Where did you get THAT screwed-up idea? (the one I colored red)
The F4U was ABSOLUTELY designed for carrier use... if it had not been, then the prototype (and every example built) would not have been equipped with folding wings (powered hydraulically-operated mechanism), a tailhook (a "stinger-type" that retracted forward into the tail in the prototype, often replaced by the spin-chute dispenser for test flights, and by a normal drop-type in the production examples) and catapult bridle attachments - nor would the airframe have been designed for the stresses of arrested landings (aft half of the fuselage), the high sink rate (and hard hit) of arrested shipboard landings (landing gear support structures and wing/fuselage center sections), or the stresses of catapulted take-offs (front-center of the fuselage).
The prototype even had flotation bags in the wings, for emergency water landings (not installed in production aircraft)!