The P-47 Thunderbolt, also known as the Republic P-47 Thunderbolt, is a World War II-era fighter aircraft, but there is no such aircraft called the "P-47 Thunderbolt II." The P-47 Thunderbolt was a single-seat, single-engine aircraft primarily used by the United States Army Air Forces.
The P-47 Thunderbolt had different variants, each with its own specifications and performance characteristics. The top speed of the P-47 Thunderbolt varied depending on the specific variant, engine, and altitude. However, the general range of top speeds for different P-47 models was approximately between 400 and 475 miles per hour (644 to 764 kilometers per hour). These speeds were achieved at high altitudes.
For example, the P-47D Thunderbolt, one of the most produced variants, had a top speed of around 433 mph (697 km/h) at 30,000 feet (9,144 meters). The P-47N Thunderbolt, another variant developed towards the end of World War II, had a top speed of approximately 467 mph (752 km/h) at 30,000 feet (9,144 meters).
It's important to note that these speeds are approximate values and can vary based on different factors such as engine modifications, atmospheric conditions, and the weight of the aircraft.