A gooseneck is a 180° pipe fitting at the top of a vertical pipe that prevents entry of water. Common implementations of goosenecks are ventilator piping or ducting for bathroom and kitchen exhaust fans, ship holds, landfill methane vent pipes, or any other piping implementation exposed to the weather where water ingress would be undesired, it is so named because the word comes from the similarity of pipe fitting to the bend in a goose's neck. Gooseneck may refer to a style of kitchen or bathroom faucet with a long vertical pipe terminating in a 180° bend. To avoid hydrocarbon accumulation, a thermosiphon should be installed at the low point of the gooseneck. Gooseneck, Lead Leaded goosenecks are short sections of lead pipe used during the early 1900s up to World War Two in supplying water to a customer; these lead tubes could be bent, allowed for a flexible connection between rigid service piping. The bent segments of pipe took the shape of a goose's neck, are referred to as “lead goosenecks.”
Lead is no longer permitted in new building construction. Goosenecks are in-line components of a water service running from the distribution system water main to a meter or building inlet; the valve used to connect a small-diameter service line to a water main is called a corporation stop. One gooseneck joins the corporation stop to the water service pipe work. A second gooseneck links the supply pipeline to a water meter located outside the building. Swan neck duct
A jet engine is a type of reaction engine discharging a fast-moving jet that generates thrust by jet propulsion. This broad definition includes airbreathing jet engines. In general, jet engines are combustion engines. Common parlance applies the term jet engine only to various airbreathing jet engines; these feature a rotating air compressor powered by a turbine, with the leftover power providing thrust via a propelling nozzle – this process is known as the Brayton thermodynamic cycle. Jet aircraft use such engines for long-distance travel. Early jet aircraft used turbojet engines which were inefficient for subsonic flight. Most modern subsonic jet aircraft use more complex high-bypass turbofan engines, they give higher speed and greater fuel efficiency than piston and propeller aeroengines over long distances. A few air-breathing engines made for high speed applications use the ram effect of the vehicle's speed instead of a mechanical compressor; the thrust of a typical jetliner engine went from 5,000 lbf in the 1950s to 115,000 lbf in the 1990s, their reliability went from 40 in-flight shutdowns per 100,000 engine flight hours to less than 1 per 100,000 in the late 1990s.
This, combined with decreased fuel consumption, permitted routine transatlantic flight by twin-engined airliners by the turn of the century, where before a similar journey would have required multiple fuel stops. Jet engines date back to the invention of the aeolipile before the first century AD; this device directed steam power through two nozzles to cause a sphere to spin on its axis. It was seen as a curiosity. Jet propulsion only gained practical applications with the invention of the gunpowder-powered rocket by the Chinese in the 13th century as a type of firework, progressed to propel formidable weaponry. Jet propulsion technology stalled for hundreds of years; the earliest attempts at airbreathing jet engines were hybrid designs in which an external power source first compressed air, mixed with fuel and burned for jet thrust. The Caproni Campini N.1, the Japanese Tsu-11 engine intended to power Ohka kamikaze planes towards the end of World War II were unsuccessful. Before the start of World War II, engineers were beginning to realize that engines driving propellers were approaching limits due to issues related to propeller efficiency, which declined as blade tips approached the speed of sound.
If aircraft performance were to increase beyond such a barrier, a different propulsion mechanism was necessary. This was the motivation behind the development of the gas turbine engine, the commonest form of jet engine; the key to a practical jet engine was the gas turbine, extracting power from the engine itself to drive the compressor. The gas turbine was not a new idea: the patent for a stationary turbine was granted to John Barber in England in 1791; the first gas turbine to run self-sustaining was built in 1903 by Norwegian engineer Ægidius Elling. Such engines did not reach manufacture due to issues of safety, reliability and sustained operation; the first patent for using a gas turbine to power an aircraft was filed in 1921 by Frenchman Maxime Guillaume. His engine was an axial-flow turbojet, but was never constructed, as it would have required considerable advances over the state of the art in compressors. Alan Arnold Griffith published An Aerodynamic Theory of Turbine Design in 1926 leading to experimental work at the RAE.
In 1928, RAF College Cranwell cadet Frank Whittle formally submitted his ideas for a turbojet to his superiors. In October 1929 he developed his ideas further. On 16 January 1930 in England, Whittle submitted his first patent; the patent showed a two-stage axial compressor feeding a single-sided centrifugal compressor. Practical axial compressors were made possible by ideas from A. A. Griffith in a seminal paper in 1926. Whittle would concentrate on the simpler centrifugal compressor only. Whittle was unable to interest the government in his invention, development continued at a slow pace. In 1935 Hans von Ohain started work on a similar design in Germany, both compressor and turbine being radial, on opposite sides of same disc unaware of Whittle's work. Von Ohain's first device was experimental and could run only under external power, but he was able to demonstrate the basic concept. Ohain was introduced to Ernst Heinkel, one of the larger aircraft industrialists of the day, who saw the promise of the design.
Heinkel had purchased the Hirth engine company, Ohain and his master machinist Max Hahn were set up there as a new division of the Hirth company. They had their first HeS 1 centrifugal engine running by September 1937. Unlike Whittle's design, Ohain used hydrogen as fuel, supplied under external pressure, their subsequent designs culminated in the gasoline-fuelled HeS 3 of 5 kN, fitted to Heinkel's simple and compact He 178 airframe and flown by Erich Warsitz in the early morning of August 27, 1939, from Rostock-Marienehe aerodrome, an impressively short time for development. The He 178 was the world's first jet plane. Heinkel applied for a US patent covering the Aircraft Power Plant by Hans Joachim Pabst von Ohain in May 31, 1939. Austrian Anselm Franz of Junkers' engine division introduced the axial-flow compressor in their jet engine. Jumo was assigned the next engine number in the RLM 109-0xx numbering sequence for gas turbine aircraft powerplants, "004", the result was t