Is The “Caspian Sea Monster” a Boat, Or a Plane?

At the height of the cold war, the CIA is confounded by a powerful new weapon dubbed the Caspian Sea Monster.

The Caspian Sea Monster, officially «KM» (Korabl Maket, Russian – Корабль-макет Experimental Craft), also known as the “Kaspian Monster”, was an experimental ground effect vehicle (or ekranoplan)—a craft that flies, but stays close to the surface so it can rely on the ground effect. It was developed at the design bureau of Rostislav Alexeyev.

The KM was designed in 1964–1965, and was unique in size and payload. The first 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. The chief designer for this aircraft was Rostislav Alexeyev and the lead engineer was V. Efimov.

Credit: wikipedia

The ekranoplan had wingspan of 37.6 m, length – 92 m, maximum take-off weight – 544 tons. Until the An-225, it was the largest aircraft in the world. It was designed to fly at an altitude of 5–10 meters to use the ground effect.

KM was designed as a special vehicle for the military and rescue teams. However designing such a machine caused serious difficulties.

Credit: geocities

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.

Source: wikipedia


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