Working changed the dynamics of the Yak-52, only to get it. I tried to make sryvnye characteristic Yak-52. Changed a lot, it is very possible that it took, you should check for all maneuvers, I do this now I will not. The engine I have not touched. Only the airframe. Unfortunately, I never flew on the Yak-52, but the documentation that is to understand how it flies is very difficult. We need reviews and recommendations. Use of this dynamics and its modifications, as a basis for other publications (this is easy to understand ), paid and free, others not.