Thames Measurement

Thames Measurement, also known as Thames Tonnage, is a system for measuring ships and boats. It was created in 1855 as a variation of Builder's Old Measurement by the Royal Thames Yacht Club, and was designed for small vessels, such as yachts. It was originally used for calculating the port dues for yachts; the formula was also used in some early handicapping systems for yacht racing.^[1]

The calculation of Thames Tonnage uses the following formula:

{\text{Thames Tonnage}}={\frac {({\text{length}}-{\text{beam}})\times {\text{beam}}\times {\frac {\text{beam}}{2}}}{94}}

where:

length is the length, in feet, from the stempost to sternpost;
beam is the maximum beam, in feet.^[1]

This can be simplified as:

{\text{Thames Tonnage}}={\frac {({\text{length}}-{\text{beam}})\times {\text{beam}}^{2}}{188}}

References

1 2 Kemp, Peter, ed. (1979). The Oxford Companion to Ships and the Sea. Oxford: Oxford University Press. p. 864. ISBN 0-19-211553-7.

Ship measurements

Length

Breadth

Beam

Depth

Volume

Worldwide	Tonnage Gross tonnage Compensated gross tonnage Net tonnage

Specialized	Panama Canal/Universal Measurement System Thames measurement tonnage

Archaic	Gross register tonnage Net register tonnage

Capacity

Current	Deadweight tonnage Twenty-foot equivalent unit (Intermodal containers)

Archaic	Builder's Old Measurement (sailing vessels) Moorsom System (steamships)

Weight

Stability

Limits

Handicapping rules in sailing

International Measurement System International Offshore Rule IRC Offshore Racing Congress Rule Performance Handicap Racing Fleet Portsmouth Yardstick SRS Thames Measurement

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Thames Measurement

See also

References