flyoz, I have to disagree with your theory that turning the switch off if you get into tall grass or scrub is "desirable". If the engine were still running when you entered the scrub/grass, then when the power is turned off the engine would go to full speed and you would have a very poor flying free flight airplane...no working RX, servos moving the control surface to who knows where, and of course that full throttle running engine. Look quick as it will be a short and exciting free flight. But then, I was the one who "reasoned" that you might hit a bird with a model airplane and still keep flying.