RN Subs

Truncheon (P353)

HMS Truncheon following 1953 conversion for greater speed.

HMS Truncheon in 1951, prior to her conversion to an extended T boat, with minor structural modifications and a US Navy JT type sonar (tee shaped device on forward casing.

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1950/1951, moderately streamlined for noise reduction, by the removal of the gun and other appendages. The bow external tubes were removed but this was widespread in the post-war fleet. It is notable the stern facing midship tubes were retained. As was the snort. The purpose of this modest conversion was the fitting of USN JT sonar. Various Submarine vs Submarine exercises and trials were carried with scientists aboard. The submarine was fully operational. Later in 1951 the submarine was taken to Chatham to be converted into a stretched high underwater speed, fully streamlined submarine.

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