New PDF release: Aerodynamic Design of Transport Aircraft

By E. Obert

ISBN-10: 1441616101

ISBN-13: 9781441616104

ISBN-10: 1586039709

ISBN-13: 9781586039707

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For a certain flap setting the weight-versus-field-length plots are limited by the WAT limit. 2 and has an available take-off field length of 10000 ft leading to a maximum take-off weight MTOW = 400,000 lb. 1. This then leads to a maximum take-off weight MTOW = 380,000 lb, a reduction of about 5%. This may not seem much, but an aircraft like the Boeing 767 has an empty weight fraction of 50% of the maximum take-off weight, a fuel fraction of 35% and a payload fraction of just 15%. The reduction in take-off weight reduces the payload weight to 10% of the original take-off weight.

At landing achievement of a high maximum lift coefficient is dominant but modern noise requirements limit the acceptable drag levels in the landing configuration. 10 shows the variation of (L/D)V2 with (CL)V2 for different aircraft. 11. The diagram shows how the lift-drag polar shifts up and to the right with increased flap setting: an increase in maximum lift comes with an increase in drag. 10 - Generalized take-off. Source : E. 11 - Low-speed polars for a transport aircraft 21 AERODYNAMIC DESIGN OF TRANSPORT AIRCRAFT The main parameters for take-off are the take-off lift coefficient CLTO, the drag coefficient and the thrust to weight ratio which gives the aircraft acceleration and determines the climb gradient.

Source : Mick Bajcar 31 AERODYNAMIC DESIGN OF TRANSPORT AIRCRAFT After 1940, (limited) theoretical analysis, with an emphasis on airfoils, was done by those that had “computing power” – large research institutes and airframe manufacturers. This resulted in, for example, the NACA 6-series laminar flow airfoils. With the advent of jet engines and aircraft flying near the speed of sound, a return to windtunnel experiments took place, as the computer codes of that time were not capable of handling transonic (mixed subsonic and supersonic) flow.

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Aerodynamic Design of Transport Aircraft by E. Obert


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