Principal Structural Units of the Airplane Essays

Principal Structural Units of the Airplane Essays Principal Structural Units of the Airplane Essay Principal Structural Units of the Airplane Essay Dialogue T. Well consider the principal structural units of the airplane. Look at the picture (Fig. 1. 1). This is an airplane. [pic] Figure 1. 1 T. Do you know the meaning of the word airplane ? S. Yes, I do. It is Ð »Ã'â€"Ã'‚Ð °Ã º. T. You are right. There are some words in the English language which have the same meaning. They are aircraft, airliner and aeroplane, plane, for short. S. What does the airplane consist of? T. The airplane consists of five principal structural units: the fuselage, the wing, the tail unit, the landing gear and the power plant. The wing means kphjio. It is the main plane of the aircraft. The word plane has two meanings Ð »Ã'â€"Ã'‚Ð °Ã º Ã'‚a Ð ¿Ã »Ã ¾Ã'‰Ð ¸Ã ½Ã °. S. What is the function of the wing? T. The function of the wing is to support an airplane in the air and to create lift. S. What is the function of the fuselage? T. The function of the fuselage is to carry passengers, crew, cargo, equipment and to support the wing, tail unit and engines in some designs. It also carries the landing gear. S. What is the meaning of the word crew. T. It is Ð µÃ ºÃ'â€"Ð ¿Ã °Ã ¶. Cargo means Ð ²Ã °Ã ½Ã'‚Ð °Ã ¶. The Ukrainian for tail unit is Ã'…Ð ²Ã ¾Ã' Ã'‚Ð ¾Ã ²Ã ° Ã'‡Ð °Ã' Ã'‚Ð ¸Ã ½Ã °. There are some synonyms to it. They are: the tail assembly, tail, empennage, fin assembly. The word engine means Ð ´Ã ²Ã ¸Ã ³Ã'Æ'Ð ½. The landing gear is Ã'ˆÐ °Ã' Ã'â€". S. What is the function of the tail unit? T. The function of the tail unit is to provide directional stability and control of the airplane in flight. S. What is the function of the power plant? T. The power plant is a source of power. S. What is the function of the landing gear? T. The landing gear supports the airplane on the ground and its function is also to absorb shocks of landing. I am sure you know the meaning of the word land and landing means Ð ¿Ã ¾Ã' Ã °Ã ´Ã ºÃ °. Exercise 1. Read and translate text 1. Text 1. Principal Structural Units of the Airplane The airplane consists of five principal structural units: the fuselage, the wing, the tail unit, the landing gear and the power plant. The fuselage extends from the nose to the tail of the airplane. It houses passengers, crew, cargo and equipment. It supports the wing, tail unit and sometimes engines. The fuselage also carries the landing gear. The wings are lifting and supporting surfaces of the airplane in flight. The function of the wing is to support the airplane in the air and to create lift. The function of the tail unit is to provide directional stability and control of the airplane in flight. The tail unit consists of two surfaces, vertical and horizontal. The function of the power plant is to provide power for flight and to propel the airplane. The landing gear supports the airplane on the ground and its function is to taxi the aircraft on the ground and to absorb the energy of landing. Exercise 2. Translate word combinations with the term aircraft: civil aircraft, cargo aircraft, military aircraft, passenger aircraft, ambulance aircraft, commercial aircraft, sea aircraft, cargo-passenger aircraft, long-range aircraft, forest patrol aircraft, mail-carrying aircraft, search and rescue aircraft. Exercise 3. Translate noun + noun word-combinations: aircraft engine, air flow, design principles, fuel tank, shock absorber, control unit, air pressure, fuselage skin, oil system, rocket engine, helicopter rotor, airplane speed, engine operation, flight condition. Exercise 4 Match the synonyms, aircraftspeed wingsource of power tail unitundercarriage landing gearmain plane power plantempennage fuselageairplane velocitycentral body Exercise 5. Translate verb-combinations. to consist of structural units, to extend from the nose to the tail, to support the wing, to carry cargo, to create lift, to provide directional stability, to control the airplane in flight, to propel the aircraft, to absorb the energy of landing, to taxi on the ground. Exercise 6. Make the following sentences interrogative and negative. 1. The fuselage is the central body of the airplane. 2. We divide the aeroplane into five principal structural units. 3. The power plant provides power for flight. 4. The tail unit consists of two surfaces, vertical and horizontal. 5. The wing extends equally on each side of the fuselage. Exercise 7. Say if the following statements are true or false. If they are wrong, correct them. 1. The airplane consists of two principal structural units. 2. The tail unit supports the wing. 3. The function of the power plant is to create lift. 4. The wings are not lifting and supporting surfaces of the airplane in flight. 5. The fuselage controls the airplane in flight. Exercise 8. Answer the questions. 1. What units does the airplane consist of? 2. What does the fuselage carry? 3. What supports the tail unit? 4. What provides directional stability of the airplane in flight? 5. What propels the airplane? Exercise 9. Read and translate text 2. Text 2. Airplane Structure The airplane, engine-driven vehicle can fly through the air-supported by the action of the air against its wings. Airplanes are heavier than air. Airplanes generally share the same basic configuration each usually has a fuselage, wing, tail, power plant, landing gear, and a set of specialized control surfaces mounted on the wing and tail. The fuselage is the main cabin, or body of the airplane. Generally the fuselage has a cockpit section at the front end, where the pilot controls the airplane, and a cabin section. The cabin section may be designed to carry passengers, cargo, or both. In a military fighter plane, the fuselage may house the engines, fuel, electronics, and some weapons. All airplanes, by definition, have wings. Some are nearly all wings with a very small cockpit. Others have minimal wings or wings that seem to be merely extensions of a blended, aerodynamic fuselage such as the space shuttle. Most airplanes, except for flying wings, have a tail assembly attached to the rear of the fuselage, consisting of vertical and horizontal stabilizers, which look like small wings; a rudder, and elevators. The components of the tail assembly are referred to as the empennage. All airplanes must have some type of landing gear. Modern aircraft employ brakes, wheels, and tires designed specifically for the demands of flight. Exercise 10. Give definition to the following terms. aircraft, fuselage, wing, empennage, landing gear, power plant. Exercise 11. Speak on: 1. Aircraft structure. 2. Functions of aircraft structural units. Exercise 12. Translate text 3 in writing. Text 3. Aircraft Performance The aircraft performance includes dimensional data and the main flying characteristics. Dimensional data are length, wing span, height and width. The main flying characteristics are maximum take-off weight, maximum landing and payload weight, passenger capacity or number of seats, number of crew, cargo capacity, cruising speed, flight range, flight altitude, non-stop flying time, practical ceiling or service ceiling, engine type and thrust of each engine, number of engines, take-off and landing ground run, maximum fuel capacity, etc. The aircraft usually takes the name of the designer or manufacturer. Here are some of the aircraft designers: Antonov, Ilushin, Tupolev, Yakovlev. Manufacturers names are represented by: Boeing, Bristol, Canadair, Convair, Douglas, Lockheed, Vickers and others. Following the name of the designer or manufacturer comes a type code, known in some airlines as a class. For example: Antonov-70 (designers name and type code), Douglas DC-6B (manufacturers name and type code),etc. The aircraft can be supplied in some versions: Economy-Class Business-Class and First-Class. Exercise 13. Copy out aviation terms from text 3. Exercise 14. Answer the questions. 1. What dimensional data does the aircraft performance include? 2. What are the main flying characteristics? 3 The aircraft usually takes the name of the designer, doesnt it? 4. What is the type code? 5. What versions can an aircraft be supplied in? Exercise 15. Speak on Aircraft performance. Exercise 16. Remember aircraft performance data. 777-200 First flight: June 12,1994 Model number: 777-200 Classification: Commercial transport Span: 199 feet 11 inches Length: 209 feet 1 inch Gross weight: 506,000 pounds Cruising speed: 615 mph Range: 4,210 to 8, 270 miles Ceiling: 37, 900 feet Power: Two 74, 500-/77,200-pound-thrust PW 4074/4077 engines, two 74,500-/76,400-pound-thrust GE 90-75B/76B engines, or two 74,600-/76,900-pound-thrust RR Trent 875/877 engines Accommodation: 305 to 440 passengers AN-124IL- 86 Cargo cabin dimensions:Length: 59,5 m Length: 36mWing span: 48 m No. of engines: 4 Cruising speed: 850-900 km/hr Altitude: 10-11 km Range: 3,000 5,000 km No. f seats: 350 Width: 6. 4 m Height: 4. 4 m Maximum take-off weight: 405,000kg Maximum cargo capacity: 150,000kg Engine type and power: D-l 8T 4230 /423,400kg Cruising speed: 800-850 km/hr Flight altitude: 10,000 12,000 m Flight range with maximum cargo: 4,500 km Maximum flight range: 16,500 km DarkStar UAV First flight. March 29, 1996 Classification: Experimental unmanned aerial vehicle Span: 69 feet Length: 15 feet Range: 500 nautical miles Ceiling: Grea ter than 45,000 feet Power: Single turbofan engine Accommodation: Unmanned

Bimetallism Definition and Historical Perspective

Bimetallism Definition and Historical Perspective Bimetallism  is a monetary policy wherein the value of a currency is linked to the value of two metals, usually (but not necessarily) silver and gold. In this system, the value of the two metals would be linked to each other- in other words, the value of silver would be expressed in terms of gold, and  vice versa- and either metal could be used as legal tender.   Paper money  would then be directly convertible to an equivalent amount of either metal- for example, U.S. currency used to explicitly state that the bill was redeemable â€Å"in gold coin payable to the bearer on demand.† Dollars were literally receipts for a quantity of actual metal held by the government, a holdover from the time before paper money was common and standardized. History of Bimetallism From 1792, when the  U.S. Mint was established, until 1900, the United States was a bimetal country, with both silver and gold recognized as legal currency; in fact, you could bring silver or gold to a U.S. mint and have it converted into coins. The U.S. fixed the value of silver to gold as 15:1 (1 ounce of gold was worth 15 ounces of silver; this was later adjusted to 16:1). One problem with  bimetallism  occurs when the face value of a coin is lower than the actual value of the metal it contains. A one-dollar silver coin, for example, might be worth $1.50 on the silver market. These value disparities resulted in a severe silver shortage as people stopped spending silver coins and opted instead to sell them or have them melted down into bullion. In 1853, this shortage of silver prompted the U.S. government to debase its silver coinage- in other words, lowering the amount of silver in the coins. This resulted in more silver coins in circulation. While this stabilized the economy, it also moved the country towards  monometallism  (the use of a single metal in currency)  and the  Gold Standard. Silver was no longer seen as an attractive currency because the coins were not worth their face value. Then, during the  Civil War, hoarding of both gold and silver prompted the United States to temporarily switch to what’s known as â€Å"fiat money.† Fiat money, which is what we use today, is money that the government declares to be legal tender, but thats not backed or convertible to a physical resource like metal.  At this time, the government stopped redeeming paper money for gold or silver. The Debate After the war, the  Coinage Act of 1873  resurrected  the ability to exchange currency for gold- but it eliminated the ability to have silver bullion struck into coins, effectively making the U.S. a Gold Standard country. Supporters of the move (and the Gold Standard) saw stability; instead of having two metals whose value was theoretically linked, but which  in fact fluctuated because foreign countries often valued gold and silver differently than we did, we would have money based on a single metal that the U.S. had plenty of, allowing it to manipulate its market value and keep prices stable. This was controversial for some time, with many arguing that a â€Å"monometal† system limited the amount of money in circulation, making it difficult to obtain loans and deflating prices. This was widely seen by many as benefiting the banks and the rich while hurting farmers and common people, and the solution was seen to be a return to â€Å"free silver†- the ability to convert silver into coins, and true bimetallism. A Depression and a  panic in 1893  crippled the U.S. economy and exacerbated the argument over bimetallism, which came to be seen by some as the solution to all of the United States’ economic troubles. The drama peaked  during the  1896 presidential election. At the National Democratic Convention, eventual nominee  William Jennings Bryan  made his famous  Ã¢â‚¬Å"Cross of Gold†Ã‚  speech  arguing for bimetallism. Its success gained him the nomination, but Bryan lost the election to  William McKinley- in part because scientific advances coupled with new sources promised to increase the supply of gold, thus alleviating fears of limited money supplies. The Gold Standard In 1900, President McKinley signed the  Gold Standard Act, which officially made the United States a monometal country, making gold the only metal you could convert paper money into. Silver had lost, and bimetallism was a dead issue in the U.S. The gold standard persisted until 1933, when the  Great Depression  caused people to hoard their gold, thus making the system unstable; President Franklin Delano Roosevelt  ordered all gold and gold certificates to be sold to the government at a fixed price, then Congress changed the laws that required settlement of private and public debts with gold, essentially ending the gold standard here. The currency remained pegged to gold until 1971, when the â€Å"Nixon Shock† made then U.S. currency fiat money once again- as it has remained since.