Helicopter advance ratio calculator
Advance ratio is a nondimensional measure of the flow speed relative to a rotor, within the plane of rotation.
It's defined as the ratio of the inplane flow speed \(V_{IP}\) to the rotor tip speed \(\Omega R\).
Description
This calculator estimates the advance ratio \(\mu \) of a helicopter main rotor in level flight.
Equations
The following equation is used to estimate the advance ratio.
It assumes the flow speed in the plane of the rotor is \( V \cos (\gamma \theta )\).
\[ \mu = \frac{V\cos ( \gamma \theta )}{\Omega R} \]
Many symbols are defined in
Helicopter Abbreviations and Symbols.
In addition, we use the following symbols here.
\(\gamma \) 
main rotor forward tilt 
