Actually the Me109 wing scoop looks something like what I
am proposing :)

 Similar in some ways which is why I mentioned it. The 109 had less 
Hp than the Spitfire especially in the later versions. the split 
flap wasn't used in climb or level flight, there is a small cowl 
flap at the rear of the duct in front of the flap.
You are correct that the chin scoop was used for an oil cooler 
and also for intake air. There wasn't an intercooler until it 
was almost all over. There were only a few made. Bill Jepson

The split flap could be used in climb as it went both up and down.

The intake air was taken in by the foot ball shaped scoop you see on the
side of the cowl. Same as a P38.

BTW The water to air intercooler on the P51 Merlin was one of its big advantages
in HP. It was an entirely separate liquid cooling system with its own
pump and dedicated heat exchanger located in the main rad duct.

BTW here is Hoerner's evaluation of the net thrust claims for the
P51 type cooling systems.

Paul Lamar
 
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