Project SQUID was a United States defense effort post-WWII effort to develop and improve pulsejet and rocket engines, run by the Office of Naval Research.[1]

It was started by discovery of the German Argus As 014 pulsejet used on the V1 buzzbomb, which was reverse-engineered as the Republic Ford JB-2, the first American cruise missile. It produced extensive research in the areas of computational flow dynamics[2], and was used to improve the design of the experimental Fairchild XH-26 Jeep Jet, which use pulsejets on the rotor tips instead of a central engine. The research led to development of pulse detonation engines, which have been suggested as the engines powering the postulated Aurora spyplane.

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• Developments in high-speed-vehicle propulsion systems: S. N. B. Murphy, E. T. Curran
• Project SQUID: Compressible Flow through Reed Valves for Pulse Jet Engines: Torda, Paul ; Villalba, I. P. ; Brick, J. H.