Japan has Developed the world’s smallest one-man helicopter. Its rotor length of 3.9 meter sand rotors powered by two 10HP engines. The GEN H-4 has two rotors turning in opposite directions to maintain stability, and four engines that enables a 30-minute flight with a top speed of about 56 miles per hour. Current price for a GEN H-4 prototype is JPY 7,500,000.00 or about USD 100,000.00 due to small production capacity. Inventor Gennai Yanagisawa 75-year-old has created a aluminum-framed 75kg (165 pound) one-man aircraft which sets the world record for the smallest helicopter in the world in terms of weight.
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