Kamov Ka-15

Rarity: Common

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Invention

Domain

Science and technology

Knowledge cost

1

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What Wikipedia says

The Kamov Ka-15 (NATO reporting name Hen) is a Soviet two-seat utility helicopter with coaxial rotors, which first flew on 14 April 1952 at the hands of test pilot D. K. Yefremov. It was the world's first mass-produced coaxial helicopter.

Excerpt from the Wikipedia article “Kamov Ka-15”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Alan Wilson, CC BY-SA 2.0, via Wikimedia Commons.