Supercritical airfoil in the context of "Boeing 757"

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👉 Supercritical airfoil in the context of Boeing 757

The Boeing 757 is an American narrow-body airliner designed and built by Boeing Commercial Airplanes.The then-named 7N7, a twinjet successor for the trijet 727, received its first orders in August 1978.The prototype completed its maiden flight on February 19, 1982, and it was FAA certified on December 21, 1982.Eastern Air Lines placed the initial 757-200 variant in commercial service on January 1, 1983.A package freighter (PF) variant entered service in September 1987 and a combi model in September 1988.The stretched 757-300 was launched in September 1996 and began service in March 1999. After 1,050 had been built for 54 customers, production ended in October 2004, while Boeing offered the largest 737 Next Generation variants as a successor to the -200.

The jetliner is powered by 36,600–43,500 lbf (163–193 kN) Rolls-Royce RB211 or Pratt & Whitney PW2000 underwing turbofan engines for a 255,000–273,000 lb (116–124 t) maximum takeoff weight (MTOW).The 757 has a 2,000 sq ft (185 m) supercritical wing for reduced aerodynamic drag and a conventional tail.It keeps the 707 fuselage width and six–abreast seating and its two-crew glass cockpit has a common type rating with the concurrently designed 767 (a wide-body aircraft).It was produced in two fuselage lengths: the 155 ft (47.3 m) long 757-200 (the most popular with 913 built) typically seats 200 passengers in two classes over 3,915 nautical miles [nmi] (7,250 km; 4,505 mi); while the 178 ft (54.4 m) long 757-300 typically seats 243 over 3,400 nmi (6,295 km; 3,900 mi).The 757-200F can haul a 72,210 lb (32,755 kg) payload over 2,935 nmi (5,435 km; 3,378 mi).Passenger 757-200s have been modified for cargo use as the Special Freighter (SF) and the Precision Converted Freighter (PCF).

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Supercritical airfoil in the context of Boeing 767

The Boeing 767 is an American wide-body airliner developed and manufactured by Boeing Commercial Airplanes.The aircraft was launched as the 7X7 program on July 14, 1978, the prototype first flew on September 26, 1981, and it was certified on July 30, 1982. The initial 767-200 variant entered service on September 8, 1982, with United Airlines, and the extended-range 767-200ER in 1984. It was stretched into the 767-300 in October 1986, followed by the extended-range 767-300ER in 1988, the most popular variant. The 767-300F, a production freighter version, debuted in October 1995. It was stretched again into the 767-400ER from September 2000.

Designed to complement the larger 747, it has a seven-abreast cross-section accommodating smaller LD2 ULD cargo containers.The 767 is Boeing's first wide-body twinjet, powered by General Electric CF6, Rolls-Royce RB211, or Pratt & Whitney JT9D turbofans. JT9D engines were eventually replaced by PW4000 engines.The aircraft has a conventional tail and a supercritical wing for reduced aerodynamic drag.Its two-crew glass cockpit, a first for a Boeing airliner, was developed jointly for the 757 − a narrow-body aircraft, allowing a common pilot type rating. Studies for a higher-capacity 767 in 1986 led Boeing to develop the larger 777 twinjet, introduced in June 1995.

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Supercritical airfoil in the context of Transonic

Transonic (or transsonic) flow is air flowing around an object at a speed that generates regions of both subsonic and supersonic airflow around that object. The exact range of speeds depends on the object's critical Mach number, but transonic flow is seen at flight speeds close to the speed of sound (343 m/s at sea level), typically between Mach 0.8 and 1.2.

The issue of transonic speed (or transonic region) first appeared during World War II. Pilots found as they approached the sound barrier the airflow caused aircraft to become unsteady. Experts found that shock waves can cause large-scale separation downstream, increasing drag, adding asymmetry and unsteadiness to the flow around the vehicle. Research has been done into weakening shock waves in transonic flight through the use of anti-shock bodies and supercritical airfoils.

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