Bulbous bow - wikipedia Bulbous bow The bulbous bow of the U.S. Navy carrier USS Ronald Reagan made visible in drydock. The bulbous bow of HMS Prince of Wales whilst under construction. A bulbous bow is a protruding bulb at the bow ( or front ) of a ship just below the waterline. The bulb modifies the way the water flows around the hull, reducing drag and thus increasing speed, range, fuel efficiency, and stability. Large ships with bulbous bows generally have twelve to fifteen percent better fuel efficiency than similar vessels without them. A bulbous bow also increases the buoyancy of the forward part and hence reduces the pitching of the ship to a small degree. Bulbous bows have been found to be most effective when used on vessels that meet the following conditions : the waterline length is longer than about 15 metres ( 49.2 ft ) the vessel will operate most of the time at or near its maximum speed Thus, large vessels that cross large bodies of water near their best speed will benefit from a bulbous bow. This would include naval vessels, cargo ships, passenger ships, tankers and supertankers. All of these ships tend to be large and usually operate within a small range of speeds close to their top speed. Bulbous bows are less beneficial in smaller craft and may actually be detrimental to their performance and economy. Thus, they are rarely used on tug boats or recreational craft like powerboats, sailing vessels, and yachts. Contents 1 How it works 2 Development 3 Sonar domes 4 References How it works Graphic demonstrating how the bulbous bow influences water flow ( see text ) The effect of the bulbous bow can be explained using the concept of destructive interference of waves ( see graphic ) : A conventionally shaped bow ( # 2 lower left ) causes a bow wave ( # 4 ). A bulb alone ( # 1 top left ) forces the water to flow up and over it forming a trough ( # 3 ). Thus, if a bulb is added to a conventional bow at the proper position ( # 1 right ), the bulb trough coincides with the crest of the bow wave, and the two cancel out, reducing the vessel 's wake. While inducing another wave stream saps energy from the ship, canceling out the second wave stream at the bow changes the pressure distribution along the hull, thereby reducing wave resistance. The effect that pressure distribution has on a surface is known as the form effect. Some explanations note that water flowing over the bulb depresses the ship 's bow and keeps it trimmed better. Since many of the bulbous bows are symmetrical or even angled upwards which would tend to raise the bow further, the improved trim is likely a by - product of the reduced wave action as the vessel approaches hull speed, rather than direct action of water flow over the bulb. A bulbous bow with a complex shape. The through tunnels in the side are bow thrusters ( July 2006 ). A sharp bow on a conventional hull form would produce waves and low drag like a bulbous bow, but waves coming from the side would strike it harder. The blunt bulbous bow also produces higher pressure in a large region in front, making the bow wave start earlier. The addition of a bulb to a ship 's hull increases its overall wetted area. As wetted area increases, so does drag. At greater speeds and in larger vessels it is the bow wave that is the greatest force impeding the vessel 's forward motion through the water. For a vessel that is small or spends a great deal of its time at a slow speed, the increase in drag will not be offset by the benefit in damping bow wave generation. As the wave counter effects are only significant at the vessel 's higher range of speed, bulbous bows are not energy efficient when the vessel cruises outside of these ranges, specifically at lower speeds. Development USS Lexington displays her bulbous bow in 1925. Although the bulbous bow concept is credited to David W. Taylor, a naval architect who served as Chief Constructor of the United States Navy during the First World War and who used the concept ( known as a bulbous forefoot ) in his design of the USS Delaware, which entered service in 1910, there are earlier examples. Models in the Discovery museum, Newcastle upon Tyne, England of several warships built in Newcastle during the last decade of the 19th century ( notably in the yards of William Armstrong ) show bulbous bows. An illustration of the cruiser USS Albany ( launched 1899 ) which appears in the biography of Armstrong by Henrietta Heald ( 2010 ) appears to show a bulbous bow. It may be of relevance that Armstrong was a hydraulics engineer. The bow design did not initially enjoy wide acceptance, although it was used in the Lexington - class battlecruiser to great success after the two ships of that class which survived the Washington Naval Treaty were converted to aircraft carriers. This lack of acceptance changed in the 1920s, with Germany 's launching of Bremen and Europa. They were referred to as Germany 's North Atlantic greyhounds, two large commercial ocean liners that competed for the trans - Atlantic passenger trade. Both ships won the coveted Blue Riband, Bremen in 1929 with a crossing speed of 27.9 knots ( 51.7 km / h ; 32.1 mph ), and Europa surpassing her in 1930 with a crossing speed of 27.91 knots. The design began to be incorporated elsewhere, as seen in the U.S. built SS Malolo, SS President Hoover and SS President Coolidge passenger liners launched in the late 1920s and early 1930s. Still the idea was largely viewed as experimental by many ship builders and owners. In 1935 the French superliner Normandie was designed by Vladimir Yurkevich combining a bulbous forefoot with massive size and a redesigned hull shape. She was able to achieve speeds in excess of 30 knots ( 56 km / h ). Normandie was famous for many things, including her clean entry into the water and markedly reduced bow wave. Normandie 's great rival, the British liner Queen Mary, achieved equivalent speeds using traditional stem and hull design. However, a crucial difference was that Normandie achieved these speeds with approximately thirty percent less engine power than Queen Mary and a corresponding reduction in fuel use. Bulbous bow designs were also developed and used by the Imperial Japanese Navy. A modest bulbous bow was used in a number of their ship designs, including the light cruiser Ōyodo and the carriers Shōkaku and Taihō. A far more radical bulbous bow design solution was incorporated into their massively large Yamato - class battleship, including Yamato, Musashi and the aircraft carrier Shinano. The modern bulbous bow was developed by Dr. Takao Inui at the University of Tokyo during the 1950s and 1960s, independently of Japanese naval research. Inui based his research on earlier findings by scientists made after Taylor discovered that ships fitted with a bulbous forefoot exhibited substantially lower drag characteristics than predicted. The bulbous bow concept was first definitively studied by Thomas Havelock, Cyril Wigley and Georg Weinblum, including Wigley 's 1936 work `` The Theory of the Bulbous Bow and its Practical Application '' which examined the issues of wave production and damping. Inui 's initial scientific papers on the effect of bulbous bow on wavemaking resistance were collected into a report published by the University of Michigan in 1960. His work came to widespread attention with his paper `` Wavemaking Resistance of Ships '' published by the Society of Naval Architects and Marine Engineers in 1962. It was eventually found that drag could be reduced by about five percent. Experimentation and refinement slowly improved the geometry of bulbous bows, but they were not widely exploited until computer modelling techniques enabled researchers at the University of British Columbia to increase their performance to a practical level in the 1980s. Sonar domes Some warships specialized for anti-submarine warfare use a specifically shaped bulb as a hydrodynamic housing for a sonar transducer, which resembles a bulbous bow but the hydrodynamic effects are only incidental. The transducer is a large cylinder or sphere composed of a phased array of acoustic transducers. The entire compartment is flooded with water and the acoustic window of the bulb is made of fiber - reinforced plastic or another material ( such as rubber ) transparent to underwater sounds as they are transmitted and received. The transducer bulb places the sonar equipment at the greatest possible distance from the ship 's own noise - generating propulsion system. References Wikimedia Commons has media related to Bulbous bows. Jump up ^ Bray, Patrick J. ( April 2005 ). `` Bulbous bows ''. Jump up ^ Wigley, W.C.S. ( 1936 ). The Theory of the Bulbous Bow and its Practical Application. Newcastle upon Tyne. Jump up ^ `` Narciki - Naval Architecture Wiki Project : Bulbous bow ''. Jump up ^ Friedman, Norman ( 1985 ). U.S. Battleships : An Illustrated Design History. Annapolis, Maryland : Naval Institute Press. p. 235. ISBN 978 - 0 - 87021 - 715 - 9. OCLC 12214729. Jump up ^ Kludas, Arnold ( 2000 ). Record breakers of the North Atlantic, Blue Riband Liners 1838 - 1952. London : Chatham. ISBN 1 - 86176 - 141 - 4. Jump up ^ `` Yamato Museum '' ( PDF ). Archived from the original ( PDF ) on 2011 - 06 - 27. Jump up ^ `` Jane 's Underwater Warfare Systems ''. December 5, 2010. Archived from the original on September 13, 2012. Retrieved from `` https://en.wikipedia.org/w/index.php?title=Bulbous_bow&oldid=798263613 '' Categories : Watercraft components Fluid dynamics Nautical terminology Talk Contents About Wikipedia Български Català Deutsch Eesti Español Français Hrvatski Bahasa Indonesia Italiano עברית Nederlands 日本 語 Norsk Polski Русский Srpskohrvatski / српскохрватски Suomi Svenska Türkçe 中文 Edit links This page was last edited on 31 August 2017, at 22 : 07. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: why is there a bulb on the bow of a ship
Answer: modifies the way the water flows around the hull, reducing drag and thus increasing speed, range, fuel efficiency, and stability