Scale 1:48. Plan showing the body plan with stern board decoration and name on the stern counter, sheer lines with inboard detail and figurehead, and longitudinal half breadth for Syren/Siren (1773), a 28-gun, Sixth Rate Frigate, as built by Henri at Chatham.

The plan also includes pencil modifications for converting a troop ship for 300 troops and 105 ships company. This may not be for Siren (1773), could be for another member of the Enterprize Class.

NMM, Progress Book, volume 5, folio 303, states that 'Syren' was launched at Hennicker's Yard, Chatham on 2 November, arriving at Chatham Dockyard on the same day. She was docked on 16 August 1775 and undocked on 8 September 1775,sailing on 5 October 1775 having been fitted for foreign service.