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Aerobatics (a portmanteau of ''aerial-acrobatics'') is the practice of flying maneuvers involving aircraft attitudes that are not used in normal flight.〔 〕 Aerobatics are performed in airplanes and gliders for training, recreation, entertainment, and sport. Additionally, some helicopters, such as the MBB Bo 105, are capable of limited aerobatic maneuvers. An example of a fully aerobatic helicopter, capable of performing loops and rolls, is the Westland Lynx. The term is sometimes referred to as ''acrobatics'', especially when translated. Most aerobatic maneuvers involve rotation of the aircraft about its longitudinal (roll) axis or lateral (pitch) axis. Other maneuvers, such as a spin, displace the aircraft about its vertical (yaw) axis. Maneuvers are often combined to form a complete aerobatic sequence for entertainment or competition. Aerobatic flying requires a broader set of piloting skills and exposes the aircraft to greater structural stress than for normal flight. In some countries, the pilot must wear a parachute when performing aerobatics. Aerobatic training enhances a pilot's ability to recover from unusual flight conditions, and thus is an element of many flight safety training programs for pilots. While many pilots fly aerobatics for recreation, some choose to fly in aerobatic competitions, a refereed sport. ==Overview== In the early days of flying, some pilots used their aircraft as part of a flying circus to entertain. Among the earliest innovators in aerobatics the Frenchman Euclid's name is foremost. Maneuvers were flown for artistic reasons or to draw gasps from onlookers. In due course some of these maneuvers were found to allow aircraft to gain tactical advantage during aerial combat or dogfights between fighter aircraft. Aerobatic aircraft fall into two categories—specialist aerobatic, and aerobatic capable. Specialist designs such as the Pitts Special, the Extra 200 and 300, and the Sukhoi Su-26M and Sukhoi Su-29 aim for ultimate aerobatic performance. This comes at the expense of general purpose use such as touring, or ease of non aerobatic handling such as landing. At a more basic level, ''aerobatic capable'' aircraft, such as the Cessna 152 Aerobat or the R2160 Acrobin, can be dual purpose—equipped to carrying passengers and luggage, as well as being capable of basic aerobatic figures. ''Flight formation aerobatics'' are flown by teams of up to sixteen aircraft, although most teams fly between four and ten aircraft.〔The record is a 22-aircraft formation in 1958.〕 Some are state funded to reflect pride in the armed forces while others are commercially sponsored. Coloured smoke trails may be emitted to emphasise the patterns flown and/or the colours of a national flag. Usually each team will use aircraft similar to one another finished in a special and dramatic colour scheme, thus emphasising their entertainment function. Teams often fly V-formations (otherwise known as echelon formation)— they will not fly directly behind another aircraft because of danger from wake vortices or engine exhaust. Aircraft will always fly slightly below the aircraft in front, if they have to follow in line (the "trail formation"). Aerobatic maneuvers flown in a jet-powered aircraft are limited in scope as they cannot take advantage of the gyroscopic forces that a propeller driven aircraft can exploit. Jet-powered aircraft also tend to fly much faster, which increases the size of the figures and the length of time the pilot has to withstand increased g-forces. Jet aerobatic teams often fly in formations, which further restricts the maneuvers that can be safely flown. Aerobatics done at low levels and for an audience is called "stunt flying". To enhance the show effect of aerobatic maneuvers, smoke is sometimes generated; the smoke allows viewers to see the path travelled by the aircraft. Due to safety concerns, the smoke is not a result of combustion but is produced by the vaporization of fog oil into a fine aerosol, achieved either by injecting the oil into the hot engine exhaust〔"The smoke is generated by pumping smoke oil directly into the exhaust pipes just below the cylinder heads. The heat will vaporize, but not burn, the oil, creating thick white smoke. During an airshow routine, the smoke system will use around 5 gallons of smoke oil". http://www.northwestaerobatics.com/decathlon.htm〕 or by the use of a dedicated device〔(【引用サイトリンク】title=Patentscope: 1. (WO2006096918) Smoke Generator )〕 that can be fitted in any position on the aircraft. The first military aerobatic team to use smoke at will during displays was Fleet Air Arm 702 Squadron "The Black Cats" at the Farnborough Airshow in September 1957.〔"In June 1957 738 squadron was chosen to take part in a combined Naval display at the Farnborough Airshow in September 1957, despite having a full operational programme. It was decided to have a team of five Hawker Seahawks. They were the first aerobatic team to produce smoke at will, by modifying the fuel injection system." http://www.seayourhistory.org.uk/index2.php?option=com_content&do_pdf=1&id=600〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「aerobatics」の詳細全文を読む スポンサード リンク
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