One of the very interesting things about it is it was mechanically
turbocharged to coin a phrase.

 > Paul Lamar

Actually, the word you are looking for is "supercharged."

"Turbocharger" is a contraction of "turbine-supercharger," meaning a
supercharger that has no mechanical drive.
Keith

No that is the correct term. I coined it.
The RR supercharger is driven by an expansion device. Namely
the small Wankel engine above it. Superchargers are normally
driven by gearing of some sort. In this case the supercharger
is partially driven by the waste energy in the exhaust,
much like a turbo charger. In effect it is also a turbo compound.

Paul Lamar ...No rotor no motor.

If it runs on direct mechanical power, in any way (including an
auxiliary engine or motor), it's a supercharger.

If it's powered solely by the flow of gas or fluid with no direct
mechanical drive, it's a turbine-supercharger ("turbocharger").

These are the standard definitions, and I don't see any room to add a
third.  ;)

Keith

What if it is driven by both? If you don't like "mechanically
turbocharged" What are your suggestions?

Paul Lamar ...No rotor no motor.

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