If paytonC11 wants to invest a little money in an eCalc.ch login, he can check out different scenarios with more granularity. For example, I fly a SunnySky 2212 kv980 motor on my quad, on 3S, with a 10x4.7 prop. For that combination, eCalc predicts 923 grams of static thrust, pulling 14 amps, with a pitch speed of 38 mph. The prop loading is 470.

If I were to go to 4S, with a 9" prop, a pitch of 6" would give a prop loading of 486, which is pretty close. eCalc predicts 19 amps with 1461 grams of thrust, and a pitch speed of 63 mph. This is a clear performance upgrade from 3S, but I'm pulling 33% more current.

With a 9x5 prop, the loading is 405. eCalc predicts 17 amps, 1289 grams of thrust, pitch speed of 54 mph. Still an increase in current, but only about 20%. Perhaps more than I would expect given that the prop loading is so much lower, though.

If patyonC11 can provide full details of his power system (battery, motor model and kv rating, prop size/pitch, and ESC rating), I will run up some scenarios in eCalc for him, if he wants.