Question about "three speed and three-stage superchargers"

[Vicvega]

P-40 was not outfitted with a turbo.



I'd agree with the notion that there was no Kasei outfitted with a 2-speed S/c drive, not even these for any J2M version.



Got a link?

The Aircraft Engines of World War II | Defense Media Network

A review of the development of aircraft engines among the major combatants before and during World War II, including radial, inline, and jet engines.

www.defensemedianetwork.com