Sphinx-class post ship
| Class overview | |
|---|---|
| Name: | Sphinx-class post ships |
| Operators: |
 Royal Navy
|
| Completed: | 10 |
| General characteristics | |
| Type: | Sixth-rate post ship |
| Tons burthen: | 431 37/94 (as designed) |
| Length: |
|
| Beam: | 30 ft 1 in (9.17 m) |
| Depth of hold: | 9 ft 8 in (2.95 m) |
| Propulsion: | Sail |
| Sail plan: | Full-rigged ship |
| Complement: | 140 (reduced to 134 in 1794). |
| Armament: |
|
The Sphinx-class sailing sixth rates were a series of ten post ships built to a 1773 design by John Williams. Although smaller than true frigates, post ships were often referred to incorrectly as frigates by sea officers, but not by the Admiralty or Navy Board.
The first vessel in the class was launched in 1775, six more in 1776, two in 1777 and the last in 1781. The vessels of the class served in the Royal Navy during the American Revolutionary War. Three of them - Sphinx and Ariel in September 1779, and Unicorn in September 1780 - were captured by the French Navy, but Sphinx was recovered in December 1779 and Unicorn in April 1781. Some survived to see service in the French Revolutionary and Napoleonic Wars.
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