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Equation →

T= π/4 x D^2 x (v + Δv/2) x ρ x Δv

D- diameter of propeller

v- velocity of incoming flow

Δv- additional velocity, accelerated by propeller

ρ- density of air (1.225 kg/m^3)

I know that the (v) would be zero initially as the hovercraft is not moving. The problem I have right now is that I do not know how to calculate the additional velocity from a given motor as it Only gives the rpm and not the velocity. If I were to convert rpm to rad/s then to m/s. This would only calculate the velocity of a point mass instead which is not the linear velocity I need. Or am I wrong? Thanks