Event Brief
Grumman ST-21 proposal for a super-F-14 with higher speeds
By The BriefBrief · Sources (1)
Filed: Sep 27, 2026 at 7:03 PM ET
Summary: Grumman pitched the ST-21 in the early 1990s as a new-build or remanufactured F-14 to replace the canceled A-12 Avenger II. The design would replace the Tomcat’s glove vanes with enlarged gloves for improved supersonic handling, add more fuel, and target higher performance including supercruise near Mach 1.3 and Mach 2 speeds with about 1,600 nautical miles of range.
WHO: Grumman
WHAT: Proposed the ST-21 as a new-build or remanufactured F-14 with enlarged glove vanes, improved supersonic handling, and higher speed/range targets.
WHEN: 1991
WHERE: USA
WHY: The Navy sought a way forward after the A-12 Avenger II stealth attack jet was canceled in 1991.
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