Originally Posted by
FlyingRon
The LRI is NOT an angle of attack indicator, although just like your wing it is affected by it.
I find the documentation on the popular one somewhat misleading.
Stall does not result in all lift going away. It's just where increasing further AOA causes a decrease in lift. The AOA vs. lift slopes are pretty symmetrical around the stall point.
That's not to say the LRI doesn't give a useful reading. It tells you a number most people (incorrectly) equate to stall which is insufficient lift to maintain flight.