A BE36 Instructor took the aircraft from his Trainee on short final because of a runway misalignment during a single engine approach. The landing gear warning horn was disregarded earlier and in the confusion of the trainee's approach difficulty the gear was not lowered before landing.

Narrative

We were practicing simulated engine failure and forced landing over the airport. The gear up warning was on all the time as soon as I reduced the power to idle. Because the wind was drifting the airplane towards the runway and the airspeed was too high just before base turn; I knew that if he kept his present airspeed the aircraft will overshoot the final. As we started the base turn; I instructed the trainee to reduce the airspeed and set the flaps to approach. Soon after that I told the trainee to set the flaps to landing position. But the aircraft overshot the final. The trainee tried to make a correction; which was too big. I took over the control and corrected the drift. It was over the numbers when the drift was corrected so I decided to hold on to the controls and land the aircraft. I was concentrating so much on aligning the aircraft that I did not hear the gear warning horn after the base turn and had no idea that the gear was up. The aircraft landed gear up and then I heard the horn again.