IGE
dzeroplus
I concur with the replies above however, I have a question for you. Are you a helicopter "pilot/instructor" as your profile suggests or is your experience on fixed-wing? If you are indeed a helicopter pilot, you shouldn't really need to ask the question about IGE.
My point being that knowldge of IGE/OGE performance for a helicopter is as fundamental, and as important, as knowing that you need to enter autorotation when your engine fails. (single engine!). If you are indeed a qualified helicopter pilot, might I suggest you go back to your flight school and ask for a substantial refund as you clearly haven't been thoroughly taught the essential limited power techniques. If you are a helicopter instructor; well, where do I start.........!
This isn't meant to be a dig at you by the way. However, if you missed IGE, what else didn't you get taught?
J