The folding test flight was successful

In 1938, the young German girl Hannareich flew a twin-rotor helicopter to perform a perfect air show at the Berlin Stadium. The helicopter is known as the world's first successful test flight helicopter.

In 1936, the German company Fokker publicly presented its own FW-61 helicopter after making various improvements to earlier helicopters. The power plant was a piston engine with a power of 140 hp. The aircraft has a speed of 100~120 kilometers per hour, a range of 200 kilometers, and a take-off weight of 953 kilograms.

The helicopters developed by the French and Germans, although successful, were far from practical and did not enter the ranks of modern helicopters.

Fold a real helicopter

In the spring of 1939, the American Igor Sikorsky completed all design work on the VS-300 helicopter, and in the summer of the same year a prototype was built. He managed to lift the world's first real helicopter, the VS-300, into the air. It is a single-rotor tail rotor helicopter with three blades of rotor with a diameter of 8.5 meters and a tail rotor with two blades at the tail. Its fuselage is a welded steel tube structure, and the transmission device is composed of V-belts and gears. The landing gear is rear-three-point, and the cockpit is fully open. The power plant was a four-cylinder, 75 hp air-cooled engine. This single-rotor and tail-rotor helicopter configuration has become the most common helicopter configuration today. [12]

Since the first tethered flight, Sikorsky has continued to improve the VS-300, gradually increasing the power of the engines. On May 13, 1940, the VS-300 made its first free flight, when a 90-horsepower Franklin engine was installed.

"Butterflies and Spies" answers the saying that there was no helicopter in November 1940 is in the hand, please wait a moment,

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