If both a P-51D and Bf-109G or K fought one on one with one another my guess is that they would be flying less than 360mph each in there fight. Might be wrong but that is my guess. You dont turn as well at higherspeeds as you would at lower ones.
The main thing that made the P-51D so successful was its shear numbers. 5 Bf-109s versus 35 P-51D's. The numbers speak for themselves.
Chris - I don't know if you feel the same way now as you did when you posted this... but the greatest contribution made by the 51s was in the Jan-May, 1944 timeframe when there were an averarge of two groups (or less) of Mustangs to perform Target Penetration and Withdrawal escort for each Bomb Division of 10-13 Bomb Groups... and all or most of LuftReich assests would be concentrated somewhere along that 20-40 mile path in general. Except for Sweeps out in front, the US Fighters were largely spread out and initially 'reactive' to the threat - meaning many of the engagements started with a skillful positioning by LW controllers to a 'blank spot' and provide high cover for the attacking force.
In mosts cases Mustangs were attacking in flights and sections - rarely entire squadrons, much less an entire group.
I should be wrapped up on the research for the 8th soon, but a (perhaps) interesting note is that for the 'Mustang only' groups in the 8th AF - (357th and 339th only flew P-51s) their Awards (not claims, but we know that all awards may not have been valid) of Me 109s shot down were:
421 Me 109s awarded vs 81 Mustangs downed by ALL German fighters (including Fw 190s, Me 262s, etc)
Just making the extreme conservative assumption that all P-51s were shot down by 109s, the air to air ratio is more than 5:1 - so the actual ratios of air to air combat between Mustangs vs Me 109 was far higher than 5:1.
Of the highest scoring groups with more than 170 Me 109 awards were 4th (263), 56th (264), 352nd (320), 355th (173), 357th (326) - only the 56th flew P-47s dominantly. The 8th AF lost a total of 632 fighters during WWII in air to air combat for awards of 2414 Me 109s, 1947 Fw 190s and 124 Me 262s...
Admittedly it will be more interesting when I get the details of all Mustang combat against the 109 in Jan-May, 1944 (actually include 354FG starting in Dec, 1943) as that is the period when the 8th AF FC did Not have numerical superiority near the targets in central to east germany.. actual numerical superiority did not occur until the P-47D's got enough range to help the Mustangs - late in 1944 and then finally converted.
Last comment on my part is that I don't feel that it was clear superiority of a/c as I have said many times before - but doctrine and increasing training edge. The Luftwaffe made the grave mistake of taking aggressiveness away from their pilots by emphasizing 'bombers only' and it cost them dearly Jan-May, 1944.
Regards,
Bill
PS - So far the best source for collecting the data is Kent Miller's works combined with 8th AFVCB, USAF 85 and Olynyk.
Kent names the type from 8th AF VCB and closely correlates but there are differences between the 8th AF VCB which were later REDUCED in USAF 85. My data so far is USAF by total and 8th AF VCB by name/type. If USAF 85 is lower number I use that.
For losses, if there is an 'unknown' cause, but German fighters were in the area - I assign a 'Air' Loss which means even if it was mechanical or weather casue - it goes into my "air to Air" column as a loss. I'm trying to be conservative on behalf of LW.
Cross checking is a bitch and will never be 100% reconciled between the three sources. I have too much time on my hands but eventually I will have a month by month by tpe.