Inspired by building a new drone, I got lost in curiosity. What if I have a fixed length of rotor blades and a target amount of lift I want to, well, lift. How do you calculate the number of blades?
I have read a lot about disk loading and was intrigued by this answer (https://aviation.stackexchange.com/a/32252/44213) which found a correlation between diskloading and amount of blades (or lift per blade). It made me wonder; is it actually possible to calculate the number of blades? If it matters (and I guess it does) I want to use a naca0012 airfoil.
Searching around I did find the relation between the number of blades and decreasing efficiency/lift per blade when you add a blade. Also the fact that is would be easier to lengthen the blades is something I found. But if lengthening is not an option, how can you actually calculate this? And, to complete the question disturbing me, what effect does a second disk (like the chinook) have on these calculations?
Any help is much appreciated. Any links will be read thoroughly.