to move yourself and the kayak, say one kilometre. The >paddle itself must be irrelevant. > >If you move a certain weight through a certain distance, laws of physics >will tell you exactly how much energy is needed. It's irrelevant whether you >are using a diesel engine, steam power, or man power. > ,,, (o o) ==================oOO--(_)--OOo========================== Bob Washburn whiterabbit_at_iw.edwpub.com or rwashbu_at_siue.edu The only difference between a rut and a grave is the depth. ========================================================= *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************
This archive was generated by hypermail 2.4.0 : Thu Aug 21 2025 - 16:32:50 PDT