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| 1 | Chile's Almirante Latorre was expropriated by Great Britain during World War I, and served as HMS Canada, and fought at Jutland. She was re-purchased by Chile after the war. Her sister was completed as a carrier and served as HMS Eagle. |
| 2 | Germany's SMS Goeben, the sister to SMS Moltke and SMS Breslau, a light cruiser of the Breslau class, was sold to Turkey in the opening days of World War I, and served that country as the Yavuz and Medilli. |
| 3 | HMS Revenge class all had the smaller secondary inline rudder removed, but none of our sources specifies exactly when this took place. Raven and Roberts gives the most info. Also, a member of this class, HMS Royal Sovereign, was loaned to Russia from 1944-49, serving as the Arkhangelsk. |
| 4 | The pre-dreadnoughts USS Mississippi and her sister USS Idaho were sold to Greece in 1914, and served out their days as the Kilkis and Lemnos. |
| 5 | Great Britain's battle cruisers of the HMS Courageous class were converted to aircraft carriers in 1928. Their half-sister, HMS Furious, was converted to a carrier before it was originally completed in 1917. |
| 6 | Great Britain's carrier HMS Indomitable was a half sister to HMS Illustrious, having a half-hanger added. |
| 7 | Great Britain's carrier HMS Eagle (the second one), was launched in 1946. Work stopped for three years, and then the ships were completed in the 1950's, Eagle as planned, sister Ark Royal was modified and completed with an angled flight deck. The ships had twin stern rudders (176 sq. ft. each) and one small (56 sq. ft.) retractable auxiliary rudder forward in the bow. This forward rudder was later removed, but no date is given. |
| 8 | Great Britain's light carrier HMS Vindictive was a conversion from a Hawkins class cruiser hull, basically a smaller version of HMS Furious with fore and aft flight decks. |
| 9 | None of Great Britain's HMS Majestic class light carriers ended up serving in the RN, but were completed and sold to Canada, Australia, and India post-war. |
| 10 | Great Britain's escort carriers transferred from the U.S. |
| 11 | Great Britain's escort carriers transferred from the U.S., similar to U.S. Bogue class, HMS Attacker were merchant conversions, Ameer were laid down as carriers. |
| 12 | Great Britain's escort carriers, converted bulk grain carriers, many continued to carry cargo after conversion. |
| 13 | Great Britain's escort carriers, converted oil tankers, many continued to carry cargo after conversion. |
| 14 | Japan's light carriers of Chitose class were originally seaplane carriers, and also carried midget submarines, before being converted to true carriers. |
| 15 | Japanese Army amphibious assault ships with the capability of flying off JAAF aircraft in support of beach-head landings and rapid establishment of land-based air unit. May not have had recovery capabilities. |
| 16 | Japanese Army escort carrier, used JAAF aircraft, intended for escort of troop convoys. |
| 17 | US carriers Saratoga (B) and Enterprise (B) were the surviving members of the Lexington and Yorktown classes that received the bulge refits. |
| 18 | US light carriers of Independence class were conversions from the USS Cleveland cruiser hull. |
| 19 | US light carriers of the Saipan class were conversions from the USS Baltimore cruiser hull. |
| 20 | German light cruisers SMS Pillau and SMS Strassburg transferred to Italy's part of the World War I peace terms, and served in WWII as Bari and Taranto. |
| 21 | 2 light cruisers, Dragon and Danae, transferred to Poland, and served as Dragon and Conrad. |
| 22 | US Omaha class cruiser USS Milwaukee transferred to Russia in 1944 and served as Murmansk. |
| 23 | The US Destroyer Escorts have been added as Destroyers, because they were essentially equivalent to WWI Destroyers. |
| 24 | The last five members of the Fletcher Class (DD800-804) were completed with twin rudders, like those in the Sumner Class. |
| 25 | The Swedish Destroyers Psilander (ex Giovanni Nicotera) and Puke (ex Bettina Ricasoli) were purchased from Italy in 1940. |
| 26 | The Yamato's secondary inline rudder was not used in conjunction with the main rudder. It was designed as a 'spare'. When tested, it proved to be ineffective in use by itself. |
| 27 | Due to the terms of the Washington Treaty, the Mogami class cruisers were originally constructed as 6 inch cruisers, but were designed with the intention of upgrading them to 8 inch cruisers at a later date. This refit was undertaken in 1939 and completed, one of the rare cases in which the major guns were removed and replaced with a larger weapon and the ships returned to service. |
| 28 | The second member of the Richeleau class, the Jean Bart, participated in WWII in an incomplete state, and was finally completed with extensive modifications after the war. These modifications included bulges and resulted in a higher standard displacement, which result sin the Jean Bart receiving 6.5 units. |
| 29 | Conflicting sources on the number of rudders has surfaced. Under investigation, but best source still claims just one rudder. |
| 30 | Members of these German classes awarded to Italy and/or France as WWI war reparations after the war., and the ships served in the Italian/French navies. |
| 31 | Former British Acasta Class (Porpoise), sold to Brazil as Alexandrino Dealenca in 1920, renamed Maranhao in 1927. |
| 32 | All or portions of this Chilean class were building in Britain, and were taken over by Britain at the start of World War I, the survivors were sold to Chile in 1920. |
| 33 | 2 members of Portugal's Douro class were purchased by Columbia in 1933. |
| 34 | 2 ships also had 1 18.0" gun trained to starboard in 1918. |
| 35 | This ship was originally Russian, was captured by the British in 1918, given to Estonia in 1919, and sold to Peru in 1933. |
| 36 | Members of this Italian class sold to Romania and Spain. The Romanian ships were later captured by Russia. |
| 37 | Members of this Italian class sold to Spain. |
| 38 | Two members of this Spanish class sold to Argentina. |
| 39 | Two British N-class Destroyers were transferred to Netherlands and 1 was transferred to Poland. |
| 40 | Greek vessels seized and served in French Navy during 1917-18. |
| 41 | 2 prop shafts removed between wars |
| 42 | Served first as a merchant submarine, to get past the English blockade |
| 43 | Members of class also served in the Japanese navy |
| 44 | Vessel of this class served in Italian navy, and some went on to serve in German navy after Italy dropped out of the conflict. |
| 45 | Members of class served in Italian, then German and then Japanese navies |
| 46 | 1 vessel captured and served in German Navy |
| 47 | Vessels also served in German Navy |
| 48 | 2 Vessels transferred to Netherlands Navy in 1943 and 1945 |
| 49 | U505, captured by US, and served as Nemo |
| 50 | Building for Turkey, taken over by Germany when war broke out. |
| 51 | Conflicting sources on Length. For Cagni, Conway's lists at 288 feet, while Subs of WWII lists at 228 feet. For Romolo, Conway's lists at 284 feet while Subs of WWII lists at 232 feet. Looking for more sources to decide the issue. |
| 52 | Ex-British or US vessel transferred to Allied nation during World War II. Includes ships transferred to Russia to satisfy claims for Italian war reparations. |
| 53 | Some of the members of this Netherlands class were towed to Britain and completed there, while others were captured and completed by Germany.. |
| 54 | Members of this class were captured by the Russians. |
| 55 | During World War I, vessels of this class were captured by Germany, surrendered to Britain, and then later given to the White Russians and served in what was known as 'Wrangel Fleet'. |
| 56 | The US Navy never referred to the Alaska class as battlecruisers, but instead classed them as 'Large Cruisers'. Since they are the only vessels of this 'class', historically since the first days of the ship list they have been included as battlecruisers because they match the definition of battlecruiser better than that of a heavy cruiser. |
