[akdavis]

Great, so everything is speculative... At this point, the project will happen and I will do more research and base the FM on that. So, don't worry about it. It won't be a P-51 with an F-15 FM and it won't be a made up performance either. It will be as real as it can be, so relax... The only reason I can't give you my sources right now is because I can't find the link. Sorry...

One note on the P-51H and the P-47's since people keep asking why don't I do one of those instead... The P-51H, late P-47D, P-47M, and P-47N are supposed to be in the Mustang Collection.

Edit:

Found another source. This is about the stats for the P-51K-10NT. It was talking about the P-51K-10NT "Second Fiddle" that took 5th in the Thompson Trophy by using a special fuel, but gave the stock statistics for the late P-51K-10.

Type:
P-51K single-seat land based fighter
Powerplant:
One 1,680 hp Packard Merlin V-1650-7 piston engine
Performance:
Maximum speed 442 mph at 24,500 feet;
climb 10 minutes to 20,000 feet;
range (normal) 950 miles
Weights:
7,000 lb.; 9,200 lb. gross
Dimensions:
Span 37 ft.; length 32 ft. 3 in.; height 8 ft. 8 in.

Well, there's combat reports of it going faster, but I guess you wouldn't consider that legit so here's the most statistical proof of performance increase in the late P-51K-10NT.

This climb and speed data is taken from North American testing of the P-51D, which can be seen here:

http://www.wwiiaircraftperformance.org/ ... -chart.jpg
(edit to add: no, I read that wrong. The climb data is just plain wrong.)

During an AAF flight test at Wright Field June 15, 1945, a P-51D-15-NA reached a max speed of 442mph, but at the higher altitude of 26,000'.

http://www.wwiiaircraftperformance.org/ ... -level.jpg