My experience with his work is limited to only WWII birds, as I clearly wrote above. Should his work turn fantastical after 1945 idk, but again am not interested in that period for my research. Claiming him to write 'propaganda' is a stretch. Factually incorrect in some instances maybe (I do not know the performance of jets so I cannot tell), but hardly 'propaganda'. Where is the pushing of politics in this works? He regularly and explicitly states the shortcomings of Soviet aviation in the book I have read: Soviet Air Power in World War II, Yakovlev's piston-Engine Fighters, Lavochkin's piston-engine Fighters, etc.