9/19/2023 0 Comments Supercritical airfoil![]() However, the aerodynamic performance of supercritical airfoils is extremely sensitive to the shape of airfoil and the operating conditions. ![]() This remarkable aircraft is to this day the fastest airliner with a maximum cruise Mach number of 0.89 and flew first in 1962.īoeing became aware of supercritical airfoils only after the original 737 was designed, so the redesigned wing of the classic series carries some of the baggage carried over from the earlier design. Supercritical airfoils are especially useful for improving the aerodynamic performance in transonic range, reducing drag and improving position control 1. The first operational supercritical airfoils, at the time called rooftop due to the roof-like shape of the upper surface pressure distribution, were employed by Vickers in the VC-10. Whitcomb at NASA a quarter of a century later. Kawalki in Germany in 1940, who arrived at identical shapes as R. It was a redesign on the original 737 wing, extended by 4.4% of chord at the leading edge and overall a compromise between high commonality with the earlier design and improved aerodynamics.Īt the time when the " classic" series of the 737 was designed in the late Seventies/early Eighties, supercritical airfoils were already firmly established. However, this airfoil does not take those techniques to their extreme. ![]() rear loading: Higher camber at the rear, thinner part of the airfoil,.higher curvature at the bottom, resulting in negative camber around mid-chord.very little curvature on the top surface at mid-chord.The plot of the BACXXX above shows typical contour characteristics of supercritical airfoils: Most notably, the Boeing 777 is also designed with a supercritical wing and as such is the most efficient commercial wing ever invented (Boeing Company, n.d.).Supercritical yes, but early? Not really.īACXXX airfoil plot, shamelessly copied from . Details: Dat file: Parser (lg10sc-il) LOCKHEED-GEORGIA SUPERCRITICAL AIRFOIL Lockheed-Georgia/NASA/Blackwell rotorcraft airfoil Max thickness 10 at 32 chord. The Air Force cargo transport plane, the C17 employs a supercritical aerofoil giving it excellent performance for an aircraft of its size. The supercritical pressure CO2 (SCO2) Brayton cycle is an efficient. Today, supercritical aerofoils are employed on many aircraft. supercritical CO2 in a modified airfoil fins heat exchanger. By employing the supercritical aerofoil the aircraft could safely reach speed of 0.90-0.95 mach, alternatively, they could continue to cruise at their normal speeds but burn significantly less fuel (Day, 2004). Passenger airliners at the time, such as the Boeing 707, were limited to cruise speeds of around 0.70-0.80 mach. ![]() Not only did the supercritical aerofoil allow aircraft to break the sound barrier but it also allowed them to cruise much closer to the speed out sound whilst delaying the onset of wave-drag. Full scale testing was varied out of a modified Vought F-8U and these studies were confirmed. Initial wind tunnel tests suggested the aerofoil would allow aircraft to fly 10% faster and would be better able to break through the sound barrier. In the early 1960, NASA engineer Richard Whitcomb proposed a new aerofoil shape that he believed would overcome these complications. Early supersonic aircraft found it very difficult to break the sound-barrier because of the wave drag created by traditional aerofoils. ![]()
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