1.
Donnet-Denhaut
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Donnet was a French manufacturing company of the early twentieth century. Founded as Donnet-Denhaut by Jérôme Donnet and François Denhaut at Neuilly-sur-Seine in 1914, the company became known simply as Donnet after designer Denhaut left it in 1919, but did not continue to build aircraft for long afterwards. Jérôme Donnet purchased Automobiles Zedel of Pontarlier, Doubs, France in 1919, from this factory he made the Donnet-Zedel CI-6 with 2120 cc engine, a design originating from 1912. A new car, the 1098 cc Type G was introduced in 1925 and it sold well, the Type G was made in a former Donnet aircraft factory at Gennevilliers, Seine. Most of the produced by Zédel, Donnet-Zédel and Donnet were powered by four-cylinder engines. The Zédel engine had a displacement of 3168 cc, and the Donnet-Zédel 1100 or 2120 cc, the Pontarlier works was sold in 1928 and the Zedel part of the name was dropped. An expanded range of cars appeared as production relocated to the Paris hub in the late 1920s, Donnet bought another factory at Nanterre, Seine from Vinot et Deguingand early in 1927. The factory although small had room for expansion, by the time of the 25th Paris Motor Show, in October 1931, substantial investment at Nanterre enabled the manufacturer to boast of having the most up to date automobile factory in France. The design used the existing Donnet 1970cc 6-cylinder engine, but this was matched to a well thought through fwd drive-train, the design used a 3,000 mm wheelbase and the projected price of 38,900 francs was quite moderate for so modern a car. The car was powered by a two-stroke 750cc engine that had originally designed by Marcel Violet. The little car had never sold in great volume by its previous manufacturer. By October 1933 it was missing from the Donnet stand at the 27th Paris Motor Show, although the range in the 1930s included six-cylinder models, new model investment was limited, the great days were over and production ended in 1934. The impressive modern factory at Nanterre was sold to SIMCA at the end of 1934, one of the best models was a Donnet with a 2540 cc six-cylinder side-valve engine. Janes All the Worlds Aircraft 1919, Company history at RitzSite Company logo Donnet advertisement More Donnet-Zedel information
2.
1915 in aviation
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This is a list of aviation-related events from 1915, The United States Navy establishes a lighter-than-air arm, charged with the operation of airships and of kite balloons to be towed behind warships. By the end of World War I on November 11,1918, four of its battleships, the United States Army forms one company of the 2d Aero Squadron for service in the Philippine Islands. January 6 or 15 – The German submarine U-12 departs Zeebrugge with a Friedrichshafen FF.29 seaplane lashed to her deck in an attempt to use submarines to carry seaplanes within range of England. The seaplane is forced to take off early, reconnoiters the coast of Kent and it is the only German attempt to operate an aircraft from a submarine. January 7 – Italy establishes the Corpo Aeronautica Militare as part of the Italian Royal Army, january 19–20 – The first Zeppelin raid on the United Kingdom takes place, carried out by the Imperial German Navy dirigibles L3, L-4, and L-6. L-6 turns back with engine trouble, but L-3 drops six 50-kg high-explosive and seven incendiary bombs on Great Yarmouth and L-4 bombs Sheringham, Snettisham, the raid kills four people and injures 16. Two Imperial Russian Navy minesweepers capture her seven-man crew and set her ablaze, No further airship operations will take place in the Baltic theater until mid-July. February 2 – The only Imperial Russian Navy seaplane carrier to see service in the Baltic Sea during World War I, february 15 – Russian Sikorsky Ilya Muromets bombers attack the Vistula-Dobrzhani area of Poland, the first bombing raid by the Ilya Muromets. L-3s crew burns her before being interned by Danish authorities, L-4 is blown out over the North Sea after touching down in Denmark and disappears with four men still on board, the Danes intern the rest of her crew. The Imperial Russian Navys Black Sea Fleet begins seaplane carrier raids against the Bosporus, NACA will operate until October 1,1958, when the National Aeronautics and Space Administration will replace it. March 7 – The first British tactical bombing raids are made in support of troops in Menin. March 11 – The Royal Navy charters the cargo ship SS Manica for conversion into the first British balloon ship, the Royal Navy will be the only navy during World War I to operate balloon ships, specialized ships designed to handle observation balloons as their sole function. March 14 – Pioneering American pilot Lincoln J. March 17 – The Imperial German Army attempts its first airship raid against the United Kingdom with the Zeppelin Z XII, the German Navy later also experiments with such cars and later makes them standard equipment aboard German naval airships. When his grapnel mechanism jams as he unreels it, he instead downs the Albatros by ramming it with his undercarriage. March 24 – Five Royal Naval Air Service Avro 504s of No.1 Squadron bomb the German submarine depot at Hoboken in Antwerp, Belgium, starting a fire in the shipyard that destroys two German submarines. April 1 In a Morane-Saulnier L, future French ace Jean Navarre and his observer/gunner, Sub-Lieutenant Jean Robert, attack a German Aviatik B. I over Merval, Robert uses a carbine to damage it and wound its pilot, forcing it to land behind French lines and surrender. Later in the day, French pilot Lieutenant Roland Garros scores the first kill achieved by firing a gun through a tractor propeller when he shoots down a German Albatros observation plane. It is also his first kill and he will score two more victories this way, on April 15 and April 18
3.
French Navy
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The French Navy, informally La Royale, is the maritime arm of the French Armed Forces. As of June 2014, the French Navy employed a total of 36,776 personnel, the reserve element of the French Navy consisted of 4,827 personnel of the Operational Reserve. The French naval fleet includes more than a hundred vessels and nuclear type submarines, the history of the French Navy dates back to the History of the French Navy of Antiquity to the Renaissance, part of the History of the French Navy. The French Royal Navy was quasi inexistent prior 1624, the Ordre de Saint-Jean de Jérusalem, which was both a religious and military order, had its own respective international war fleet which assured the policing of the seas in the Mediterranean. The members which had satisfied obligations for periods in service at sea fulfilling their service, were granted the rank of Knights Hospitaller, however, many considered the naval service formation to integrate later, while being well formed, their respective navy. The Ordre de Saint-Jean de Jérusalem was one of the ancestors of the French naval schools and in principal, the Order accordingly formed most of the ships Captains, Officers of the French Royal Navy and Admirals of the Marine française de guerre de la Méditerranée. During the Revolution, the French Navy succeeded to the French Royal Navy, under the First French Empire and the Second French Empire, the navy was designated as the Imperial French Navy. The French Navy is still designated today familiarly as La Royale and this expression was used by commercial sailors due to their military service at the corps of the navy by the institution of maritime inscription. The implementation then of the Ministère de la Marine later the de la Marine de guerre française at rue Royale. The symbol of the French Navy, which was since origin a golden anchor » and this symbol featured on all naval vessels, the arms, uniforms, the couriers, equipment, and general arms of the navy. This symbol was replaced in 1990 by a logo featuring a bow section of a warship with two ascending red and blue spray foams, and the inscription Marine nationale. The Chief of Staff of the French Navy was Admiral Bernard Louzeau, the navy became a consistent instrument of national power around the seventeenth century with Richelieus efforts under Louis XIII, and Colberts under Louis XIV. Under the tutelage of the Sun King, the French Navy was well-financed and -equipped, managing to score several victories in the Nine Years War against the Royal Navy. Financial troubles, however, forced the navy back to port and allowed the English, before the Nine Years War, in the Franco-Dutch War, it managed to score a decisive victory over a combined Spanish-Dutch fleet at the Battle of Palermo. The French Navy scored various successes, as in the campaigns led in the Atlantic by Picquet de la Motte, in 1766, Bougainville led the first French circumnavigation. During the American Revolutionary War the French Navy played a role in supporting the Americans. French warships participated in the battle by bombarding British ground forces, in India, Suffren waged campaigns against the British, successfully contending for supremacy against Vice-Admiral Sir Edward Hughes. In the Mediterranean, the French Navy waged a campaign during a 1798 French invasion of Egypt
4.
United States Navy
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The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U. S. Navy is the largest, most capable navy in the world, the U. S. Navy has the worlds largest aircraft carrier fleet, with ten in service, two in the reserve fleet, and three new carriers under construction. The service has 323,792 personnel on duty and 108,515 in the Navy Reserve. It has 274 deployable combat vessels and more than 3,700 operational aircraft as of October 2016, the U. S. Navy traces its origins to the Continental Navy, which was established during the American Revolutionary War and was effectively disbanded as a separate entity shortly thereafter. It played a role in the American Civil War by blockading the Confederacy. It played the role in the World War II defeat of Imperial Japan. The 21st century U. S. Navy maintains a global presence, deploying in strength in such areas as the Western Pacific, the Mediterranean. The Navy is administratively managed by the Department of the Navy, the Department of the Navy is itself a division of the Department of Defense, which is headed by the Secretary of Defense. The Chief of Naval Operations is an admiral and the senior naval officer of the Department of the Navy. The CNO may not be the highest ranking officer in the armed forces if the Chairman or the Vice Chairman of the Joint Chiefs of Staff. The mission of the Navy is to maintain, train and equip combat-ready Naval forces capable of winning wars, deterring aggression, the United States Navy is a seaborne branch of the military of the United States. The Navys three primary areas of responsibility, The preparation of naval forces necessary for the prosecution of war. The development of aircraft, weapons, tactics, technique, organization, U. S. Navy training manuals state that the mission of the U. S. Armed Forces is to prepare and conduct prompt and sustained combat operations in support of the national interest, as part of that establishment, the U. S. Navys functions comprise sea control, power projection and nuclear deterrence, in addition to sealift duties. It follows then as certain as that night succeeds the day, that without a decisive naval force we can do nothing definitive, the Navy was rooted in the colonial seafaring tradition, which produced a large community of sailors, captains, and shipbuilders. In the early stages of the American Revolutionary War, Massachusetts had its own Massachusetts Naval Militia, the establishment of a national navy was an issue of debate among the members of the Second Continental Congress. Supporters argued that a navy would protect shipping, defend the coast, detractors countered that challenging the British Royal Navy, then the worlds preeminent naval power, was a foolish undertaking. Commander in Chief George Washington resolved the debate when he commissioned the ocean-going schooner USS Hannah to interdict British merchant ships, and reported the captures to the Congress
5.
Portuguese Navy
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The Portuguese Navy, tracing back to the 12th century, is one of the oldest continuously serving navies in the world. The navy played a key role at the beginning and during the voyages of the Age of Discoveries in the 15th and 16th centuries. Bartolomeu Dias rounded the tip of Africa and Vasco da Gama reached India, linking Europe and Asia for the first time by ocean route, as well as the Atlantic. The Portuguese Navy also participates in missions related with international commitments assumed by Portugal, the first known battle of the Portuguese Navy happened in 1180, during the reign of Portugals first king, Afonso I. The battle occurred when a Portuguese fleet commanded by the knight Fuas Roupinho defeated a Muslim fleet near Cape Espichel, Fuas Roupinho also made two incursions at Ceuta, in 1181 and 1182, and died during the latter of these attempts to conquer the North African city. During the 13th century, in the Portuguese Reconquista, the Navy helped in the conquest of several coastal Moorish towns, like Alcácer do Sal, Silves and Faro. It was also used in the battles against Castile through incursions in Galicia and Andalusia, in 1317, King Denis decided to give, for the first time, a permanent organization to the Royal Navy, appointed Manuel Pessanha of Genoa to be the first Admiral of the Kingdom. In 1321, the Navy successfully attacked Muslim ports in North Africa, Maritime insurance began in 1323 in Portugal, and between 1336 and 1341 the first attempts at maritime expansion are made, with the expedition to Canary Islands, sponsored by King Afonso IV. In the context of the 1383–85 Crisis, the Portuguese Navy took a participation in the war against Castile. In July 1384, the Portuguese Navy was able to break the Castilian siege of Lisbon and to supply the city, defeating the Castilian Navy in the naval battle of the Tagus. At the end of the 14th century, more Portuguese discoveries were made, with the Navy playing a role in the exploration of the oceans. Portugal became the first naval world power, in the beginning of the 15th century, the country entered a period of peace and stability. Europe was still involved in wars and feudal conflicts which allowed Portugal to be the only country to methodically and successfully start the exploration of the Atlantic. Exploration in the west African coast started in 1412 and ended with the crossing of the Cape of Good Hope in 1488, after his return from Ceuta, Henry the navigator founded a school of navigation in Sagres, which was a place to discuss the art of navigation. The vessel employed in the beginning of the Discoveries was the caravel, the first results came soon and Gonçalves Zarco discovers the Porto Santo Island in 1419 and the Madeira Island in 1420, Diogo de Silves discovers the azorean island of Santa Maria in 1427. In 1424, Gil Eanes crosses the Cape Bojador, Diogo Cão and Bartolomeu Dias arrived to the mouth of the Zaire River in 1482. In the same year, the São Jorge da Mina castle is built in the coast of Western Africa, by Diogo de Azambuja, in 1488, Bartolomeu Dias becomes the first European to sail around the southernmost tip of Africa, the Cape of Good Hope. João Vaz Corte-Real arrives to Newfoundland in 1473, part of the coast of Newfoundland would be charted by the Corte-Real brothers, sons of João Vaz Corte-Real, in a failed attempt to find the Northwest Passage in 1501
6.
France
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France, officially the French Republic, is a country with territory in western Europe and several overseas regions and territories. The European, or metropolitan, area of France extends from the Mediterranean Sea to the English Channel and the North Sea, Overseas France include French Guiana on the South American continent and several island territories in the Atlantic, Pacific and Indian oceans. France spans 643,801 square kilometres and had a population of almost 67 million people as of January 2017. It is a unitary republic with the capital in Paris. Other major urban centres include Marseille, Lyon, Lille, Nice, Toulouse, during the Iron Age, what is now metropolitan France was inhabited by the Gauls, a Celtic people. The area was annexed in 51 BC by Rome, which held Gaul until 486, France emerged as a major European power in the Late Middle Ages, with its victory in the Hundred Years War strengthening state-building and political centralisation. During the Renaissance, French culture flourished and a colonial empire was established. The 16th century was dominated by civil wars between Catholics and Protestants. France became Europes dominant cultural, political, and military power under Louis XIV, in the 19th century Napoleon took power and established the First French Empire, whose subsequent Napoleonic Wars shaped the course of continental Europe. Following the collapse of the Empire, France endured a succession of governments culminating with the establishment of the French Third Republic in 1870. Following liberation in 1944, a Fourth Republic was established and later dissolved in the course of the Algerian War, the Fifth Republic, led by Charles de Gaulle, was formed in 1958 and remains to this day. Algeria and nearly all the colonies became independent in the 1960s with minimal controversy and typically retained close economic. France has long been a centre of art, science. It hosts Europes fourth-largest number of cultural UNESCO World Heritage Sites and receives around 83 million foreign tourists annually, France is a developed country with the worlds sixth-largest economy by nominal GDP and ninth-largest by purchasing power parity. In terms of household wealth, it ranks fourth in the world. France performs well in international rankings of education, health care, life expectancy, France remains a great power in the world, being one of the five permanent members of the United Nations Security Council with the power to veto and an official nuclear-weapon state. It is a member state of the European Union and the Eurozone. It is also a member of the Group of 7, North Atlantic Treaty Organization, Organisation for Economic Co-operation and Development, the World Trade Organization, originally applied to the whole Frankish Empire, the name France comes from the Latin Francia, or country of the Franks
7.
World War I
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World War I, also known as the First World War, the Great War, or the War to End All Wars, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918. More than 70 million military personnel, including 60 million Europeans, were mobilised in one of the largest wars in history and it was one of the deadliest conflicts in history, and paved the way for major political changes, including revolutions in many of the nations involved. The war drew in all the worlds great powers, assembled in two opposing alliances, the Allies versus the Central Powers of Germany and Austria-Hungary. These alliances were reorganised and expanded as more nations entered the war, Italy, Japan, the trigger for the war was the assassination of Archduke Franz Ferdinand of Austria, heir to the throne of Austria-Hungary, by Yugoslav nationalist Gavrilo Princip in Sarajevo on 28 June 1914. This set off a crisis when Austria-Hungary delivered an ultimatum to the Kingdom of Serbia. Within weeks, the powers were at war and the conflict soon spread around the world. On 25 July Russia began mobilisation and on 28 July, the Austro-Hungarians declared war on Serbia, Germany presented an ultimatum to Russia to demobilise, and when this was refused, declared war on Russia on 1 August. Germany then invaded neutral Belgium and Luxembourg before moving towards France, after the German march on Paris was halted, what became known as the Western Front settled into a battle of attrition, with a trench line that changed little until 1917. On the Eastern Front, the Russian army was successful against the Austro-Hungarians, in November 1914, the Ottoman Empire joined the Central Powers, opening fronts in the Caucasus, Mesopotamia and the Sinai. In 1915, Italy joined the Allies and Bulgaria joined the Central Powers, Romania joined the Allies in 1916, after a stunning German offensive along the Western Front in the spring of 1918, the Allies rallied and drove back the Germans in a series of successful offensives. By the end of the war or soon after, the German Empire, Russian Empire, Austro-Hungarian Empire, national borders were redrawn, with several independent nations restored or created, and Germanys colonies were parceled out among the victors. During the Paris Peace Conference of 1919, the Big Four imposed their terms in a series of treaties, the League of Nations was formed with the aim of preventing any repetition of such a conflict. This effort failed, and economic depression, renewed nationalism, weakened successor states, and feelings of humiliation eventually contributed to World War II. From the time of its start until the approach of World War II, at the time, it was also sometimes called the war to end war or the war to end all wars due to its then-unparalleled scale and devastation. In Canada, Macleans magazine in October 1914 wrote, Some wars name themselves, during the interwar period, the war was most often called the World War and the Great War in English-speaking countries. Will become the first world war in the sense of the word. These began in 1815, with the Holy Alliance between Prussia, Russia, and Austria, when Germany was united in 1871, Prussia became part of the new German nation. Soon after, in October 1873, German Chancellor Otto von Bismarck negotiated the League of the Three Emperors between the monarchs of Austria-Hungary, Russia and Germany
8.
Biplane
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A biplane is a fixed-wing aircraft with two main wings stacked one above the other. The first powered, controlled aeroplane to fly, the Wright Flyer, used a biplane wing arrangement, while a biplane wing structure has a structural advantage over a monoplane, it produces more drag than a similar unbraced or cantilever monoplane wing. Improved structural techniques, better materials and the quest for greater speed made the biplane configuration obsolete for most purposes by the late 1930s. Biplanes offer several advantages over conventional cantilever monoplane designs, they permit lighter wing structures, low wing loading, however, interference between the airflow over each wing increases drag substantially, and biplanes generally need extensive bracing, which causes additional drag. Biplanes are distinguished from tandem wing arrangements, where the wings are placed forward and aft, instead of above, the term is also occasionally used in biology, to describe the wings of some flying animals. In a biplane aircraft, two wings are placed one above the other, either or both of the main wings can support ailerons, while flaps are more usually positioned on the lower wing. Bracing is nearly always added between the upper and lower wings, in the form of wires and/or slender interplane struts positioned symmetrically on either side of the fuselage. The primary advantage of the biplane over the traditional single plane or monoplane is to combine great stiffness with light weight. A braced monoplane wing must support itself fully, while the two wings of a help to stiffen each other. The biplane is therefore inherently stiffer than the monoplane, also, the structural forces in the spars of a biplane wing tend to be lower, so the wing can use less material to obtain the same overall strength and is therefore much lighter. A disadvantage of the biplane was the need for extra struts to space the wings apart, the low power supplied by the engines available in the first years of aviation meant that aeroplanes could only fly slowly. This required an even lower stalling speed, which in turn required a low wing loading, combining both large wing area with light weight. A biplane wing of a span and chord has twice the area of a monoplane the same size and so can fly more slowly. Alternatively, a wing of the same area as a monoplane has lower span and chord, reducing the structural forces. Biplanes suffer aerodynamic interference between the two planes and this means that a biplane does not in practice obtain twice the lift of the similarly-sized monoplane. The farther apart the wings are spaced the less the interference, given the slow speed and low power of early aircraft, the drag penalty of the wires and struts and the mutual interference of airflows were relatively minor and acceptable factors. The smaller biplane wing also allows greater maneuverability, during World War One, this further enhanced the dominance of the biplane and, despite the need for speed, military aircraft were among the last to abandon the biplane form. Specialist sports Aerobatic biplanes are still occasionally made, biplanes were originally designed with the wings positioned directly one above the other
9.
Flying boat
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A flying boat is a fixed-winged seaplane with a hull, allowing it to land on water, that usually has no type of landing gear to allow operation on land. It differs from a floatplane as it uses a purpose-designed fuselage which can float, Flying boats may be stabilized by under-wing floats or by wing-like projections from the fuselage. Flying boats were some of the largest aircraft of the first half of the 20th century and their advantage lay in using water instead of expensive land-based runways, making them the basis for international airlines in the interwar period. They were also used for maritime patrol and air-sea rescue. Their use gradually trailed off after World War II, partially because of the investments in airports during the war. In the 21st century, flying boats maintain a few uses, such as dropping water on forest fires, air transport around archipelagos. Many modern seaplane variants, whether float or flying boat types, are convertible amphibious aircraft where either landing gear or flotation modes may be used to land, on 6 June 1905 Gabriel Voisin took off and landed on the River Seine with a towed kite glider on floats. The first of his flights was 150 yards. He later built a powered floatplane in partnership with Louis Blériot, other pioneers also attempted to attach floats to aircraft in Britain, Australia, France and the USA. On 28 March 1910 Frenchman Henri Fabre successfully flew the first successful powered seaplane, the Gnome Omega-powered hydravion, fabres first successful take off and landing by a powered seaplane inspired other aviators and he designed floats for several other flyers. The first hydro-aeroplane competition was held in Monaco in March 1912, featuring aircraft using floats from Fabre, Curtiss, Tellier and this led to the first scheduled seaplane passenger services at Aix-les-Bains, using a five-seat Sanchez-Besa from 1 August 1912. The French Navy ordered its first floatplane in 1912, in 1911-12 François Denhaut constructed the first seaplane with a fuselage forming a hull, using various designs to give hydrodynamic lift at take-off. Its first successful flight was on 13 April 1912, throughout 1910 and 1911 American pioneering aviator Glenn Curtiss developed his floatplane into the successful Curtiss Model D land-plane, which used a larger central float and sponsons. Combining floats with wheels, he made the first amphibian flights in February 1911 and was awarded the first Collier Trophy for US flight achievement, from 1912 his experiments with a hulled seaplane resulted in the 1913 Model E and Model F, which he called flying-boats. In February 1911 the United States Navy took delivery of the Curtiss Model E, in Britain, Captain Edward Wakefield and Oscar Gnosspelius began to explore the feasibility of flight from water in 1908. They decided to use of Lake Windermere in the Lake District. Meanwhile, Wakefield ordered a similar to the design of the 1910 Fabre Hydravion. By November 1911, both Gnosspelier and Wakefield had aircraft capable of flight from water and awaited suitable weather conditions, gnosspeliers flight was short-lived as the aircraft crashed into the lake
10.
Rotary engine
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Its main application was in aviation, although it also saw use before its primary aviation role, in a few early motorcycles and automobiles. This type of engine was used as an alternative to conventional inline engines during World War I. It has been described as an efficient solution to the problems of power output, weight. The rotating mass of the engine also caused significant gyroscopic precession, depending on the type of aircraft, in the most common form, the crankshaft was fixed solidly to the airframe, and the propeller was simply bolted to the front of the crankcase. Improved cooling, when the engine was running the rotating crankcase/cylinder assembly created its own fast-moving cooling airflow, weight advantage, many conventional engines had to have heavy flywheels added to smooth out power impulses and reduce vibration. Rotary engines gained a substantial power-to-weight ratio advantage by having no need for an added flywheel, like radial engines, rotaries were generally built with an odd number of cylinders, so that a consistent every-other-piston firing order could be maintained, to provide smooth running. Rotary engines with an number of cylinders were mostly of the two row type. Rotary and radial engines look strikingly similar when they are not running and can easily be confused, unlike the rotary engine, however, radial engines use a conventional rotating crankshaft in a fixed engine block. The Musee de lAir in Paris has on display a special and it alternates between rotary and radial modes to demonstrate the difference between the internal motions of the two types of engine. It is often asserted that rotary engines had no carburetor and hence power could only be reduced by cutting the ignition using a blip switch. This was almost literally true of the Monosoupape type, which took most of the air into the cylinder through the exhaust valve, thus the richness of the mixture in the cylinder could not be controlled via the crankcase intake. The throttle of a monosoupape provided only a limited degree of speed regulation, as opening it made the mixture too rich. Early models featured a form of variable valve timing in an attempt to give greater control. Most rotaries however, had normal inlet valves, so that the fuel was taken into the already mixed with air - as in a normal four-stroke engine. The pilot needed to set the throttle to the desired setting, after starting the engine with a known setting that allowed it to idle, the air valve was opened until maximum engine speed was obtained. Throttling a running back to reduce revs was possible by closing off the fuel valve to the required position while re-adjusting the fuel/air mixture to suit. This process was also tricky, so that throttling back, especially when landing, was accomplished by intermittently cutting the ignition using the blip switch. Cutting cylinders using ignition switches had the drawback of letting fuel continue to pass through the engine, oiling up the spark plugs, also, the raw oil-fuel mix could collect in the cowling
