I'm trying to use a simulator to learn to land properly. One part that I'm finding really tricky is picking a proper rate of descent. I know I'm supposed to do my best to keep it so I have two red lights and two white lights on the Precision Approach Path Indicator (PAPI), but at the moment I basically am just eyeballing it and adjusting my course whenever the lights aren't right.
I have to assume, though, that for any given airspeed there is a rate of descent I can maintain that will keep me right in the middle of the preferred glide slope for that airport. I just have no idea how to figure it out. Is there an application or formula that is preferred for this? Or is it time to learn Vector Calculus?
PS- I did check this question to see if it related. But that question is about starting the descent from cruise. I'm talking about rate of descent for final. I did also check this answer, but it's about using the PAPI/VASI lights. I'm looking for a formula to figure out the proper rate of descent during final for a given speed.