EntityQ3785792· pop 6· linked from 45 articlesHirth HM 60Sign in to save1920s German aircraft engineConnectionsInternational Standard Book NumberEntitygasolineEntityWayback MachineEntitycarburetorEntitygas turbineEntityoctane ratingEntitytwo-stroke engineEntityaircraft engineEntityreciprocating engineEntitycompression ratioEntityengine displacementEntityHeinkelEntityvalvetrainEntitystrokeEntitypower-to-weight ratioEntityaerospace manufacturerEntityboreEntityKlemm Kl 35EntityKlemm Kl 25Entitypower densityEntityCategories1920s aircraft piston enginesAircraft air-cooled inline piston enginesHirth aircraft enginesInverted aircraft piston enginesStraight-four engines