It is with deep sorrow that AYRS has to announce that our Chairman, Fred Ball, died on Friday 3rd JanuaryRead more
Report by John Perry – Another busy meeting with a constant flow of presentations from about 09:30 through to 16:30,Read more
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 beRead more
Catalyst 54 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 theRead more
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.Read more
In the Forum at https://www.ayrs.org/phpbb/viewtopic.php?f=37&p=2559 If you’re not already registered on the Forum you will need to register and beRead more
In the Forum at https://www.ayrs.org/phpbb/viewtopic.php?f=37&p=2727#p2727 If you’re not already registered on the Forum you will need to register and beRead more
New Years Resolutions
AYRS relies on the members writing about their experiments and ideas so YOUR No.1 Resolution is to write and let us know what you are doing. Then we can publish it in Catalyst which helps you get your monies worth!
You can also do your bit by encouraging other members to use the forum which means members can get something in between issues of Catalyst.Read more
Several hours of presentations of members’ projects were interspersed with chat over tea/coffee breaks together with a mid-day break for our packed lunches.Read more
Multihulls can be light and fast but cruising ones must never capsize: They stay inverted.
Single hulled yachts can be self-righting and seaworthy, some large and small ones can survive storms and work to windward in gales but to be quick they need deep weighted keels and a wide hull. Built in buoyancy can avoid sinking but they are outperformed by multihulls.
Can a multihull be seaworthy? Could one work to windward in a gale or sail on when mid Atlantic breakers flatten her? What about an automatic system for capsize recovery? Could a multihull heave to in heavy weather and work slowly to windward like a Contessa? Probably not, but perhaps it could be as seaworthy as the offshore racing fleet.