For starters let me clear that the Focke-Wulf FW 61 was built in 1936 and the VS-300 built by Igor Sirkosky first flew in 1939. So I have just established that the FW-61 was the first functional helicopter ever built.
The FW 61 was founded by the German company Focke Achgelis under professor Henrich Focke. It was inpired by the Focke-Wulf Fw 186, which is a one man gyro, which he had built earlier.
The FW 61 first flew in June 1936 for a mere 10 seconds piloted by Ewald Rohlfs. Later on it was enhanced and worked upon. On 25 June 1937 the FW- 61 piloted by Ewald Rohlfs flew upto an altitude of 2439m. It also showed an impressive endurance of 1 hr. 20 min. 49 sec. and covered a distance of 80.604km in a straight line and 122.553km in a closed circuit. The helicopter was further enhanced in the next few years. Only 2 of them have been built in total.
Specifications- Focke-Wulf Fw 61
The following topic can be a very debatable one. Just like airplanes, helicopters too have multiple inventors. But I would still say that the FW-61 built in those days with limited technology is a marvel.
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