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hello Kari
I happened to read an article in an old AM (3/02) and it's database is on LaGG-3 and there is a reprint of an article originally published in the technical magazine Aircraft Engineering in Oct. 1943, based on reports from Sweden on the trials of the trio of LaGG-3s captured and tested by Finns. So, not the best possible source (maybe one can find the original evaluation report from Sota-arkisto). But even if there is much info on different systems, for. ex. one learns that M-105P had 3 valves per cylinder and 6 carburettors, pressure type and the use of cooled and filtered exhaust gases to reduce fire risk is descrbted, there is no mention of an Alpha-sensor in exhaust of Klimov.
Jukka, You asked on one board the effect of radiator flap on P-51s max speed. I have no answer on that but in early LaGG-3s the effect of its radiator flap, which effects surely are nearer of that of P-51's flap than those of Bf 109G's, was appr. 14km/t, that's from Gordon's and Khazanov's book, which You probably had but maybe You have missed that piece of info.
HTH
Juha
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