In helicopter/rotocraft literature, such as ICAO Annex 14 Volume II (how to design heliports), there's constant references to performance classes. How can I tell what performance class a helicopter is in?
So far the only definition I have found is: in the event of engine failure, Performance Class 1 helicopters should be able to land within the rejected take-off distance available or continue safe flight, while Performance Class 3 will require forced landing. (https://www.casa.gov.au/standard-page/project-os-1124-incorporation-performance-class-concepts-australian-helicopter).
This is hard to apply to helicopters where I only have some basic specifications. Are there any other, easier to use, definitions for performance classes? I'm hoping for something like runway codes for aerodromes, which are derived from landing distances and wing spans of aircraft that use the runway.