Fastest Piston Engined Aircraft of WW2?

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446 fast enough to make as one of the fastest
No - it was up there but there were several that were faster and if you read this thread you'll see that. And you also have to consider the model and when it saw action.
 
Well if you read all the way through you'll find...

P-47N 460
P-51H 487
Spitfire F Mk 24 454
Ta 154H-1 472
Do 335 474
F7F - 460
Spiteful F Mk 16 494

There's a few more...
I did know a Spiteful went that fast, but it was the Spiteful XVI, with a Griffon 101 with a three speed supercharger. Most Spitefuls and Seafangs were rated at 475mph. Could 150 octane fuel be involved?

I would guess that with the exception of the Spitfire F24, all of these aircraft are running on 150 octane fuel and/or methanol/water injection.
 
I would guess that with the exception of the Spitfire F24, all of these aircraft are running on 150 octane fuel and/or methanol/water injection.

Spitfire did not have ADI. Nor did Spiteful.

Germans did not have 150 grade fuel.

The Ta 152H and Do 335 used nitrous oxide to provide additional boost above the critical altitude of the engine, and that is where the high speed was achieved.
 

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