Reality can be fun: Good friends can make even the boatyard jobs enjoyable (page 11)
Keel and rudder arrangements (p26)Cantilevers A gallows, a balcony and a crane are typical cantilevers. ‘F’ marks the likely failure point. (Figure 1. Page 27)An 80kg (176lbs) guy enjoys a drink at the end of a 2meter (6’6″) balcony. The stress at point F is the sum of his weight multiplied by the length of the balcony. (Figure 2 page 28).As the length of the balcony increases, so does the stress at point F.Like the balcony, the spade rudder is supported at just a single point (F) with the rudder acting like a giant cantilever to increase the stress at point F. (Fig 4. Page29)Sticking out like a Scotsman at a charity gala, the spade rudder is a very vulnerable structure known to engineers as a ‘cantilever’. (Fig 5, Page 30)As the waves roll past, the force they produce is multiplied by the length of the rudder, causing the shaft to flex at poinf F. Wave after wave, hour after hour, day after day. (Fig 6. Page 32)Oops, where did my rudder go? (Fig 7. Page33).Figure 8. Page 33Any two dissimilar metals in a salty solution will produce an electric current. (Fig 9. Page 34)
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