The ESKA Ekranoplan was flow for 10 years on the Volga River. A wonderful ground effect aircraft,it was a realization of the Lippisch design. I did not design this one (I am working on a far more detailed one). It came from the Soviet Era, and it's designer is unknown. The model itself concludes with a very nice representation of this aircraft. There is on flaw easily fixable, Make sure when you build it, and it sits on a flat surface, the outer pontoons are level with the hull, such that all three surfaces are touching that surface. When the real craft sat in the water, the rear edge of the wing was two inches underwater!