Thames Measurement

Measurement system approximating the internal volume of a vessel

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:

Thames Tonnage = ( length − beam ) × beam × beam 2 94 {\displaystyle {\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:

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

## See also

[edit]

* Sports portal

* Tonnage – Measure of the volumetric capacity of a ship

## References

[edit]

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

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Ship measurements

Length|

* Length overall
* Length between perpendiculars
* Length at the waterline

Breadth|

* Beam

Depth|

* Draft
* Moulded depth
* Freeboard
* Load line (Plimsoll Line)
* Under keel clearance

Height|

* Air draft

Volume|

| Worldwide|

* Tonnage
* Gross tonnage
* Compensated gross tonnage
* Net tonnage
* Underdeck 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
* Moorsom System

Weight|

* Displacement
* Loaded displacement
* Standard displacement
* Light displacement
* Normal displacement

Stability|

* Inclining test
* List
* Angle of loll
* Metacentric height (GM)

Limits|

* Aframax
* Baltimax
* Capesize
* Chinamax
* Handymax/Supramax
* Handysize
* Malaccamax
* Panamax and § Neopanamax
* Péniche
* Q-Max (Qatar-max)
* Seawaymax
* Suezmax
* VLCC and ULCC
* Yamalmax

* v
* t
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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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