| History | |
|---|---|
&sq=&lang=&file=File:Naval_Ensign_of_Sweden.svg){kind=small} Sweden | |
| Name | Ulla Fersen |
| Builder | Karlskrona naval shipyard |
| Launched | 15 August 1789 |
| Captured | 1796 and 1801 (Detained and released) |
| Fate | Sank 20 April 1807 |
| Notes | Rebuilt 1802 |
| General characteristics | |
| Length | 33.55 m (110 ft 1 in) (113 Swedish ft) |
| Beam | 9.07 m (29 ft 9 in) (30 Swedish ft 6 Swedish in) |
| Draft | 4.0 m (13 ft 1 in) (13 Swedish ft 6 Swedish in) |
| Armament | 18 × Swedish 6-pounder cannon |
HSwMS Ulla Fersen was a frigate of the Swedish Royal Navy, designed by Frederik H. Chapman, and launched in 1789. She served during the Russo-Swedish War (1788-1790), most notably at the Battle of Reval. British vessels twice detained her, once in 1798 and again in 1801, with the first event resulting in a major court case bearing on the meaning of neutrality. She was completely rebuilt in 1802, and lost in a storm in 1807.