Page 270 - Nicolaes Witsen & Shipbuilding in the Dutch Golden Age

Appendix
Table 1 (continued)
Witsen’s Formulas
Planking: Thickness = 1⁄4 i.s.
Van Yk’s Formulas
Planking:
Thickness = according to table: Length of shipThickness of planks 40–60 feet 2 inches
60–80 feet 2[1⁄2] inches*
80–100 feet 3 inches
100–120 feet 31⁄2 inches 120–140 feet 4 inches
140–160 feet 41⁄2 inches 160–170 feet 41⁄2 inches
(*There are some discrepancies in
Van Yk’s table. The dimension “21⁄2 inches”—for ships of 60–80 feet—is difficult to read in the text and appears to be “21⁄8 inches,” although that does not fit the pattern of the list. Furthermore,
it seems strange that the same thickness of planking is given
for the last two categories: 140– 160-foot ships and 160–170-foot ships. If these dimensions are what Van Yk intended, it is unclear why he did he not combine the two lines in a single category for 140–170-foot ships.)
Floors:
Height = 1 inch per 3 feet W
Width = a little less
Bilge futtocks and futtocks: Thickness at bottom = 9⁄10 of floors Thickness at top = 3⁄4 of floors
Top timbers:
Thickness = 3⁄4 floor futtocks Tumble home: 4 inches per 1 foot of
height
Keelson:
Height = 2⁄3 i.s.
Width = as much as the wood
provides
Lower deck beams:
Height = 2 inches per 5 feet W Width = a bit more
Camber = 6 or 7 inches
Ceiling planks = outside planking
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Floors:
Height = 3⁄4 i.s.
Bilge futtocks and futtocks:
1⁄2 i.s.
Tumble home = 1⁄3 “ ’tween decks” Top timbers:
2⁄5 i.s.
Turn of the bilge:
Width = W − 1⁄10 inch per 1 foot L Height of the turn of the bilge = 1⁄3 D Keelson:
Thickness = 2⁄3 i.s.
Width = wider than the keel
Lower deck beams:
Thickness and width = 11⁄8 × i.s. Camber = 1⁄10 inch per 1 foot L
Ceiling planks:
Thickness = planking (1⁄4 i.s.)