By National Research Council, Division on Engineering and Physical Sciences, Air Force Studies Board, Committee on Assessment of Aircraft Winglets for Large Aircraft Fuel Efficiency
The excessive expense of aviation gasoline has ended in elevated realization by way of Congress and the Air strength on enhancing army plane gas potency. One motion thought of is amendment of the aircraftâ€™s wingtip through fitting, for instance, winglets to lessen drag. whereas universal on advertisement plane, such adjustments were much less so on army airplane. In an try and inspire better Air strength use during this sector, Congress, in H. Rept. 109-452, directed the Air strength to supply a file studying the feasibility of editing its airplane with winglets. to help during this attempt, the Air strength requested the NRC to guage its plane stock and establish these airplane which may be reliable applicants for winglet alterations. This reportâ€"which considers different wingtip transformations as well as wingletsâ€"presents a evaluate of wingtip changes; an exam of prior analyses and adventure with such adjustments; and an evaluate of wingtip changes for numerous Air strength airplane and strength funding strategies.
Read Online or Download Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft PDF
Similar repair & maintenance books
This textbook is a suite of technical papers that have been offered on the tenth foreign Symposium on Unsteady Aerodynamics, Aeroacoustics, and Aeroelasticity of Turbomachines held September 8-11, 2003 at Duke collage in Durham, North Carolina. The papers signify the most recent in cutting-edge learn within the components of aeroacoustics, aerothermodynamics, computational tools, experimental checking out regarding movement instabilities, flutter, compelled reaction, multistage, and rotor-stator results for turbomachinery.
A part of a sequence of manuals for motor vehicle or bike vendors, this version presents details on regimen upkeep and servicing, with initiatives defined and photographed in a step by step series in order that even a beginner can do the paintings.
Knowing airworthiness is primary to keeping and working plane competently. whereas no publication can exchange the broadcast FAR/JAR documentation for airworthiness, this precise consultant offers readers with a unmarried connection with knowing and reading the airworthiness specifications of the ICAO (International Civil Aviation Organisation), FAA (the US Federal Aviation Authority) and EASA (European airplane defense Agency).
The authors study intimately the basics and mathematical descriptions of the dynamics of vehicles. during this context assorted degrees of complexity might be awarded, beginning with uncomplicated single-track types as much as advanced 3-dimensional multi-body versions. a selected concentration is at the strategy of developing mathematical types at the foundation of actual vehicles and the validation of simulation effects.
- Flugzeugtriebwerke: Grundlagen, Aero-Thermodynamik, ideale und reale Kreisprozesse, Thermische Turbomaschinen, Komponenten, Emissionen und Systeme
- Planetary Rovers: Robotic Exploration of the Solar System
- Vehicle Thermal Management Systems Conference and Exhibition (VTMS10)
- Finite Element Methods:: Parallel-Sparse Statics and Eigen-Solutions
- Optimisation of composite structures design
Extra resources for Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft
Whitcomb, 1976, “A design approach and selected wind-tunnel results at high subsonic speeds for wing-tip mounted winglets,” NASA TN D-8260. 11Ilan Kroo, 2005, “Nonplanar wing concepts for increased aircraft efficiency,” VKI Lecture Series on Innovative Configurations and Advanced Concepts for Future Civil Aircraft, June 6-10. FIGURE 2-1 Wingtip modifications with a variety of geometries have been tested and deployed on both commercial and military aircraft. SOURCE: Courtesy of Doug McLean, “Wingtip devices: What they do and how they do it,” Presentation at the Boeing Performance and Flight Operations Engineering Conference, September 2005.
Critical performance constraints for military aircraft can be dictated by either airfield constraints or a combat situation. For example, at an airfield in hostile territory, a steep climb out may be desired to reduce the time an aircraft is vulnerable to surface-to-air threat systems around the airfield. Another example would be takeoff and landing constraints at a commercial airport where military tankers, airlift, or ISR platforms may also have to operate. Challenges associated with wingtip modifications The potential benefits of wingtip modifications do not come without a price.
46 ASSESSMENT OF WINGTIP MODIFICATIONS • • • • Ferry costs, Fuel (use forward-fuel-curve-based futures market), Airport gating loss, modifications, or flexibility costs, and Maintenance hangar modifications at bases and airports. The business case for installing winglets considers the following benefits: • • • • • Improved fuel burn, Engine derate, Possible new markets due to increased range, Additional payload, and Change in residual value of the aircraft. Other factors for consideration: • Lease agreements, • Coordinating modifications with other base maintenance visits, and • Economic life of aircraft.
Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft by National Research Council, Division on Engineering and Physical Sciences, Air Force Studies Board, Committee on Assessment of Aircraft Winglets for Large Aircraft Fuel Efficiency