New to this version of IL-2, but played the original in 2001 and 1946 a few years after. Just started BoK on Thursday with the P-39 just getting a feel for the plane, tried a few landings which were pretty good and a few small dogfights. So far,VERY impressed. So I want to check out one of the tailgraggers, Yak 7b, and see if I can land it successfully. I can, but the issue is takeoff. Using "normal" flight, not expert, on the runway, throttle up, get the plane moving straight with some left rudder, slowly throttle her up, tail wheel comes off the ground, gaining speed and getting a little excited to rotate, then the engine just totally dies. Happens at about 75 mph and it seems to be caused by an automatic change (normal mode) to the mixture. The second it changes the mixture, to 75% I believe, the engine just stops. This mostly happens on dirt runways. I tried a bunch of times with the exact same result. Tried to search for some info online, and not much came up. I did read about overheating issues with both oil and water, and then tried expert mode, trying to warm the engine before take off then opening the radiators with several different mixture levels because the engine was dying every single time, and nothing, engine dies mid takeoff run. Btw, these are during single flight scenarios, airfield is mid map on the west coast. Great area! Anyway, I was getting a little ticked and decided to do a few dogfights, thinking I'd start in the air and not deal with taking off. Tried a different area and I must have erred as I was on a concrete runway with two other planes in my flight. So, throttle up, etc etc...., and lo and behold the plane accelerates passed 80 and it's looking good, keeps going and boom, I'm off the ground! Had a great battle too. Did another one, no problem. This morning I'm thinking all is good on the concrete runway, trying a flight, mid takeoff roll, the engine dies. I'm beyond puzzled, and beyond ticked. Tried it again, maybe slightly slower advancing the throttle, maybe, and no issue with the engine. Like I just said, I am totally puzzled. Anyone familiar with this? Frustration is an understatement, especially because I think I really like this plane! Seems to have a great gun and flies very stable. I would really appreciate any help with this issue.