Gross vs. Net takeoff performance
I'm fairly new with these two terms so forgive me if my question seems a little basic.
It is my understanding that in the event of an engine failure at V1 an aircraft is required to meet the gross climb gradients of positive rate, then 2.4%, and finally 1.2% ( if twin engine), and 0.5%, 3.0%, and finally 1.7% (if 4 engine). The Net flight path would then be 0.8% less (2 engine) or 1.0% less (4 engine). The net flight path gives you 35' clearance within 300' horiz either side of center. Hear is where I get a little lost.
If an aircraft is required to meet the Gross climb gradients One engine inop. then when would the Net climb gradient ever be used?
If net climb gradient is 0.8% less than Gross and the engine failure happened just after V1 it would seem the Aircraft would never make it through the first segment. As all that is required is positive rate.
I've read another thread on take-off performance but it didn't seem to clear this up for me. Any help would be appreciated.