advance ratio


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Related to advance ratio: propeller efficiency

advance ratio

n
1. (Aeronautics) the ratio of wind speed along the axis of a rotor or propeller to the speed of the blade tip
2. (Aeronautics) the ratio of forward flight speed to the speed of the rotor tip of a helicopter
References in periodicals archive ?
The complete NPAs to gross advance ratio and net NPAs to net Advance ratio stood at 3.
Steady-state simulations were conducted on both hubs with an inlet velocity of 150 knots, a hub rotational rate of 500rpm and an advance ratio of 0.
The propeller performance, at different combinations of propeller speed (n) and forward speed (U)--using the advance ratio, J = U/nD--can be characterized in terms of thrust coefficient ([C.