The size of waves that we encounter are commonly predicted using three variables: windspeed, duration of wind event and fetch (distance that the wind blows over water). So how big are the waves likely to be? one website provides a handy calculator to estimate wave conditions. if you want to estimate likely wave conditions, use the *calculator* at: http://www.dnv.com/ocean/nbt/Wind/zFrame.htm Note that the predications are for deep water waves. If you paddle in a shallow bay, the conditions you encounter maybe different. certainly there is much more to predicating wave conditions, but this website provides a handy starting place that is online. if you browse the site, you will find much stuff on waves. are there other sites are folks using for wave info? bye bye bliven *************************************************************************** PaddleWise Paddling Mailing List - All postings copyright the author and not to be reproduced/forwarded outside PaddleWise without author's permission Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************
A fun site, Larry. When planning an instrument flight plan we used to use (some still do, but computers are working wonders for some) a "Flight Computer" that had a circular slide rule on one side and on the other a way to calculate drift and ground speed from known winds at a specific altitude depending on direction of travel and True Air Speed. I was looking for my old Flight Computer = E6B or Whiz Wheel, as we called it, and want to play with it to see if the same could be calculated for a kayak given known wind conditions and currents. Has anyone ever done something like this? There are some excellent chapters in "Fundamentals of Kayak Navigation" by David Burch, which provide the underlying formula for the calculations. This doesn't provide a field expedient means for calculating drift correction or Velocity Made Good in order to come up with Course to Steer and Estimated Speed to get to ETE or ETA when planning. He does provide some means for adjusting course to compensate for currents and/or winds using piloting. Of course, there is always a GPS, right? Fred At 07:48 PM 10/29/2000 -0500, Larry Bliven wrote: >are there other sites are folks using for wave info? > >bye bye bliven *************************************************************************** PaddleWise Paddling Mailing List - All postings copyright the author and not to be reproduced/forwarded outside PaddleWise without author's permission Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************
From: "Fred T, CA Kayaker Subject: Re: [Paddlewise] Wind Wave Calculator Plus Current Plus Wind = Dead Reckoning Navigation > A fun site, Larry. > > When planning an instrument flight plan we used to use (some still do, but > computers are working wonders for some) a "Flight Computer" that had a > circular slide rule on one side and on the other a way to calculate drift > and ground speed from known winds at a specific altitude depending on > direction of travel and True Air Speed. I was looking for my old Flight > Computer = E6B or Whiz Wheel, as we called it, and want to play with it to > see if the same could be calculated for a kayak given known wind conditions > and currents. Has anyone ever done something like this? > hi Fred, i haven't seen a Whiz Wheel for Wind Waves.. it would be interesting to look at the formulas to see if one could be fabricated, but for me that project will have to wait. i seem to recall that Chuck Sutherland(?) has produced something like a Whiz Wheel thingy for kayaking. maybe someone on the list knows how to find more information about that gadget. bye bye bliven *************************************************************************** PaddleWise Paddling Mailing List - All postings copyright the author and not to be reproduced/forwarded outside PaddleWise without author's permission Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************
Whiz Wheels or E6B's, here is a off the cuff thought. One has to lay a plot for: Wind speed and Wind Direction True Speed of Kayak (speed without outside interference) Magnetic Course of the kayak Plus Current Speed and Current Direction True Speed of Kayak Magnetic Course of the Kayak Determine the impact of the combined forces of Wind and Current on the speed and course of the kayak to establish Velocity Made Good and Required Heading to maintain course. To me the tough part is determining the separate impact of the wind and current on the speed of the kayak and what the required heading correction to maintain course. Now that is simple enough. Fred If one could take a At 08:42 PM 10/31/2000 -0500, Larry Bliven wrote: >haven't seen a Whiz Wheel for Wind Waves.. it would be interesting to look >at the formulas to see if one could be fabricated *************************************************************************** PaddleWise Paddling Mailing List - All postings copyright the author and not to be reproduced/forwarded outside PaddleWise without author's permission Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************
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