EntityQ206420· pop 9· linked from 232 articlesO-235Sign in to savefour-cylinder horizontally-opposed piston aircraft engine familyConnectionsPA-38 TomahawkEntityT55EntityRobin DR-200EntityUnited StatesCountrycarburetorEntitypistonEntityUnited States Department of DefenseConceptgas turbineEntityFederal Aviation AdministrationEntityturbofanEntityturbopropEntityaircraft engineEntityradial engineEntityV engineEntityPratt & WhitneyEntityflat engineEntitycompression ratioEntityengine displacementEntitystraight engineEntityvalvetrainEntityCategories1930s aircraft piston enginesAir-cooled aircraft piston enginesBoxer enginesFour-cylinder enginesLycoming aircraft engines