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[I14] leeway angles = AOA

14

From: PETER MOHLER (psmohler@prodigy.net)
Date: Wed 16 Apr 2003 - 18:35:28 BST

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    leeway angles

    An aerodynamics pal of mine worked up a spreadsheet to
    calculate leeway angles for a 14. (Leeway = Angle of
    Attack, AOA)

    It has lots of variables, but if you assume the
    daggerboard is symmetrical and has a chord of 12
    inches and is 40 inches deep (30 X 100 cm) and that
    two heavy dudes are on the trap (400 lbs total, (181
    kg)); then the following AOA will result for the
    indicated hull speed.

    13 kts n 1.3 deg
    10 kts n 2.4 deg
    7.5 kts n 4.3 deg
    5 kts n 9.6 deg
    3 kts n 26.6 deg

    Pete Mohler
    USA 1150
    Almost Lunchtime

    Thanks to Brooke Smith for the spread sheet

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