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| Name | Impregnable IV (launched as Circe, 1827) | Explanation | |
| Type | Fifth rate | ||
| Launched | 22 September 1827 | ||
| Hull | Wooden | ||
| Propulsion | Sail | ||
| Builders measure | 1079 tons | ||
| Displacement | |||
| Guns | 46 | ||
| Fate | 1922 | ||
| Class | Modified Leda | ||
| Ships book | |||
| Note | 1866 h.s. 1916 = Impregnable IV | ||
| Snippets concerning this vessels career | |||
| Date | Event | ||
| (January 1840) | Out of commission at Plymouth | ||
| 1916 | Renamed Impregnable IV | ||
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