| Popis: |
Some investigators of WIG, Wing-in-Ground effect vehicles, suppose that high values of lift coefficient (CL) for WIG's are desirable at the cruising condition; it seems to result from the old term “Ram-Wing.” This paper treats high-speed large-scale WIG's only for transportation such as Orlyonok. It is shown that as higher cruising speed as possible is required for higher transportation efficiency and so considerable width of CL values are necessary. Hence it is an important problem how the lower value of CL may be allowable without deteriorating the operational efficiency. It is found that CL of nearly 0.6 are acceptable and cruising speed of 480km/h is expected with effective aspect ratio of 10-12. Thus lower camber shapes of airfoil, which give the center-of-pressure of nearly 25-33% chord positions, may be usable against the image of “ram-wing.” It would bring an additional considerable merit that many troublesome problems of trim, stability and control may be solved much more easily. |
