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GEN H-4
The GEN H-4 is a Japanese helicopter under development by GEN Corporation of Nagano. The aircraft is intended to be supplied as a kit for amateur construction.〔Bayerl, Robby; Martin Berkemeier; et al: ''World Directory of Leisure Aviation 2011-12'', page 191. WDLA UK, Lancaster UK, 2011. ISSN 1368-485X〕
==Design and development==
The H-4 was designed to comply with the US FAR 103 Ultralight Vehicles rules, including the category's maximum empty weight of . The aircraft has a standard empty weight of . It features two contra-rotating main rotors, a single-seat open cockpit without a windshield, four-wheeled landing gear and four twin-cylinder, air-cooled, two-stroke, GEN 125-F engines to provide operational redundancy since the aircraft cannot autorotate in the event of a power failure.〔
The aircraft fuselage is a simple open frame with a seat mounted on it. Its two coaxial, contra-rotating two-bladed rotors have diameters of . The main rotors are both of fixed pitch design, with no articulation in any axis. Steering is accomplished by pivoting the rotor head on a gimbal using a control handle, in a similar manner to a weight shift hang glider. Climb and descent is controlled by increasing and decreasing the throttle. The aircraft lacks a tail rotor as the coaxial, contra-rotating main rotors produce zero net torque. Yawing motion is produced and controlled by electronic gyroscopically-controlled differential electric braking of the main rotors. With its empty weight of and a gross weight of the H-4 has a useful load of . With full fuel of the payload is .〔
The company indicated that it had suspended production plans by 2012 due to lack of dealers outside Japan and put the cost of a single H-4 at JPY 7,500,000.00 (about US$80,887.59 in 2013). The company stated that it could build the aircraft economically only in lots of ten and at a discounted rate only in lots of one hundred. To facilitate future production the company indicated that it was "looking for sponsors, investors and partners".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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