This effect increases as the surface gets closer and so is the basis for self-stabilisation in ground effect . There is a relationship between strength of this effect and the wing span and wing cord. From a theoretical perspective the effect is equivalent to adding wingspan under conventional aerodynamics. Hence the ekranoplan requires smaller wings than a conventional aircraft. Such vehicles can be thought of as a cross between an aircraft and a hovercraft, but unlike the hovercraft which drags its air cushion with it, the ekranoplan generates its cushion as it passes.
Successful development requires a balance of forces often only achievable through experimentation.
In concept, such craft offer a potential form of transport which is faster than boats and slower than aircraft. They also offer greater fuel economy and the potential to carry heavier loads than aircraft. The main issues to be resolved are seaworthiness and safe operation. Because the models are experimental they are often tested when there is no one else about. Anyway, what I'm trying to say is that it is extremely difficult to operate a radio control set in one hand and a camera in the other.