Originally posted by Widewing
You may be surprised to learn that at 25,000 feet, the P-47N looks to be the class of the field, capable of 456 mph and shaving several seconds off the Spitfire Mk.IX's best acceleration times (from 200 to 300 TAS) at 20k and 25k. I have yet to test the F4U-4 and Spitfire Mk.XIV, the only two aircraft that may challenge the P-47N at 25k. The P-51s didn't come close.
Here's the data for the best performing non-perked fighters at 20k-25k. I added the perked Spitfire XIV and F4U-4 for comparison. The 109G-14 was added to show how it fares above 20,000 feet (not very good).
I measured acceleration from 200 to 300 mph TAS at 20k and 25k and max speed at 25k in MIL power and WEP. For aircraft with higher critical altitudes, I also show speed at those altitudes.
So, data will be formatted like this: time/time/MIL speed/WEP speed (critical alt speed, where it applies)
P-47N: 29.53/31.91/418 mph/456 mph (476 mph at 30k)
P-51B: 35.19/34.89/419 mph/428 mph (442 mph at 30k)
P-51D: 36.04/43.53/431 mph/441 mph
P-47D-40: 34.33/36.72/416 mph/432 mph (433 mph at 30K)
P-47D-25: 34.69/37.88/416 mph/430 mph (435 mph at 30k)
P-38J: 33.28/38.07/403 mph/420 mph
SpitIX: 33.62/33.35/397 mph/407 mph
109K-4: 28.38/32.33/429 mph/444 mph
109G-14: 32.53/43.53/383 mph/391 mph
190D-9: 38.53/46.22/417 mph/423 mph
SpitXIV: 28.22/31.31/422 mph/443 mph (445 mph at 28k)
F4U-4: 29.15/37.97/431 mph/446 mph
My regards,
Widewing