What is wrong with DC3 takeoff ? How to fix and tailwheel lock unlock

thks, but if I want to change parameters, I understand you have to do it in the SDK, not like in FSX where you had all of them inside FSX. Am I correct? Now that I have found this thread I know why my planes act up whenever I am rolling on the ground but are ok once they are airborne.The DC-3 is awful on the runway, for instance.
Peter