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Re: [I14] leeway angles = AOA

14

From: Alan Smith (alans@arcom.com.au)
Date: Thu 24 Apr 2003 - 12:11:34 BST

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    some typical numbers
    no weather helm

    boat speed 3 knts c of g 0.75 ft to windward of c of b, auw 500 lbs,
    distance from c of e sails to c of e cb 11 ft, force on cb 500 X 0.75 / 11 =
    56.8 lbs, leeway angle 4.7 degrees
    boat speed 8 knots, c of g 5 ft to windward of c of b, force 227 lbs leeway
    angle 2.6 degrees

    a cb area of 3 square ft has been used in these calculation...leeway angle
    is inversely proportional to cb area and the square of boat speed ..run your
    own estimates from the base provided above

    the force on the centre board also induces a drag component which is
    approximately the force times SIN (leeway angle/2) so it is important to
    keep the leeway angle small by using sufficient cb area for the conditions
    of the day

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