Zoom Meeting – 10 October 2020
As part of our August Zoom meeting Skip Johnson gave us a short summary of his proa building and sailing
Read moreAuthor: AYRS Webmaster
AYRS Zoom meeting Saturday, 12 September 2020 at 19:30 BST
For this meeting we will have a discussion about the recent evolution of the America’s Cup. John Perry will introduce
Read more27 July – site down for server maintenance (completed)
Our ISP have upgraded our server; you now need to use TLS1.2 if you have it. NOTE: Windows7 computers do
Read moreCoronavirus
As you may guess, at this point in time, AYRS is postponing or cancelling all activities that may bring groups of people together. We are reviewing this on a month by month basis.
The SW UK Area meeting is therefore cancelled (but see below), and the Norfolk sailing meeting (Broad Horizons 2020) is postponed at least until mid-late June.
It is possible that some meetings may be replaced by online video conferences (by Skype or similar). For further details please see the Forum where these things will be announced.
Read moreCatalyst 55 is now available for paid-up members
In the Forum at https://www.ayrs.org/phpbb/viewforum.php?f=37 If you’re not already registered on the Forum you will need to register and be
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Optimization of the length of a Surf-Ski Kayak
This project has been undertaken with the aim of finding a method by which the length of a surfski kayak can be optimised in terms or having least possible resistance. Surf ski kayaking is a highly competitive international discipline that takes place on open ocean, it differs from other forms of kayaking because of the lack of regulations regarding the length of the boats. An aim of this work was to determine if the boats on the market today are fully optimised in terms of having a length with least resistance. Through use of software that incorporates thin ship theory as well as skin friction data from ITTC ’57 it was possible to calculate the wave making and frictional resistances for a series of lengths of Wigley hull forms with constant displacement and beam. This allowed a total resistance to be calculated for each length which in turn leads to an apparent ‘optimum’ length. In terms of boats currently available, it appears from the results that they have indeed been optimised effectively however only for a small weight range of user. A conclusion of this work is that there may well be scope for manufacturers to produce boats better suited for other weight ranges of kayaker or paddler as they are more often known.
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