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2. Deck gun - Wikipedia

   en.wikipedia.org/wiki/Deck_gun

   The cruiser submarines USS Argonaut, Narwhal and Nautilus were each fitted with two 6"/53 caliber guns Mark 18 (152 mm) as built in the 1920s, the largest deck gun to be fitted on any United States submarine. [8] In the Royal Navy, the Amphion-class submarine HMS Andrew was the last British submarine to be fitted with a deck gun (a QF 4 inch Mk ...

3. Wide chord - Wikipedia

   en.wikipedia.org/wiki/Wide_chord

   The wide chord fan on a Rolls-Royce Trent 970B- 84 installed on a British Airways Airbus A380. Wide chord describes the fan blades on certain turbofan engines that have a blade design with a specific geometry - In layman's terms, they would be described as having wider blades than other jet engines.

4. QF 4-inch naval gun Mk IV, XII, XXII - Wikipedia

   en.wikipedia.org/wiki/QF_4-inch_naval_gun_Mk_IV...

   The QF 4-inch gun Mk IV [note 1] was the main gun on most Royal Navy and British Empire destroyers in World War I. It was introduced in 1911 as a faster-loading light gun successor to the BL 4 inch Mk VIII gun. Of the 1,141 produced, 939 were still available in 1939. [1] Mk XII and Mk XXII variants armed many British interwar and World War II ...