SUSTAINABILITY OF EKRANOPLAN MOVEMENT WITH SMALL EXTERNAL INFLUENCES

Abstract

A basic problem at planning of ekranoplan is a problem of providing of acceptable firmness and controllability. Wing in ground effect craft - in wide sense - dynamically unstable and difficult object. It is therefore accepted to determine the features of firmness and controllability on separate parameters, for example, after the corner of attack, speed. It is also necessary to provide him acceptable operating properties in the process of their realization in practice.

As an air-craft-in-ground-effect is a research object, it is necessary to take into account such factors, as distance from a screen (height of flight) - is one of aspects that directly influence on aerodynamic descriptions. In addition, the nonlinear dependence of aerodynamic characteristics on such kinematic parameters as: angle of attack, angular deviations of aerodynamic control surfaces was revealed. Emerging non-stationary effects have a significant impact on the dynamics of movement, ie the value of aerodynamic coefficients is constantly changing over time. Due to the proximity of the underlying surface, the presence of irregularities on it increases the requirements for stability and accuracy of control of the ekranoplan.

Vessels that use the screen effect are a new class of aircraft, usually aerodynamic configurations, focused on taking advantage of flight in the area of influence of the screen effect. The effect of the screen is manifested in the increase in the coefficient of lift and aerodynamic quality. aircraft at distances from the rear edge of the wing to the water surface less than the length of the chord of the wing. The aerodynamic quality of the ekranoplan at relative cruising altitude above the screen may be the same as that of modern passenger aircraft. This level of quality is achieved at much lower wing aspect ratios than aircraft.