wmaxt
Staff Sergeant
RG_Lunatic said:wmaxt said:RG_Lunatic said:wmaxt said:the lancaster kicks ass said:i think that in terms of performance however the P-51 was the best??
In the words of Art Heiden who flew both the P-51 and the P-38 in combat " There's nothing a P-51 can do that a P-38L can't do better".
The P-38L flew further, climed 30% faster, flew higher, carried more, flew marginly faster and turned better. The P-38L also was more complicated to fly and cost more, for an average pilot the P-51 was easier to fly.
1) Cruise at over 360 mph.
2) See the enemy first.
The P-51 was faster than the P-38, even the P-38L.
=S=
Lunatic
The P-51D was rated at 437 at optimum altitude, the P-38L could do 443 at it optimum altitude a small difference and not decisive in any case but it was there. I hate to admit it but a 5 mph speed difference could be due to waxing, poor maintenance or in the case of the Merlin worn cams of malfunctioning turbos.
As for seeing the enemy first I have to grant you there is more plane to look around on the P-38.
Well, this is a problem that commonly occures when you mix sources. You're using the Lockheed "best performance" figure for the P-38L against the USAAF's published top speed figure for the P-51D. To be fair you have to compare same against same. The USAAF top speed figure for the P-38L is 414 mph @ ~25,000 feet, where the P-51's top speed figure is 437 mph @ ~25,000 feet.
The P-51D was about 3 mph slower than the P-51B, which has a USAAF published top speed of 440 mph. However, using the North American top speed figure changes the picture dramatically:
Report: NA-5798
Title: "Flight Test Performance for the P-51B-1
Date: January, 1944
Test Weight: 8,460 lbs
High Speed: 453 mph true airspeed at 28,800 feet at 67" HG and 1298 HP,
war emergency power, high blower, critical altitude.
So the P-51D should be about 450 mph, maybe a mph or two less because of the change in critical altitude from 28,800 to 25,600 feet.
This demonstrates the serious problem with comparing figures from different sources.
But again, the real issue is cruise speed. The P-51 could cruise in full auto-lean at speeds up to 395 mph (363 mph was a common fast cruise setting), which is more than 100 mph faster than the P-38 cruise.
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Lunatic
What load and trim was the test? Were there any modifications? This aircraft was also almost 3,000lbs less than normal max at 11,200lbs so this plane had min load that can add 10-12mph all by itself.
Mixed sources may be a problem however the Lockheed source also compares it with a P-51D which shows the normaly published speed of 437 for the P-51D as well as the 443 of the P-38L on identicaly set up aircraft with simulated amo load and half fuel.
The 414 of the AAF posted number is METO not a fair comparison. The P-38L in equal trim is if not faster as shown still right there (indavidual planes could vary as much as 10mph).
Should be isn't data. But the premis is logical.
As to cruise at higher speeds there is no reason to expect a signifigant difference in the two, since the P-38 is actualy more efficent at optimum cruise and other performance figures being as close as they are. Not having commonly published numbers does not mean not done or not possible. More data is needed here.