🌐EnglishEnglishDeutschEspañolFrançaisItalianoالعربية中文日本語EntityQ15921165· pop 5· linked from 219 articlesR-975 WhirlwindR-9 piston aircraft engine, final nine cylinder series of the WhirlwindConnectionsVultee BT-13 ValiantEntityFederal Aviation AdministrationEntityCategories1920s aircraft piston enginesAircraft air-cooled radial piston enginesTank enginesWright aircraft engines