America Military Pulsejet & Ramjet Designations

The following table provides a brief reference list of U.S. pulsejet and ramjet engines in order by their military designation. The following information is provided:

• Manufacturer: The designer and builder of the engine; some engines were developed and built by multiple companies.
• Model: The manufacturer's internal model designation of the engine.
• Designation: The military designation of the engine, which consists of a Type designation (PJ = Pulsejet or RJ = Ramjet) and sequence number. For unknown reasons, the numerical sequence was started at 30, with even numbers being assigned to US Navy projects and odd numbers being assigned to US Army and Air Force projects. These were followed by a manufacturer's code and subtype; for example J79-GE-19 indicates 79th turbojet procured, designed and/or manufactured by General Electric, 19th subvariant of this design. The subtype numbers were again assigned to military branch, with even numbers being used for US Navy projects and odd numbers being used for US Army and Air Force projects. Sometimes further changes were signified by an additional letter (J79-GE-19A), with 'W' being used for engines with water injection and 'WA' being used for engines with water-alcohol injection; the letters 'I' and 'O' were not used.
• Aircraft: US military aircraft or projects which utilized the engine (other aircraft not listed).

PJ = Pulsejet       Manufacturer Model Designation Aircraft ? ? PJ30 ? Ford ? PJ31 ? Solar ? PJ32 ? Giannini ? PJ33 ? ? ? PJ34 ? Giannini ? PJ35 ? ? ? PJ36 ? Giannini ? PJ37 ? ? ? PJ38 ? Giannini ? PJ39 ? Marquardt ? PJ40 ? ? ? PJ41 ? McDonnell -- PJ42 ? ? ? PJ43 ? ? ? PJ44 ? ? ? PJ45 ? Marquardt ? PJ46 ? ? ? PJ47 ? ? ? PJ48 ? American Helicopter ? PJ49 H-26 Manufacturer Model Designation Aircraft

RJ = Ramjet       Manufacturer Model Designation Aircraft Marquardt C-20 RJ30 ? Marquardt C-30 RJ31 ? ? ? RJ32 ? ? ? RJ33 ? Marquardt ? RJ34 ? Continental ? RJ35 ? ? ? RJ36 ? Menasco A-J-20 RJ37 ? ? ? RJ38 ? Marquardt C-48 RJ39 ? Pratt & Whitney ? RJ40 ? Wright ? RJ41 ? -- -- RJ42 not assigned? Marquardt ? RJ43 X-7 -- -- RJ44 not assigned? Continental R-20 RJ45 ? -- -- RJ46 not assigned? Wright ? RJ47 X-7 -- -- RJ48 not assigned? Continental ? RJ49 ? -- -- RJ50 not assigned? Wright ? RJ51 ? -- -- RJ52 not assigned? ? ? RJ53 ? -- -- RJ54 not assigned? Wright ? RJ55 F-103 -- -- RJ56 not assigned? Marquardt ? RJ57 ? -- -- RJ58 not assigned? Marquardt ? RJ59 Kingfish Manufacturer Model Designation Aircraft

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