EntityQ6043694· pop 5· linked from 11 articlesPackard X-2775Sign in to saveaircraft piston engine - X configurationConnectionsInternational Standard Book NumberEntityUnited States NavyEntityjet engineEntitySmithsonian InstitutionEntityUnited States Department of DefenseConceptaircraft engineEntityradial engineEntityV engineEntityNational Air and Space MuseumEntityreciprocating engineEntityflat engineEntitypound per square inchEntityengine displacementEntityV12Entitystraight engineEntityPackardEntitysuperchargerEntityvalvetrainEntityR-1830 Twin WaspEntityH engineEntityCategories1920s aircraft piston engines24-cylinder enginesAbandoned military aircraft engine projects of the United StatesPackard aircraft enginesX engines