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Why P51 was Faster than the BF 109

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Hippycrowe
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Re: Why P51 was Faster than the BF 109

#16 Post by Hippycrowe » Sat Sep 15, 2018 8:07 pm

The P-38 was exceptionally quiet for a fighter, due to its exhaust being muffled by turbo-superchargers.

Found this onine 10 facts about the P38 and it was one of the only a few planes built before and throughout the war.

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Re: Why P51 was Faster than the BF 109

#17 Post by DaleH » Sat Sep 15, 2018 9:26 pm

Awesome Lighting cut-away graphic! Love those kind of pics!

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Re: Why P51 was Faster than the BF 109

#18 Post by SWIHARTMARK » Sat Sep 15, 2018 9:49 pm

The leading edge of the wing had inlets for cooling the turbo-superchargers for the Allisons. Once damaged, not so good. It did lower drag though. The man who designed the SR-71 designed the P-38. They managed to get 1710 HP out of the Allison eventually from a start of 1110 HP. I do remember either reading or watching a video on the P-40 that its Allisons were never supercharged, hence a lower performance. Other planes had a higher priority on those parts.

The cooler on the Mustang was under the fuselage I think. The P-38 did have overheating problems with its cooling system. I do know Doolittle liked to fly a P-38. That was stopped real fast though.

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Re: Why P51 was Faster than the BF 109

#19 Post by SWIHARTMARK » Sat Sep 15, 2018 10:00 pm

I stand corrected, the P-40 did have a supercharger. That's what I get for listening to the History Channel. It does seem the Allison had problems at higher altitude though. The Army liked it for its reliability. Also, the P-40 was high the price of a P-38 and could out turn a ME-109 at low altitude.

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Re: Why P51 was Faster than the BF 109

#20 Post by HectorFuego » Sun Sep 16, 2018 12:14 am

Just stumbled across this video and thought it might be relevant. Kinda helps you appreciate the P51 a little more. Oh, don't play it at full volume.

https://www.youtube.com/watch?v=C6DWBkF7NUI

Hector
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Re: Why P51 was Faster than the BF 109

#21 Post by Tommy Atkins » Sun Sep 16, 2018 11:05 am

It was "blown" but only single-stage unlike the Merlins with the 2-stage units. You can see the side by side comparison with the (Packard) Merlin & the Alison well in these shots.
Allison:
DSCF9946.JPG

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Re: Why P51 was Faster than the BF 109

#22 Post by Tommy Atkins » Sun Sep 16, 2018 11:11 am

DSCF9882.JPG
(Packard) Merlin:

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Re: Why P51 was Faster than the BF 109

#23 Post by Hippycrowe » Sun Sep 16, 2018 11:26 am

Why didn't they put the Merlin in the P38.

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Re: Why P51 was Faster than the BF 109

#24 Post by SWIHARTMARK » Sun Sep 16, 2018 2:42 pm

The Merlin had a two staged turbo-supercharger, while the Allison had a single stage. This meant significant problems with where to put ducting for cooling the contraption. Also, a Mustang is half the cost of a P-38 and had fewer problems with installing it. As such, the US Army Air Corps felt it was more efficient to use the Merlins on P-51's. The P-38's turbo-supercharger problems seem to be epic. I know Lindberg had to show mechanics stuff about the carburetors to get all the MPH they could out of them that contradicted the specs. The Army also felt the P-38 already had enough power with two engines and the Allison was significantly upgraded from its original design.

I've found that increasing horsepower and performance on an aircraft to be a far more complex thing than doing it with a car. The physics are much more demanding.

I did find that P-51s were used in ground attack mode in Korea since they could fly from Japan and do it. Also, loads were available to give away to the ROK.

I'm surprised I found all this stuff right off the internet, which easily surpasses most stuff I see on cable. Before the net, this would be hard to look up this quick if you could even track down the book or magazine it was in.

Best Regards,

Mark

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Re: Why P51 was Faster than the BF 109

#25 Post by Hippycrowe » Sun Sep 16, 2018 7:59 pm

To bad the Vought F4U Corsair didn't get a chance to fight the Germans,the British had them but by the time the British used them for top cover during the Tirpitz raid there were almost no German planes left.

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