Sail Area-Displacement ratio
The Sail Area-Displacement ratio (SA/D) is a calculation used to express how much sail a boat carries relative to its weight.[1]
It is an indicator of the performance of a boat.[2] The higher the SA/D, the more lively the boat's sailing performance:[3]
| Boat Type | SA/D |
|---|---|
| Motorsailers | 13 - 14 |
| Slow auxiliary sailboats | 14 - 15 |
| Average offshore cruisers | 15 - 16 |
| Coastal cruisers | 16 - 17 |
| Racing yachts | 17 - 19 |
| Ultra light racers, class racers, daysailers | 20+ |
SA/D, however, doesn't provide information about a boat behavior in a storm or upwind. A polar diagram from a velocity prediction program gives a more precise view.[4]
See also
References
- Paris, Jay E. "Comparing Design Ratios". Sail Magazine. Retrieved 9 July 2020.
- McGeary, Jeremy. "How Sailboats Measure Up". Cruising World. Retrieved 9 July 2020.
- Sponberg, Eric W. "The Design Ratios" (PDF). Sponberg Yacht Design Inc. Retrieved 9 July 2020.
- Reisberg, Lars. "Sail Area-Displacement Ratio: Skipper´s Basics". No frills sailing. Retrieved 11 July 2020.
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