Tinpis. Wash your mouth out. Ever tried flying on instruments in the Tiger? That's where the original "under the hood" expression came about because of the canvas hood completely enclosing the student. Impossible to cheat. Line up for take off on all-over grass field - full throttle - keep straight using large turn and skid indicator. If it showed rate four turn you had already ground looped. It was a classic limited panel flying as there was no AH.