At 03:52 PM 5/9/2005 -0700, Dave Kruger wrote: >From: "PeterO" <rebyl_kayak_at_iprimus.com.au> > >>First I may be confusing the effects of primary and secondary stability, >>[snip] >> >>Pinning down 'comfortable ride' When paddling in flat water my Pittarak >>feels quite tippy compared with a hard chined wooden boat that I borrow >>occasionally. >> >>When paddling these boats unloaded, through 1 to 1.5 meter rebound, I mostly >>use my hips rather than a brace stroke to 'edge' the boat vertical leaning >>into the waves a bit. With the tippy Pittarak this is done unconsciously and >>came naturally with no need to practice. With the more stable chined boat I >>need to work consciously and harder with my hips or else allow the boat to >>tip from the vertical, which is mildly disorienting and encourages the need >>to low brace. > >Peter, I believe your "more comfortable" corresponds to the boat which is >less affected by changes in the angle of the sea surface from horizontal >... meaning: the boat with lesser initial stability (the Pittarak) >demands less conscious effort on your part to maintain an even >keel. OTOH, the greater inital stability of the hard chined wooden boat >makes it rotate more around its long axis in response to seas ... which I >think makes it feel "less comfortable" to you. > >I don't believe in either case are you describing the boats on edge, so it >is mainly their initial stability which you are comparing. Agreed. And just so there is no confusion: initial stability is the same thing as primary stability. Both terms describe the amount of resistance there is to moving the kayak from a "resting" state to a tilted state. A boat with high initial (primary) stability would provide more resistant to edging toward a wave. With more resistance the boat will tend to follow the shape of the wave, moving your center of gravity away from your center of buoyancy, resulting in a more uncomfortable ride. John Fereira jaf30_at_cornell.edu Ithaca, NY *************************************************************************** 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 Tue May 10 2005 - 03:38:35 PDT
This archive was generated by hypermail 2.4.0 : Thu Aug 21 2025 - 16:31:20 PDT