Interesting how these infernal combustion engines even lasted this long b4 these seminars came to light with the fancy new stuff they have invented.
Wally Mk2,
As another poster says, there is nothing new here, we operated 0-540s etc LOP, low rpm, high boost ( as per the manufacturer's
then data) in the '60s, as did the operators of the big radials actually since the 1940s --- think the Qantas "double daylight" services in the Catalinas.
It just that this knowledge seemed to have been mislaid in Australia for a generation or two, as the ignoratii have gradually taken over pilot training and CASA.
Tootle pip!!
PS: We did operate O/IO-540 well over 3000 hours TBO, the best I remember was 3600 and still going. Having warm air filters as well as cold air was a small factor, but "biggi" was LOP ---- even without the saving on fuel consumed ---- which is rather significant at European prices.