Maybe you need to Google some, Pooch before you criticize me.
You mention the P-47? Read this:
https://nationalinterest.org/blog/b...smash-hitler-and-win-world-war-ii-124091One paragraph on page 1 says:
The bombers were escorted for parts of the missions by U.S. Republic P-47 Thunderbolt fighters, but because of their limited range they could only go as far the western German border.
Another paragraph on page 3 says:
In May 1941, Lt. Col. Bob Olds was given the task of organizing the ferrying of Lend-Lease planes to England. He was an advocate of adding range to all fighter aircraft to increase their ferrying capability. As part of that effort, Lockheed and Republic were asked to increase the range of the P-38 and P-47 fighters they were producing. The modifications of these aircraft, essential for any escort role, were pushed forward to increase their ferrying range, not their combat range. Thus, by chance the P-38s and P-47s delivered to the Eighth Air Force in 1942 (P-38) and 1943 (P-47) were given the capability to extend their combat ranges. With the addition of the tanks, these fighters could escort the bombers farther but still not far enough. They could not go all the way with the bombers on deep strikes into Germany. German fighters would learn to wait and attack the bombers after the escorts had to turn for home.
again, on page 3, another paragraph:
The original Mustang as designed for the British had an underpowered Allison engine. It did not perform well at altitudes above 15,000 feet. It was pure serendipity that a pilot who flew one of the early British versions suggested its performance could be significantly improved by replacing the Allison engine with the same Rolls-Royce Merlin engine that powered the RAF Spitfire. That idea was the stroke of genius that made the Mustang a great high-altitude fighter. It matched or bettered the performance of any German fighter except the Messerschmitt Me-262 jet fighter that entered operations too late to affect the outcome of the air war. But even with external drop tanks, the P-51 did not have the range to escort bombers on their deepest penetrations into German territory. It took further design work to come up with a fix.
In the summer of 1943, North American was told to add another 200 gallons of gas storage to the P-51 design. The head of the company said that it was impossible to accomplish because the landing gear would not hold the additional weight. He was told to try it anyway. He did. Schmued was able to modify the design to provide for an 85-gallon fuselage tank to the rear of the armor plate behind the pilot. With further design modifications, the P-51 with the internal tank plus 108-gallon drop tanks could fly to Poland, a round-trip of 1,700 miles, at speeds approaching 440 miles per hour and at altitudes up to 40,000 feet. It was now the fuel load of the bombers that limited the range of Eighth Air Force strikes.
In this:
https://www.questia.com/library/journal/1G1-191999630/ Maj. Gen, William E. Kepner, of the Eighth Air Force Fighter Command, who wrote, the-p-51-mustang-the-most-important-aircraft-in-history This makes the P-51 the most important aircraft in history. I define most important as (1) the aircraft that provided a major change in the direction of a major war and (2) one that was irreplaceable; no other aircraft could have provided this critical capability at that critical juncture.
Also read this starting at page 36 but if you want to read the first 35 pages too, go ahead, you will learn something. https://digitalcommons.lsu.edu/cgi/viewcontent.cgi?article=2218&context=gradschool_thesesOnly the P51 was able to escort B-17 and RAF bombers deep into Germany and back. The P-47 and the P-38 were good planes but even with their fuel drop tanks, they did not have the range the P-51 had.