Why has the yak 1 and lagg 3 in bos the WK-105PF engine? Did yak 1 and the lagg 3 not the Klimow WK-105P?
I know you amended it to say Yak-1 instead of LaGG-3 later but FYI sources say the LaGG-3 Series 29 has the M-105PF engine as well (one of many examples: http://wio.ru/tacftr/lag.htm).By mid 1942 its the standard engine going into the Yak and LaGG series fighters. Definitely not a balancing thing.
Yak7B was about 100-200kg heavier then Yak-1B or Yak-1 with the same engine. So climb rate and turn rate should be worse then Yak-1B. So Yak7B was much more close to Yak-1 with PF engine and Yak1B was better plane for sure
That's what I'm expecting too. That said, 100-200kg isn't a whole lot so its going to be a subtle difference that experienced Yak pilots will surely notice but many are not going to see too much of a difference there. For 200kg a slightly faster diving aircraft with an extra machine gun isn't too bad