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Old 17-12-2006, 13:01   #1
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is Design Waterline Displacement different from displacement?

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Old 17-12-2006, 13:04   #2
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DWD is what it's SUPPOSE to be.

Displacement is what it ACTUALLY is, depending on how much junk one brings aboard.................................._/)

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Old 17-12-2006, 16:58   #3
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And your design waterline will differ if sailing on Freshwater, Saltwater or Mercury due to differing densities of the liquid.

Just to throw more confusion in.

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Old 18-12-2006, 03:08   #4
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Displacement & Design Waterline Displacement should be* the same.

Displacement is the weight of water equivalent to the immersed volume of the hull.
Design Waterline should be* calculated to include the total amount of weight the boat was designed to carry, hence Displacement at the Design Waterline should* include the combined weight of the boat, occupants, and the cargo & gear

* Design Waterline (Displacement) can be a some what arbitrary number, manipulated by some manufacturers to only include half-full tankage, and other light ship conditions.

See also:

Ted Brewer Presents A Primer on Yacht Design (The Numbers)
Ted Brewer Yacht Design

Sailboat Design Ratios ~ by Dan Pfeiffer
Ratio Formulas

Essential Design Data ~ by Michael Kasten
Essential Design Data

Carl’s Sail Calculator ~ by Carl Adler
Sail Calculator Pro v2.72
Gord May
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Old 20-12-2006, 14:25   #5
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I'd hazard a guess that I am one of the very few people here who's boat is currently floating about 2" above it's DWL!
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