Page 275 - Nicolaes Witsen & Shipbuilding in the Dutch Golden Age

Pinas Drawings
Witsen’s Formulas
Van Yk’s Formulas
Bowsprit flagpole:
Length = 3⁄4 spritsail topmast
Thickness = 1⁄2 spritsail topmast Poop deck flagpole:
Length and thickness = mainmast flagpole
Main yard:
Length = 6⁄16 × (L + W)
Thickness = 1 inch per 4 feet length of the yard
Foreyard:
Length = 6⁄7 main yard
Thickness = 1 inch per 4 feet length of the yard
Mizzen yard:
Length = between mainyard and foreyard
Thickness = 1 inch per 4 feet length of the yard
Spritsail yard:
Length = 5⁄8 main yard
Thickness = 1 inch per 4 feet length of the yard
Main topsail yard:
Length = 4⁄7 main yard
Thickness = 1 inch per 4 feet length of the yard
Fore topsail yard:
Length = 4⁄7 foreyard
Thick = 1 inch per 4 feet length of the yard
Crossjack yard:
Length = main topsail yard
Thickness = 1 inch per 6 feet length of the yard
Mizzen topsail yard:
Length = 4⁄7 crossjack yard Thickness = 1 inch per 4 feet length of the yard
Spritsail topsail yard:
Length = 4⁄7 spritsail yard
Thickness = 1 inch per 4 feet length of the yard
Main-topgallant yard:
Length = 1⁄2 main topsail yard Thickness = 1 inch per 4 feet length of the yard
Main yard:
Length = 2 × W + 1 × D
Thickness = 3⁄4 mainmast
Foreyard:
Length = 6⁄7 main yard
Thickness = not specified
Mizzen yard:
Length = length of mizzenmast + 1 or 2 feet
Thickness = not specified
Spritsail yard:
Length = 3⁄4 bowsprit
Thickness = not specified
Main topsail yard:
Length = 1⁄2 main yard plus
Thickness = not specified
Fore topsail yard:
Length = 1⁄2 foreyard minus
Thickness = not specified
Spritsail topsail yard:
Length = 1⁄3 bowsprit
Thickness = not specified
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