Northrop X-4 Bantam Aircraft Manuals and Data Collection

The Northrop X-4 Bantam was a semi-tailless, twin-jet research aircraft built by Northrop Aircraft, Inc. Two airframes (USAF serials 46-676 and 46-677) flew between 1948 and 1953 in a joint USAF and NACA program that examined whether removing the horizontal tail avoided shock-induced stability problems near Mach 0.9. This digital collection brings together period airframe and engine documentation for the X-4 and the Westinghouse J30 engine family, together with a clearly separated modern research report.

Living Collection with Free Lifetime Updates: This collection continues to grow. As further X-4, J30 or related documentation is verified and added, purchasers receive the additions at no extra cost.

Collection documents

• Flight Operating Instructions for USAF Model X-4 Airplane, Report No. HE-25, prepared by Northrop Aircraft, Inc., Hawthorne, California, 15 October 1948, 62 pages. Published under joint authority of the Commanding General, Army Air Forces, and the Chief of the Bureau of Aeronautics. The cover bears a classification-cancellation stamp citing AFR 205-14.
• Handbook of Overhaul Instructions for Models J30-P-20 and J30-WE-20 Aircraft Engines, AN 02B-110AA-3, superseding the edition dated 15 July 1948, revised 1 July 1949.
• Handbook of Service Instructions for Models J30-P-20 and J30-WE-20 Aircraft Engines, AN 02B-110AA-2, dated 15 June 1950, revised 1 March 1951, superseding the edition dated 15 February 1950.

Scope note: The two engine handbooks cover the J30-P-20 and J30-WE-20 variants of the Westinghouse J30 family. The X-4 airframes flew XJ30-WE-7/-9 engines; these handbooks are included as J30 family documentation and are not stated to be specific to the X-4's own engine configuration.

Sicuro Publishing research report

Clearly separated from the period documents: Northrop X-4 Bantam — Consolidated Technical Report, an editorial research compilation that carries a confidence legend distinguishing verified, secondary and open material. It presents a program chronology, specifications, aerodynamic findings drawn from NACA Research Memoranda confirmed on NTRS (A50A04, A50D27, A50I01, A51H09, L53G06, H54G16, H54K03), a pilot roster and airframe dispositions, and a discrepancy register of unsupported claims found in other modern summaries. The report is not counted as a period manual.

Format and Delivery

Instant digital download. Documents are delivered as organized PDFs grouped by document type, suitable for reading and printing on desktop, tablet and mobile. Files arrive as compressed RAR/ZIP archives; use a free extractor such as WinRAR or 7-Zip on Windows or The Unarchiver on Mac, and the files open as standard PDFs after extraction.

Historical reference notice

This collection includes maintenance-sensitive overhaul and service documentation and is intended for aviation history, research, restoration and archival study. It is not current approved airworthiness, flight or maintenance data, and it is not an operating or maintenance authorization. Maintenance of active aircraft requires current revision-controlled data from the applicable Type Certificate holder or authorized source; consult FAA 14 CFR §43.13 and applicable EASA continuing-airworthiness requirements and current official guidance before relying on any document for an aircraft or engine. Trade names and designations are the property of their respective owners; no affiliation or endorsement is implied. This digital compilation, structure, indexing and presentation are © Sicuro Publishing.

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