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The OA-1K Skyraider II has something very strange on its nose

The Skyraider II is the first US Air Force plane since the Vietnam War to have a propeller instead of a jet engine—but there are good reasons for it.

Here's How Planes Can Fire Bullets Through Propellers Without Destroying Them

Dutch engineer Anthony Fokker custom-built a single-seat monoplane, featuring a fully functional synchronization gear that had the propeller shoot the gun.