Wooden boats and their environment




Ireland has a rich tradition of boat-building, both working craft and racing boats. These boats were designed for specific purposes and particular places, local weather, materials and craftsmanship were incorporated into their designs. Sometimes the designs came from abroad and were adapted for local conditions. Many of these designs are still preserved and active today.

This course is about designing a wooden sailing boat for Lough Derg (County Tipperary) referring to the history and traditions of local construction and water use. Students will learn about the history of boat design and construction, the processes of design and the methods of construction. There will be visits to boatyards and boatbuilders with a particular emphasis on techniques of wooden construction. The final objective is the creation of a new design of sailing craft.

Thursday, December 18, 2014

Chines.....

We have discussed chines and their ability to provide a possible better planing shape for downwind sailing but the possible disadvantage of greater wetted surface area particularly in light air. They are much used in offshore reaching machines and powerboats and off course they are quite fashionable in production cruisers now too. Good article at the bottom of this page from Dave Hollom, who often writes for Seahorse on the subject.


http://www.sailboat-cruising.com/self-build-boat.html


http://www.neverboredinc.com/blog-neverbored-blog/bid/340414/Paddleboard-stability-what-is-it-and-how-much-do-you-need


For dinghy construction the issue is as much about choice of material, ply/fibreglass/cedar/composite as about drag or stability. That said there are some fundamental weaknesses to chine construction (having put my foot through the floor of a mirror...)


http://www.boatdesign.net/forums/sailboats/round-bilge-multiple-hard-chine-sailing-yacht-19259.html


http://www.vsail.info/tag/vo65/page/2/

Team SCA's Volvo 70 and 65 showing their distinct chines
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