Usage
Use the following form to calculate a sailboat standard metrics. The formulae are given at the end of this page.
The pre-loaded measurements are that of a Tanzer 7.5 - Just override them with your own values, then click the Calculate! button.
For more information on sailboat metrics, consult the Ted Brewer Yacht Design website.
The Calculator
Metrics formulae explained:
All figures are based on the British Measurement Mystem.
Note: some Displacements are in British Tons (2,000 lbs), some in Long Tons (2,240 lbs).
Metrics | Formula |
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Sail Area - Displacement Ratio | Sail Area / (Displacement in Cubic Feet)2/3 |
Displacement - Length Ratio | (Long Ton Displacement) / (0.01 * LWL)3 |
Theoretical Hull Speed | 1.34 * (LWL)1/2 |
Motion Comfort | Displacement / { 2/3 * [ (0.7 * LWL) + (1/3 * LOA) ] * Beam4/3 } |
Ballast - Displacement Ratio | (Ballast / Displacement) * 100 |
Capsize Screening Formula | Beam / (Displacement in Cubic Feet)1/3 |
In the above formulae: Displacement in Cubic Feet = Displacement in lbs / 64 Displacement in Long Tons = Displacement in lbs / 2,240 |
Calculator designed by D. Servranckx. Page updated on 2022-11-26.
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NOTE: This page must be edited as "the Boss".
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Update log:
2022-11-26_ DS: fixed "balast" to "ballast" spelling.
2022-08-16: DS: minor display tweaks.
2022-01-12: DS: updated default Tanzer 7.5 data using Wikipedia data.
2022-01-11: DS: changed the Motion Confort formula TEXT to show (4/3) instead of (3/4)
2021-04-30: DS: added this section. replaced "Keel Boat" with "Keelboat"
Page maintained by Webmaster.