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The A-1 Skyraider used as an ground attack bomber in Viet Nam had a 18-foot diameter propeller. Not sure if this was the largest. This aircraft was designed in WW2 but was too late to see much action.

Sources I have seen show the A-1 was powered by a Curtis Wright 3350 engine producing 2800 horsepower and turning a 13.5 foot (4.11 meters) propeller.

The B-36 bomber was developed as an intercontinental bomber able to take off from the US and bomb Germany. It was planned in the dark days of WWII when it looked like England would fall to the Nazis and there would be no European airfields available to support shorter range bombers. The B-36 had had 6 Pratt and Whitney R-4360 engines producing 3,500 horsepower in pusher mounts. Those engines drove 19 foot propellers (9 foot blades fixed to a 1 foot hub)

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Q: What is the Largest diameter aircraft propeller?
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