GEN H-4 is the world's smallest co-axial helicopter ever made. This is a Japanese designed and manufactured ultralight one-man helicopter. Smallest helicopter in the world 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 .This is not only the lightest helicopter in the world, but it is the easiest to fly! You dont require a license to fly the GEN H-4 in Japan and the inventors claim it is easy as riding a bicycle and with just 2 hours of practice you can master it. The controls also resemble a bicycle handle. As far as its price is concerned, it worth approx $32,500 (¥3,780,000).