Sikorsky S-72

Rarity: Common

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Invention

Domain

Science and technology

Knowledge cost

2

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What Wikipedia says

The Sikorsky S-72 was an experimental Sikorsky Aircraft compound helicopter developed as the Rotor Systems Research Aircraft (RSRA) for the National Aeronautics and Space Administration (NASA) and the United States Army. The RSRA was a testbed for rotor and propulsion systems for high-speed.

Excerpt from the Wikipedia article “Sikorsky S-72”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA/Larry Sammons, Public domain, via Wikimedia Commons.