Originally Posted by
Magplug
@EwanWhoseArmy... The Dead mans Curve is establshed during test flying of a new type. A couple of test pilots start at say 2000' in the hover and chop the engine just as your instructor on the R22 did. They then enter autorotation and land. At the next attempt they bring the height down by 100' and repeat.... until they scare each other at which point they put an X on the graph and move on to the next part of the test. The Dead-Man's curve for the R22 will look very different to the profile for an AW169. Remember also... In a twin-engined helo the significance of the DMC is much less because you have two engines and the chances of one failing is very slim, the chances of two failing together in normal operation is infintisimal.