| Built By: | Swan Hunter (Tyne) |
| Build Group: | E3 |
| Fate: | Sold 3rd January 1921. |
8th Flotilla. Harwich.
| Length overall | 181 ft |
| Beam | 15 ft |
| Displacement | 667 tons (surface) |
| 807 tons (submerged) | |
| Diving Depth | 200 ft |
| Speed | Surface 15.25 knots (design) |
| Surface: 1500 miles on full power or 3000 miles at 10 knots (service) | |
| Submerged: 99 miles at 3 knots (design) | |
| Submerged: 10 miles at 9 knots or 65 miles at 5 knots (service) | |
| No. of shafts | 2 |
| Propeller | 3 blades, 5 ft 7 inch diameter |
| Armament | 2 x 18 inch bow tubes |
| 2 x 18 inch beam tubes | |
| 1 x 18 inch stern tube | |
| (10 torpedoes carried) | |
| 1 x 2-pounder gun | |
| Endurance | Surface: 3000 miles at 10 knots (design) |
| Surface: 1500 miles on full power or 3000 miles at 10 knots (service) | |
| Submerged: 99 miles at 3 knots (design) | |
| Submerged: 10 miles at 9 knots or 65 miles at 5 knots (service) | |
| Complement | 3 Officers, 28 Ratings. |
On the 12th January 1950, HM Submarine Truculent spent the day at sea off the Thames Estuary carrying out trials, following a long refit. Apart from the full crew, there were 18 civilian dockyard officials on board to make any last minute adjustments, as she was due to sail for Scotland the next day. As she made her way up to the Medway Approaches, the Officer of the Watch conned the submarine on the surface. Traffic in the river was heavy and the steaming lights of many ships on their way into and out of the Port of London were clearly visible on all sides.
The Royal Navy's Submarine Command Course, or 'Perisher', is a unique course, training, assessing and qualifying officers for submarine command which is, itself, unique, challenging and demanding; the epitome of mission command, with no succour, referral or support in a continuously threatening environment. It is therefore essential that those 'in command' are proven to be worthy and capable of their appointment.
The evolution of 'Perisher' is in recognisable periods: the earliest days, following the submarine's introduction into the Royal Navy, was an autodidactic existence with COs learning from their peers and by experimentation.
By 1917 circumstances had conflated to create the Periscope School and the Periscope Course to train and qualify COs whose characteristics were now fully formed. The interwar period was a difficult time, but it produced new submarines and technological innovations just in time for the Second World War and the most intense evolutionary period for 'Perisher'.
Post-1945 to 1969 experienced two evolutions: Commander Sandy Woodward's codification of the art of attacking and a shift in emphasis from purely 'periscope eye' attacking toward the development of safety and tactical prowess in students. In the 1970s-1980s, two parallel courses satisfied the demand for COs from an expanding diesel-nuclear submarine fleet using SSKs and then in 1989, an SSN.
The final period, 1990-2017 continues today with an all-nuclear Perisher and a curriculum to meet a changing battlespace, new weapons and tactics. Throughout its history, 'Perisher' has shaped the submarine commanding officer and he, in return, has shaped 'Perisher'.
21 pages added or updated in the last 1 month
Please help to maintain this site by reporting any Errors, Broken Links, Information or Site Issues on this page using this button
If you find this site useful, please consider supporting my work with a small Donation.
Please Note: Donations made using this option go directly to the site owner and not to the Submariners Association.
Thankyou for your support.
| Length overall | 181 ft |
| Beam | 15 ft |
| Displacement | 667 tons (surface) |
| 807 tons (submerged) | |
| Diving Depth | 200 ft |
| Speed | Surface 15.25 knots (design) |
| Surface: 1500 miles on full power or 3000 miles at 10 knots (service) | |
| Submerged: 99 miles at 3 knots (design) | |
| Submerged: 10 miles at 9 knots or 65 miles at 5 knots (service) | |
| No. of shafts | 2 |
| Propeller | 3 blades, 5 ft 7 inch diameter |
| Armament | 2 x 18 inch bow tubes |
| 2 x 18 inch beam tubes | |
| 1 x 18 inch stern tube | |
| (10 torpedoes carried) | |
| 1 x 2-pounder gun | |
| Endurance | Surface: 3000 miles at 10 knots (design) |
| Surface: 1500 miles on full power or 3000 miles at 10 knots (service) | |
| Submerged: 99 miles at 3 knots (design) | |
| Submerged: 10 miles at 9 knots or 65 miles at 5 knots (service) | |
| Complement | 3 Officers, 28 Ratings. |
On the 12th January 1950, HM Submarine Truculent spent the day at sea off the Thames Estuary carrying out trials, following a long refit. Apart from the full crew, there were 18 civilian dockyard officials on board to make any last minute adjustments, as she was due to sail for Scotland the next day. As she made her way up to the Medway Approaches, the Officer of the Watch conned the submarine on the surface. Traffic in the river was heavy and the steaming lights of many ships on their way into and out of the Port of London were clearly visible on all sides.
The Royal Navy's Submarine Command Course, or 'Perisher', is a unique course, training, assessing and qualifying officers for submarine command which is, itself, unique, challenging and demanding; the epitome of mission command, with no succour, referral or support in a continuously threatening environment. It is therefore essential that those 'in command' are proven to be worthy and capable of their appointment.
The evolution of 'Perisher' is in recognisable periods: the earliest days, following the submarine's introduction into the Royal Navy, was an autodidactic existence with COs learning from their peers and by experimentation.
By 1917 circumstances had conflated to create the Periscope School and the Periscope Course to train and qualify COs whose characteristics were now fully formed. The interwar period was a difficult time, but it produced new submarines and technological innovations just in time for the Second World War and the most intense evolutionary period for 'Perisher'.
Post-1945 to 1969 experienced two evolutions: Commander Sandy Woodward's codification of the art of attacking and a shift in emphasis from purely 'periscope eye' attacking toward the development of safety and tactical prowess in students. In the 1970s-1980s, two parallel courses satisfied the demand for COs from an expanding diesel-nuclear submarine fleet using SSKs and then in 1989, an SSN.
The final period, 1990-2017 continues today with an all-nuclear Perisher and a curriculum to meet a changing battlespace, new weapons and tactics. Throughout its history, 'Perisher' has shaped the submarine commanding officer and he, in return, has shaped 'Perisher'.
21 pages added or updated in the last 1 month
Please help to maintain this site by reporting any Errors, Broken Links, Information or Site Issues on this page using this button
If you find this site useful, please consider supporting my work with a small Donation.
Please Note: Donations made using this option go directly to the site owner and not to the Submariners Association.
Thankyou for your support.

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