EntityQ4039128· pop 5· linked from 8 articlesGEN H-4Sign in to saveJapanese helicopter designConnectionsJapanCountryUnited States dollarEntityyenEntityhelicopterEntityInternational Standard Serial NumberEntityNaganoEntitygyroscopeEntitytwo-stroke engineEntityundercarriageEntityaircraft registrationEntityfuselageEntityhang glidingEntityaircraft principal axesEntityaerospace manufacturerEntityautorotationEntityhomebuilt aircraftEntityCategories2000s Japanese helicopters2000s Japanese sport aircraftCoaxial rotor helicoptersFour-engined piston helicoptersHomebuilt aircraft