Page 274 - Nicolaes Witsen & Shipbuilding in the Dutch Golden Age

Appendix
Table 1 (continued)
Witsen’s Formulas
Rake of the main mast:
11⁄8 inches per 10 feet D
Rake of the foremast:
2 inches per 10 feet D
Rake of the mizzenmast:
1 inch per 10 feet D Mainmast:
Length=2(W+D)
Thickness = 1 foot per 6 feet D
Foremast:
Dimensions = 7⁄8 main mast
Mizzenmast:
Dimensions = 3⁄4 main mast
Bowsprit:
Dimensions = 3⁄4 main mast
Main-topmast:
Length = 5⁄8 mainmast
Thickness = 5⁄6 mast top
Mizzen topmast:
Length = 1⁄3 main-topmast
Thickness = not specified Spritsail topmast:
Length = 1⁄3 bowsprit + 2 feet Thickness = not specified Main-topgallant mast: Length = 1⁄3 main-topmast Thickness = not specified Fore-topgallant mast:
Length = 8⁄9 fore topmast
Thickness = not specified
Van Yk’s Formulas
256
Mainmast:
Length=3×W(for biggerships,3 × 25 + as many feet as W is more than 25)
Thickness = 3⁄4 W in inches Foremast:
Length = 9⁄10 main mast Thickness = 9⁄10 main mast Mizzenmast:
Length = 3⁄4 main mast
Thickness = 3⁄4 main mast Bowsprit:
Length = 3⁄8 L
Thickness = between main and
foremast Main-topmast:
Length = 5⁄3 W
Thickness = 4⁄5 mainmast Fore topmast:
Length = 9⁄10 main-topmast
Thickness = 4⁄5 foremast
Mizzen topmast:
Length = 11⁄10 main-topgallant mast Thickness = 4⁄5 mizzenmast
Spritsail topmast:
Length = 5⁄6 main-topgallant mast Thickness = main-topgallant mast Main-topgallant mast:
Length = 3⁄4 W
Thickness = 7⁄8 topmast Fore-topgallant mast:
Length = 5⁄6 main-topgallant mast Thickness = like main-topgallant mast Mainmast flagpole:
Length = 8⁄7 main-topgallant mast Thickness = a little thicker
Foremast flagpole:
Length = 8⁄7 fore-topgallant mast Thickness = a little thicker Mizzenmast flagpole:
Length = 5⁄6 mizzen topmast Thickness = half of mizzen topmast