Japan helicopter GEN H-4

Specifications of GEN H-4-----------------------------------------------------------------------------------Engines RotorsFlight Controls Frame PerformanceSafety Devices Future DevelopmentsEngine (Four GEN125 typeengines)Type? Displacement? Output power? Weight? RPM? Ignition? Fuel? Materials? Fuel consumption? TBO? Starting? Two-stroke, air-cooled, 125cc, horizontally opposed. Two-cylinder.10 hp per engine (40 hp with four)6.2 lb per engine7,000 to 8,000 rpm in normal flightCDI50:1 mixture of automobile gasoline and two stroke oil Aluminum crankcase, aluminum cylinders5 gal/hr( 18.9 l/hr) (total for four engines)500 hr (Engine itself. TBO of GEN H-4 is 100 hr.)Electric starters (for each engine).click here for more info on enginesRotors Diamet er?RPM? Pitch? Materials? Transmission Gear?Max input power? 4.0m (13'1")800-900 rpmFixed (Factory adjusted)CFRP compositeIntegral reduction gear and counter-rotating system 80 hpFlight Controls Roll & pitch? By the control bar (which travels the whole rotor head) Left hand (through an electric controlled differential gear) Right hand (throttle lever; operated with the right thumb)Yaw? Altitude?Frame Shock absorbent structure?Fuel tank? Aluminum pipeNot to exceed 5 gal (18.9 l) to be an "Ultra-light" aircraftPerformance Unloaded weight?Max takeoff weight? Endurance?Cruising speed? Ceiling?VNE? 70 kg (155 lb)200 kg (440 lb)30 to 60 min. (Depending on payload) 83 km/h (50 mph)2,000m (6,500 ft) (estimate)125 km/h (75 mph)Safety Devices- Four independent engines enable normal flight to continue with one engine out.- Emergency landing under full control is possible on two engines.- Ballistic parachute provided above the mast.Future Developments- Automatic altitude controller.- Under seat air bags.- Folding structure (for loading inside station wagon) (plan)Structure∙Control Pod∙Engine∙TransmissionStructure‘Its a interesting contraption, but there isn’t much to see.’Most onlookers in past airshows had the impression that theGENH-4 is just another interesting exhibit. It is true that thereis not much to see on the outside. The frame is 2inchaluminum pipe bent and welded, with a fiberglass backpackand funny looking wheels. The controls are direct, like manygyrocopters. In front of the pilot attached to the control bar isthe control pod with the throttle, tachometer, main, starterand yaw switches. The tools necessary for flight does notseem like much.But looking closely at the power pack you find four twincylinder engines feeding into a central transmission with twosets of rotors turning in opposite directions on top of thewhole assembly.Go to TopControlControlling the GEN H-4 is veryeasy.If you wanted to go forward,you would pull the control bartoward you. If you want to go to theright, you would move it to left, andwant to go left, move it to right. Ofcourse you can reverse thehelicopter. you only have to push itforward.The rise and descent are controlledby the throttle. If you push thethrottle lever, GEN H-4 goes up, youlet it, GEN H-4 goes down.If you wanted to turn to the right or Control Imageleft, you would pushyaw-control-switch by right hand. Put the pointer on this picture.Go to TopEngineDriving both sets of rotors are the four GEN 125engines. Boasting a TBO of 500 hours, it is a lightweight2stroke 10hp boxer twin with chrome cylinders andfully supported crankshafts. Each engine is equippedwith its independent ignition, carburetors, starter andcentrifugal clutches, the possibility of a total enginefailure is very low, but in the unlikely case of an enginefailure a stopped engine will not load the other enginesmaking continued flight possible. For those looking formaximum safety, provisions for a ballistic parachute hasbeen provided.Go to TopTransmissionThe transmission assembly is the center of the GEN H-4both in layout and mechanism. The lightweighttransmission consists of cast aluminum upper and lowercase with a total of 27precision ground, heat treated gearssandwiched in between. The gears act not unlike thedifferential gear in cars, equalizing the minute differencesin the drag on each set of carbon composite rotor blades,making tail rotors obsolete. Yaw is controlled in thetransmission through another set of gears driven by anelectric motor operated by pilot’s left thumb. SPECIFICATIONSDirection of rotation Counter clockwise from P.T.O.Type of Engine Air cooled two strokeflat twin gasolineengineCarburator WALBRO HAD typeDisplacement 124CC (7.56 cu.in.) Ignition system Solid state breakerless typeMaximum output (with muffler)10hp/8,500rpm(8hp/8,500 rpm: nottuned)Spark Plug CHAMPION RCJ-7YMaximum torque (with muffler)0.86kgm/6,500 rpm(0.7kgm/6,500 rpm)Weight(without muffler)2.8kgFuel Gasoline oil mixture(30:1)Dimensions280mm x 268mm x185mm。