Airspeed is your god and this applies to models also. Unless student pilots, especially those attemting to fly trail draggers, have a competent instructor they more than likely will crash while attempting takeoff. The runway I fly from is 800 ft long and I use about 1/4 of it in a prototypical takeoff. Once the wheels depart from the runway the climb is shallow and straight ahead until I reach my desired altitude. Using this method is akin to flying the real one and tip stalls never come into the scenario. Flying scale models is something you approach with caution and respect.