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The Ford-Philco GAU-7/A was an abortive program initiated by United States Air Force in the late 1960s to develop a new cannon for the proposed F-14 ADC interceptor and replace the M61 Vulcan on the then-upcoming F-15 Eagle. The GAU-7/A was a 25 mm Gatling gun using telescoped ammunition with a combustible case developed by the Brunswick Corporation. It was intended to have greater range and hitting power than the 20 mm Vulcan, while the caseless ammunition would have alleviated the problems of either storing or ejecting spent cartridges, both of which present considerable problems for jet aircraft.

Despite great expenditure, the project and its ammunition proved to be a failure, and it was canceled in 1974. The F-15 therefore retained the M61A1 cannon, as have most U.S. fighter aircraft since 1956.

See also

• GAU-12 Equalizer

References

1. Fisher, Edward B. (1 June 1972). "2.2 GAU-7/A Design, II Computer Simulation Development". Basic design analysis of GAU-7/A telescoped ammunition (Final Report March 71-January 72) (PDF). Air Force Armament Laboratory (Report). Eglin Air Force Base (AFB), Florida, United States of America: Armament Development and Test Center (United States Air Force). pp. 2–3. AFATL-TR-77-107. Archived (PDF) from the original on June 24, 2021.
2. Williams, H.; Gilbert, K. (6 January 1972). Development and Test of Storage and Feed System for GAU-7/A Gun (Final rept. Mar 71-Jan 72) (PDF). Emerson Electronics and Space Division/Defense Technical Information Center (DTIC) (Report). Fort Belvoir, Virginia, United States of America: Emerson Electric Co./United States Department of Defense. pp. 3–71. Archived from the original on August 6, 2020.
3. Davis, Dale M. (1 January 1984). "XIII: GAU-7 Projectiles". Historical Development Summary of Automatic Cannon Caliber Ammunition: 20-30 Millimeter (Final Report: 1952 - 1983) (PDF). Air Force Armament Laboratory (Report). Eglin Air Force Base (AFB), Florida, United States of America: Armament Development and Test Center (United States Air Force). pp. 102–112. Archived (PDF) from the original on May 8, 2021.
4. "Caseless ammunition". NationMaster. {{cite web}}: Missing or empty |url= (help)
5. https://raigap.livejournal.com/247024.html

v t e Firearms using caseless ammunition
Armtech C30R Benelli CB M2 Daisy V/L GAU-7 Gerasimenko VAG-73 GP-25/30/34 Heckler & Koch G11 Ho-301 Kentron IFA Lightweight Small Arms Technologies Metal Storm RG-6 RGM-40 Scicon IW Textron CT Voere VEC-91

v t e Modern rotary cannons
German Empire 7.92×57mm Fokker-Leimberger
China 7.62×54mm CS/LM12 Hua Qing Minigun Various other 7.62×54mm weapons 12.7×108mm CS/LM5 Various other 12.7×108mm rotary guns 14.5×114mm CS/LM16 Various other 14.5×114mm rotary guns 30×165mm Type 1130 CIWS Type 730 CIWS
Iran 7.62×51mm Akhgar 12.7×108mm Muharram/Nasr 23×115mm Asefeh
Poland 12.7×99mm WLKM
Soviet Union  Russia 7.62x54R Panchenkov Slostin TKB-041 GShG-7.62 12.7×108mm Yak-B 12.7 23×115 mm GSh-6-23 30×165mm GSh-6-30 AO-18
United States .22LR Neal submachine gun Zinsner rotary gun 5.56×45mm NATO PF556 XM214 Microgun XM556 7.62×51mm NATO XM133 Minigun M134 Minigun 12.7×99mm NATO Dillon Aero 503D GAU-6 GAU-19 20×102mm M61 Vulcan M195 M197 XM301 25×137mm GAU-12 Equalizer GAU-22/A 30×113mm XM188 30×173mm GAU-8 Avenger GAU-13/A 37×219mm/35×228mm T250
Indonesia 7.62×51mm NATO Komodo Armament Eli gun

• Multi-barrel machine guns
• Rotary cannon
• Caseless firearms
• Aircraft guns
• 25 mm artillery