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I calculated that I needed a total torque of 1629.06N*m to go from 100 to 300rpm in 2 seconds (the amount of time isn't set in stone) but I've been stuck on the fluids aspect of this problem for a couple days now. I'm sure I'm making this harder than it needs to be by thinking so long on it. I'm just not confident in my assumptions.

All I want is an equation I can use to calculate the tangential force acting on the blade due to the flow of air from a tank at some pressure and volume through some pipe and out a 90 degree nozzle.

I'd very much appreciate your help and advice.