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Junk Head
A junk head is a form of piston engine cylinder head, where the head is formed by a dummy piston mounted ''inside'' the top of the cylinder. In most other engine designs, the cylinder head is mounted on top of the cylinder block. That form has also been termed a "poultice head". It is essential for any piston engine to seal the joint between block and head. This is usually done by means of a head gasket, a flat gasket on the surface of the block. In early engines, the high pressures and high temperatures made this a difficult trial for the materials of the day and gasket failures were common. The junk head requires no head gasket and is sealed by piston rings inside the cylinder bore, as for the power piston. An alternative solution was the monobloc engine, where the block and head were formed as one piece. This solved the sealing problem, but complicated manufacture and maintenance. Particularly when routine maintenance still required frequent head removal for de-coking, on a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Knight Sleeve-valve Engine, Sectioned Head, Inlet Stroke (Autocar Handbook, Ninth Edition)
A knight is a person granted an honorary title of knighthood by a head of state (including the Pope) or representative for service to the monarch, the church or the country, especially in a military capacity. Knighthood finds origins in the Greek ''hippeis'' and ''hoplite'' (ἱππεῖς) and Roman '' eques'' and ''centurion'' of classical antiquity. In the Early Middle Ages in Europe, knighthood was conferred upon mounted warriors. During the High Middle Ages, knighthood was considered a class of lower nobility. By the Late Middle Ages, the rank had become associated with the ideals of chivalry, a code of conduct for the perfect courtly Christian warrior. Often, a knight was a vassal who served as an elite fighter or a bodyguard for a lord, with payment in the form of land holdings. The lords trusted the knights, who were skilled in battle on horseback. Knighthood in the Middle Ages was closely linked with horsemanship (and especially the joust) from its origins in the 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graphite
Graphite () is a crystalline form of the element carbon. It consists of stacked layers of graphene. Graphite occurs naturally and is the most stable form of carbon under standard conditions. Synthetic and natural graphite are consumed on large scale (300 kton/year, in 1989) for uses in pencils, lubricants, and electrodes. Under high pressures and temperatures it converts to diamond. It is a weak conductor of heat and electricity. Types and varieties Natural graphite The principal types of natural graphite, each occurring in different types of ore deposits, are * Crystalline small flakes of graphite (or flake graphite) occurs as isolated, flat, plate-like particles with hexagonal edges if unbroken. When broken the edges can be irregular or angular; * Amorphous graphite: very fine flake graphite is sometimes called amorphous; * Lump graphite (or vein graphite) occurs in fissure veins or fractures and appears as massive platy intergrowths of fibrous or acicular crystalline ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fleet Air Arm Museum
The Fleet Air Arm Museum is devoted to the history of British naval aviation. It has an extensive collection of military and civilian aircraft, aero engines, models of aircraft and Royal Navy ships (especially aircraft carriers), and paintings and drawings related to naval aviation. It is located on RNAS Yeovilton airfield, and the museum has viewing areas where visitors can watch military aircraft (especially helicopters) take off and land. At the entrance to the museum are anchors from and , fleet carriers which served the Royal Navy until the 1970s. It is located north of Yeovil, and south of Bristol. Exhibits The museum's main display is divided into four areas: Hall 1 This hall contains a display about the development of naval aviation from the early days of airships and fabric-covered wooden biplanes to modern jet aircraft and helicopters, including the front section of the fuselage of Short 184 ''8359'', built locally by Westland Aircraft in Yeovil and flown ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Aeroplane
''Aeroplane'' (formerly ''Aeroplane Monthly'') is a British magazine devoted to aviation, with a focus on aviation history and preservation. __TOC__ ''The Aeroplane'' The weekly ''The Aeroplane'' launched in June 1911 under founding editor C. G. Grey with Victor Sassoon. Grey remained editor until November 1939. ''Aeroplane Monthly'' Issue 1 of ''Aeroplane Monthly'' was published in May 1973 at a cover price of 30p, in association with ''Flight International'', by IPC Media. The founder was Richard T. Riding (1942-2019), whose father, E.J. Riding, had been photographer for ''The Aeroplane'' magazine of the 1940s. The magazine is now owned by Key Publishing Ltd and headquartered in Stamford, Lincolnshire. The magazine is the successor to an earlier, weekly publication called ''The Aeroplane'', founded in 1911. See also *''Flight International ''Flight International'' is a monthly magazine focused on aerospace. Published in the United Kingdom and founded in 1909 as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Napier Sabre
The Napier Sabre is a British H-24-cylinder, liquid-cooled, sleeve valve, piston aero engine, designed by Major Frank Halford and built by D. Napier & Son during World War II. The engine evolved to become one of the most powerful inline piston aircraft engines in the world, developing from in its earlier versions to in late-model prototypes. The first operational aircraft to be powered by the Sabre were the Hawker Typhoon and Hawker Tempest; the first aircraft powered by the Sabre was the Napier-Heston Racer, which was designed to capture the world speed record. Other aircraft using the Sabre were early prototype and production variants of the Blackburn Firebrand, the Martin-Baker MB 3 prototype and a Hawker Fury prototype. The rapid introduction of jet engines after the war led to the quick demise of the Sabre, as there was less need for high power military piston aero engines and because Napier turned its attention to developing turboprop engines such as the Naiad and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bristol Engine Company
The Bristol Aeroplane Company, originally the British and Colonial Aeroplane Company, was both one of the first and one of the most important British aviation companies, designing and manufacturing both airframes and aircraft engines. Notable aircraft produced by the company include the 'Boxkite', the Bristol Fighter, the Bulldog, the Blenheim, the Beaufighter, and the Britannia, and much of the preliminary work which led to Concorde was carried out by the company. In 1956 its major operations were split into Bristol Aircraft and Bristol Aero Engines. In 1959, Bristol Aircraft merged with several major British aircraft companies to form the British Aircraft Corporation (BAC) and Bristol Aero Engines merged with Armstrong Siddeley to form Bristol Siddeley. BAC went on to become a founding component of the nationalised British Aerospace, now BAE Systems. Bristol Siddeley was purchased by Rolls-Royce in 1966, who continued to develop and market Bristol-designed engines. The B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radial Engine
The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders "radiate" outward from a central crankcase like the spokes of a wheel. It resembles a stylized star when viewed from the front, and is called a "star engine" in some other languages. The radial configuration was commonly used for aircraft engines before gas turbine engines became predominant. Engine operation Since the axes of the cylinders are coplanar, the connecting rods cannot all be directly attached to the crankshaft unless mechanically complex forked connecting rods are used, none of which have been successful. Instead, the pistons are connected to the crankshaft with a master-and-articulating-rod assembly. One piston, the uppermost one in the animation, has a master rod with a direct attachment to the crankshaft. The remaining pistons pin their connecting rods' attachments to rings around the edge of the master rod. Extra "rows" of radial cylinders can be added i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bristol Perseus Sleeve Valve Radial Engine
Bristol () is a city, ceremonial county and unitary authority in England. Situated on the River Avon, it is bordered by the ceremonial counties of Gloucestershire to the north and Somerset to the south. Bristol is the most populous city in South West England. The wider Bristol Built-up Area is the eleventh most populous urban area in the United Kingdom. Iron Age hillforts and Roman villas were built near the confluence of the rivers Frome and Avon. Around the beginning of the 11th century, the settlement was known as (Old English: 'the place at the bridge'). Bristol received a royal charter in 1155 and was historically divided between Gloucestershire and Somerset until 1373 when it became a county corporate. From the 13th to the 18th century, Bristol was among the top three English cities, after London, in tax receipts. A major port, Bristol was a starting place for early voyages of exploration to the New World. On a ship out of Bristol in 1497, John Cabot, a Venetian, b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autocar (magazine)
''Autocar'' (originally ''The Autocar'') is a weekly British automobile magazine published by the Haymarket Media Group. It was first published in 1895 and refers to itself as "the world's oldest car magazine". There are now several international editions, including for China, India, New Zealand, and South Africa. History The publication was launched as ''The Autocar'' by Iliffe and Son Ltd. "in the interests of the mechanically propelled road carriage" on 2 November 1895 when, it is believed, there were only six or seven cars in the United Kingdom. L. J. K. Setright suggests that the magazine was set up by Henry Sturmey as an organ of propaganda for Harry J. Lawson, founder of the Daimler Company and a journalist on the magazine in its early days. Henry Sturmey stood down as editor of ''The Autocar'' magazine and left the company in 1901. ''Autocar'' claims to have invented the road test in 1928 when it analysed the Austin 7 Gordon England Sunshine Saloon. ''Aut ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sleeve Valve
The sleeve valve is a type of valve mechanism for piston engines, distinct from the usual poppet valve. Sleeve valve engines saw use in a number of pre-World War II luxury cars and in the United States in the Willys-Knight car and light truck. They subsequently fell from use due to advances in poppet-valve technology, including sodium cooling, and the Knight system double sleeve engine's tendency to burn a lot of lubricating oil or to seize due to lack of it. The Scottish Argyll company used its own, much simpler and more efficient, single sleeve system (Burt-McCollum) in its cars, a system which, after extensive development, saw substantial use in British aircraft engines of the 1940s, such as the Napier Sabre, Bristol Hercules, Centaurus, and the promising but never mass-produced Rolls-Royce Crecy, only to be supplanted by the jet engines. Description A sleeve valve takes the form of one or more machined sleeves. It fits between the piston and the cylinder wall in the cylin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oakum
Oakum is a preparation of tarred fibre used to seal gaps. Its main traditional applications were in shipbuilding, for caulking or packing the joints of timbers in wooden vessels and the deck planking of iron and steel ships; in plumbing, for sealing joints in cast iron pipe; and in log cabins for chinking. In ship caulking, it was forced into the seams using a hammer and a caulking iron, then sealed into place with hot pitch. It is also referenced frequently as a medical supply for medieval surgeons, often used along with bandages for sealing wounds. History The word oakum derives from Middle English ', from Old English ', from ' ( separative and perfective prefix) + ' (akin to Old English ', 'comb')—literally 'off-combings'. Oakum was at one time recycled from old tarry ropes and cordage, which were painstakingly unravelled and reduced to fibre, termed "picking". The task of picking and preparation was a common occupation in prisons and workhouses, where the young or th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
