| Name: | PC 51 |
| Type: | Patrol Boat; Decoy Ship |
| Launched: | 1917 |
| Completed: | 1917 |
| Builder: | Tyne Iron Shipbuilding Company |
| Yard: | Willington Quay |
| Yard Number: | 211 |
| Dimensions: | 682disp, 247.0 x 25.6 x 8.5ft |
| Engines: | 2 x steam turbines, 3500ihp |
| Engines by: | |
| Propulsion: | 2 x Screws, 20.0 knots |
| Construction: | Steel |
| Armament: | 1 x 4ins, 2 x 12pdr |
| History: | |
| 1917 | The Admiralty, London |
| 18/01/1923 | Broken up |
| Comments: | 1917: Ordered as a 'P' Class Patrol Boat P 51 |
| 1917: Completed as a Submarine Decoy ‘Q’ Ship with merchant ship profile | |
| 18/01/1923: Sold to Alloa Shipbreaking Co |