| Designed by: | Norman Hart and built by a total of thirteen firms, Rebuilt |
| Construction | Hard Chine prefabricated double diagonal mahogany hull. Plywood frames. Hull subdivided into watertight compartments. Two underslung rudders. |
| Dimensions | Overall Length: 110 ft. Beam: 17 ft 5 in. Draught: 5 ft fwd, 6ft 3ins aft. Freeboard: 6 ft. |
| Displacement | As designed: 72 tons |
| Machinery | Three Half-Scott Defenders. 12 Cylinder, Supercharged. 100 Octane Petrol. 900 HP Side Exhaust. Aux Engine: Stuart Turner, Lighting Set. |
| Speed | 26.6 Knots at 2100 RPM Max: 23.6 Knots at 1700 RPM Continuous. |
| Endurance | 500 Nautical Miles at 12 Knots. |
| Fuel capacity | 1800 Galls. Flexible Tanks were later fitted for 2600 galls. |
| Heating and Cooking | Parrafin heating and cooking later changed to coal heating. |
| Wheelhouse and Steering | Originally inside hydraulic steering. Later changed to dual with upper bridge steering in armour plated upper bridge. |
| Communications | W/T Radar (Type 286). Echo Sounding Sets. CSA Smoke Apparatus. |
| Compliment | 2 Officers, 14 Men. |
| Armament | One 2-Pounder QF Mark IIC Gun on Mark XV (Power) Mounting. Two twin 0.5 inch Vickers Machine Guns in Mark V (Power) mountings, midships. One Rolls Royce 2 Pounder aft. Two Twin Vickers 0.303 GO Machine Guns on Bridge. Later re-armed with two 2 Pounder mountings fore and aft; Single or Twin Oerlikons in place of Twin 0.5 Vickers; Twin 20mm Oerlikon midships; Four Depth Charges located Two each side aft. |