I know someone, who's perfect to answer all these question. My grandpa served in China Air Force from 1931-1949, ended up as CO of Nanchang AB. His whole history is engineer readying and repairing AC, especially during China-Japan War and WWII.
But he passed away years ago, and everything that has to do with the air force history has been burned or destroyed when the communists took over. No photo, no memoir, only a letter of "confession". The only legacy is an ancient metal model of P-40.
I have bought a book on the AC readiness years ago, written by the PLAAF Academy or so and published by Chinese Defense Industry. There were quite a lot of function and formula describing this issue. However, I don't dare to present these pages.
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