[akdavis]

The second one happens during takeoff on both aircrafts,especially the MiG-15/17,100% RPM,takeoff flaps,no trim,full tank,and when I pull back the stick to rotate at a speed below 200km/h,the aircraft never responses,and the nosewheel never lifts,when the speed reach 200km/h,at that exact moment ,even without any control input,the plane suddenly lifts its nose and bounce into the airautomaticly.If I pull the stick at that point,the plane stalls(sudden drop of wingtips).

Sabre will even do this when loaded with bombs. Pretty amazing.