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A powered parachute often abbreviated PPC and also called a motorised parachute or paraplane is a type of ultralight aircraft that consists of a parachute with a motor and wheels. The aircraft's airspeed is typically about 25–35 mph (40–60 km/h). PPCs operate safely at heights ranging from a few feet off the ground (while ground skimming, a popular use of the aircraft) to altitudes as high as 10,000+ feet (5.5 km). But typical operating heights are between 500 and 1500 feet (150–500 meters). Equipped with the standard 5 or 10 gallon fuel tank, PPCs can typically be flown for about three hours. They have very short take-off and landing rolls, sometimes less than 100 ft (30 m). PPCs are among the least expensive aerial vehicles. A new one-person powered parachute may cost as little as $5,000, though double-seaters more typically cost about $10,000. Top end two-seater PPCs usually cost $15,000–$25,000. Empty weight is typically around 200–300 lb (90–135 kg) and payload can be upwards of 500 lb (225 kg). In the United States, most single place PPCs are flown under part 103 of the Federal Aviation Regulations and, therefore, may be flown without a license or flight instruction. Flight instruction is, however, highly recommended, and an average student can learn to fly a PPC safely with 5 to 10 hours of flight instruction. Two-seat PPCs are light sport aircraft in the United States. The pilot must have at least a sport pilot certificate issued by the FAA to fly them. A minimum of 10 hours of flight instruction, and 2 hours of solo as a student pilot, is required to obtain this certificate. Powered parachuting is not to be confused with powered paragliding. == Safety == PPCs are often considered to be safer than normal fixed-wing aircraft because of their inherent stability, limited response to control inputs, and stall resistance. There are two primary means to control a PPC: increasing or decreasing engine power (which controls vertical rate of climb) and deflecting the right or left trailing edge of the parachute—typically by moving the steering bars with the feet—which turns the aircraft right or left. If the trailing edge of the wing is pulled in on both sides at the same time, the aircraft "flares", i.e., slows and temporarily gains additional lift. The flare is generally used to make fine adjustments in altitude when flying close to the ground and, in particular, when landing. The power-off glide ratio of a powered parachute ranges from 3:1 to 6:1. Glide ratio varies depending on the chute size and shape, and the weight that the chute is carrying. Engine-off landings are generally safe, provided that the aircraft is within glide range of a suitable landing zone and the pilot is properly trained in the use of proper "flaring" technique. "Flaring", in terms of powered parachuting, refers to the usage of the steering bars pushed out simultaneously, causing the aircraft to rock forward. This is caused by the reshaping of the rear of the wing or parachute, which is pulled downwards. This results in the entire aircraft rocking on the lateral axis, thus slowing the aircraft momentarily, allowing an engine-out landing to become less brutal within the last few feet off the ground. Done properly, flaring will allow an engine-out landing to be much smoother than simply relying on the lift of the ram-air canopy to cushion the landing. Although possible, it is difficult to cause the aircraft to get into a dangerous attitude, stall, or chute collapse by means of pilot control inputs. Chute collapse is considered by many pilots to be virtually impossible with square wings. The wing is more likely to collapse with the more maneuverable, but inherently less stable, elliptical wing, but such collapses are normally followed by an immediate reflation and often go unnoticed by the pilot. In the rare circumstances where an elliptical wing collapses, the collapse is caused either by some extreme adverse meteorological condition or by pilot error. The Federal Aviation Administration reports that over 80 percent of all aviation accidents are due to pilot error.〔http://www.faa.gov/library/manuals/aviation/pilot_handbook/media/phak%20-%20chapter%2017.pdf〕 Inflatable ram-air elliptical wings can have upward of 30 individual cells whereas square wings typically have fewer than 13 cells. The main hazards one faces while flying a powered parachute are associated with wind and obstacles. Flight should not be attempted in winds exceeding 10–15 mph or in gusty conditions.〔http://www.siteground183.com/~sixchut1/wp-content/uploads/2012/10/Getting-Started-in-Powered-Parachutes.pdf〕 Wind hazards include terrain-induced air disturbances called rotors (it is advisable to stay upwind of trees, mountains, and other obstacles that disturb the flow of the wind). Wake turbulence created by the passage of other aircraft (referred to as "wingtip vortices"), especially aircraft that are heavy, aerodynamically "dirty", and slow, pose another significant hazard. Also, since the slow-moving powered parachutes, like helicopters, are particularly well equipped to fly safely near the ground, special care must be taken to avoid power lines, trees, and other low-level terrain obstacles. 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「Powered parachute」の詳細全文を読む スポンサード リンク
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