These are the three important models of F4U pirate fighter family.1. F4u-1d: the first service model of pirate fighter. Unfortunately, it was not selected as a carrier based aircraft due to takeoff and landing problems. But it is still a good fighter, using a three blade propeller.2. F4u-4: one of the strongest modified models of pirate fighter. The takeoff and landing problem has been solved. With a more powerful engine and four blade propeller. Two auxiliary fuel tanks are equipped to increase the range3. Au-1 pirate attack aircraft: the attack aircraft modified on the basis of F4U weakens the engine supercharger because the combat altitude is reduced. Two 500kg bombs and six rockets were mounted. Because he served in the Korean War, he could not compete with jet fighters. Therefore, the combat performance is not satisfactory, but at least it has achieved good results, which is suitable for attacking truck supply teams and air defense fire points.??