- #1
orblight
- 1
- 0
Hello, I need help regarding calculating the lift force for a hovercraft. I found an equations online on thrust propulsion.
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
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