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DAVIDICUS said:It was my understanding as well that such "tweaking" was commonplace.
As to that test, it was 3,600hp! The engine was a Series 57 (the engine that went into the "M" and "N" models) rated for 2,800hp at WEP.
From: http://home.att.net/~historyzone/Seversky-Republic7.html
Right out of the starting gate, the XP-47M was the horse to beat in terms of speed. The XP-47M proved to be nearly as fast as the XP-47J. 488 mph was obtained on at least one flight. The official maximum speed is 470 mph. However, over-boosting the engine could tweak another 15 to 20 mph out of the big fighter. Some may find this next tidbit hard to swallow, however, the test documents still exist.
During durability testing of the C series R-2800 by Republic, it was decided to find out at what manifold pressure and carburetor temperature caused detonation. The technicians at Republic ran the engine at extreme boost pressures that produced 3,600 hp! But wait, it gets even more amazing. They ran it at 3,600 hp for 250 hours, without any failure! This was with common 100 octane avgas. No special fuels were used. Granted, the engines were largely used up, but survived without a single component failure. Try this with Rolls Royce Merlin or Allison V-1710 and see what happens.
Udet said:Plan_D:
You bet the F and G versions of the Bf 109 did represent very significant improvements over every contemporary Spitfire.
Udet said:Both versions could achieve things the E-3 that saw action over England during the Battle of Britain couldn´t.
Udet said:The alleged story of the "critical deterioration" of the manouverability of the Bf 109, especially on the G version, does not hold water when one sees the performance of the G-6s, G-10s and G-14s that shot down both USAAF and RAF fighters in juicy quantities.
Udet said:The Spitfire, in fact, was becoming a true pig by 1943, becoming heavier and heavier and less manouverable.
Udet said:It appears to me there are people clinging desperately to one of the very few -if not the only one- departments where the Spitfire could "outperform" the Bf 109: turning better.
Like if turning better was the sole choice that would assure success for a fighter pilot.
Udet said:Soren has made useful and illustrative arguments on how the edge slats worked on the Bf 109 apparently to no avail.
Udet said:Even if you were correct when affirming the Spitfire could turn better than the Bf 109, there are still many choices left for the German pilot to find its "out" and to cleanly outfly any version of the Spitfire. It is there, in all those choices where the Bf 109 is certainly ahead of the Spitfire.
Udet said:What about just one, the fuel injected DB engines on the Bf 109 against the carbureted Merlins of the Spitfire. Who could handle negative G forces better? Easy and short response: Bf 109.
Udet said:By the way, the Bf 109 E-3 fared much much better during the Battle of Britain -over enemy territory- against both the MkIs -Hurricane and Spitfire- than any version of the Spitfire did over the Channel and France from 1941 to early 1943 against the Bf 109.
Udet said:The Bf 109s and the Butcher Birds of JG 2 and JG 26 shot down Spitfires like flies during such period.
The Spitfire did not show any improvement in its performance against the Luftwaffe until the 8th´s Jugs began assemblying in England in 1943.