DWD

[unbusted67]

is Design Waterline Displacement different from displacement?

[delmarrey]

DWD is what it's SUPPOSE to be.

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

[cat man do]

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.

Dave

[GordMay]

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

[Weyalan]

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!