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Variable Discharge Turbine
It's in the lower right.
http://www.dc3dakotahunter.com/blog/...oming-jet-age/
It doesn't state directly what the thrust amounts to, thrust and shaft power being apples and oranges; but the supercharged version of the engine had 3500 horsepower and this configuration with supercharger and turbocharger had 4300.
So, in addition to the Meredith Effect P-51 and FW-190, and the ducted-fan cooling on Zeppelin engine nacelles, there is this. One evolutionary step short of the turbo-prop.
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