Helicopter inflow ratio calculatorInflow ratio is a non-dimensional measure of the flow speed normal to a rotor. It's defined as the ratio of the normal flow speed \(V_{N}\) to the rotor tip speed \(\Omega R\). DescriptionThis calculator estimates the inflow ratio \(\lambda \) of a helicopter main rotor. EquationsThe following equations are used to estimate the inflow ratio. \[ V_N = V\sin (\gamma - \theta ) + V_U \cos (\gamma - \theta ) + v_i \] \[ \lambda = \frac{V_N }{\Omega R} \]Many symbols are defined in Helicopter Abbreviations and Symbols. In addition, we use the following symbols here.
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