Unfortunately, Simple Planes doesn't simulate ground effect, therefore it is impossible to design a real ekranoplan. In order to simulate the flght of the KM, you must therefore balance the flight manually. Depending on the fuel level, a speed of around 380mph will be ideal to have a perfectly balanced flight where you can hover close above the water.

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Info:
The KM was designed in 1964 – 1965, and was unique in size and payload. The first spy photographs from American spy satellites showed a strange aircraft carrying letters "KM" on its fuselage. CIA disambiguated it as "Kaspian Monster", while it actually meant "Korabl maket" – "prototype ship" in Russian. Chief designer for this aircraft was Rostislav Alexeyev, and the lead engineer was V. Efimov. Until the construction of the An-225 it was the largest aircraft in the world. It was designed to fly at an altitude of 5-10 meters in order to utilize the ground effect. The KM was designed as a special vehicle for the military and rescue teams. However designing such a machine caused serious difficulties. It was documented as a marine vessel and prior to the first flight a bottle of champagne was broken against its nose. It displayed the Soviet Navy Flag and was assigned to the Soviet Navy, since the ground effect is only possible within several meters from the surface. The new vehicle was, however, piloted by air force test pilots.