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 cognizance by way of Congress and the Air strength on bettering army airplane gas potency. One motion thought of is amendment of the aircraftâ€™s wingtip through fitting, for instance, winglets to minimize drag. whereas universal on advertisement plane, such alterations were much less so on army airplane. In an try to motivate higher Air strength use during this quarter, Congress, in H. Rept. 109-452, directed the Air strength to supply a document studying the feasibility of editing its plane with winglets. to aid during this attempt, the Air strength requested the NRC to guage its airplane stock and determine these airplane that could be sturdy applicants for winglet alterations. This reportâ€"which considers different wingtip ameliorations as well as wingletsâ€"presents a assessment of wingtip alterations; an exam of earlier analyses and adventure with such adjustments; and an evaluation of wingtip transformations for numerous Air strength plane and strength funding strategies.
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Additional resources for Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft
This option is especially attractive for aircraft having substantial structural margins. Wing Retrofits Several approaches to wing retrofits, which increase the effective aerodynamic span, are possible. The addition of winglets is perhaps the most obvious approach—obvious because of the recent success of winglet retrofits for the Boeing 737s and 757s and because the effective span may be increased without changes to the geometric span. Simple wingtip span extensions are also viable alternatives for reducing fuel consumption.
This increased climb rate allows the use of airports having shorter runways and allows for operations from airports located at higher altitudes and in hotter climates. Alternatively, these advantages may be traded for carrying higher payloads or a combination of both. 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.
18Ibid. 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.