Fossil: Spot on about the entry into autorotations. I was out today doing practise EOLs in the R22, with a nice strong easterly and ten gallons... we tried some unexpected simulated engine failures, but these were gentle throttle roll-offs, not at all like the real thing. Robinson strongly advises against throttle chops. Some pilots believe that R22 engines rarely stop dead, so you'd get a bit of warning. But the two most common causes of engine failure, running out of fuel and carb ice, will cause the engine to stop suddenly and completely. The question is, how can this be simulated without counter-productive levels of risk?