UK Army bent most of their Gazelles by throwing them at the ground to teach people what happened when the donkey stoppped - trouble being, the donkey hardly ever stopped (single digit occurences in 30 years of Ops, despite mostly being less than 100' AGL all your life) so the accident stats for single engined ops were completey skewed by training for the event that never happened. To balance the down side of all the engine off training, at least you always knew you could get it on the ground safely "sans moteur", a far more likely occurence when you migrated to the twin engined fury of the mighty Westland oil slick (Lynx). Now there's an aircraft where you really want to know where the the avoid curve is.