This thread is about diving acceleration, not level flying.
"B" point is just fw190a8 's max. level ,only 648km/h TAS, while P51B could reach 715km/h (444mph)@20000ft, and 670km/h for P47D.
It's very very easy for P51P47 dive to "C" point(777km/h TAS) which is only 100-60km/h higher than there max. level flght. At "C" point fw190a8 prop. efficiency only 36%!
The max. permitted dive speed @20000ft for Tempest is 450 mph IAS=1014 km/h TAS, P47P51 are probably the same. Sir, when diving at 850km/h TAS@20000ft, can you imagine how frustrated fw190A8 is?
I think I've expressed enough my opinion. Let's read a paragragh from wiki to understand why the author wrote "energy-saving" dive. "energy saving" means P47's opponents bleeding their energy heavily when fighting against P47 at high TAS. I wish Daidalos team could make il2 perfect by giving us REAL thunderbolt , Mustang, and Tempest.
Quote:
The P-47's initial success in combat was primarily due to tactics, using rolls (the P-47 had an excellent roll rate) and energy-saving dive and zoom climbs from high altitude to outmaneuver German fighters. Both the Bf 109 and Fw 190 could, like the Spitfire, out-turn and out-climb the early model P-47s at low altitude, although at altitudes above 15,000*ft, the P-47 could turn inside both the Bf 109 and Fw 190. Once paddle blade propellers were added to the P-47 in early 1944, climb performance improved significantly,[33] enabling the P-47 to match the climb performance of any German fighter at all altitudes[citation needed]. While both German fighters could break hard downwards, and leave all models of the Spitfire trailing,[29] no German piston-engined aircraft could out-dive the Thunderbolt. In a "bounce," with their rapid acceleration downhill coupled with the pulverizing effect of eight .50s, these aircraft were deadly.[34] The Thunderbolt was the fastest-diving American aircraft of the war—it could reach speeds of 550*mph (480*kn, 885*km/h). Major Robert S. "Bob" Johnson described the experience of diving the big fighter by writing, "the Thunderbolt 'howled' and ran for the earth".[35] Some P-47 pilots claimed to have broken the sound barrier, but later research revealed that because of the pressure buildup inside the pitot tube at high speeds, airspeed readings became unpredictably exaggerated. But German pilots gradually learned to avoid diving away from a Thunderbolt. Kurt Bühligen, a high-scoring German fighter ace with 112 victories, recalled:
"The P-47 was very heavy, too heavy for some maneuvers. We would see it coming from behind, and pull up fast and the P-47 couldn’t follow and we came around and got on its tail in this way".[36]
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