Helicopter calibrated airspeed calculatorDescriptionThis calculator estimates the calibrated airspeed (KCAS) of a helicopter. Calibrated airspeed is indicated airspeed after correcting for local flow deviations associated with the aircraft. For example, interference velocities generated by the presence of the fuselage or rotors may bias indicated airspeed, but are removed from calibrated airspeed. Like indicated airspeed, calibrated airspeed differs from true airspeed when air pressure or temperature are not at sea level standard conditions. EquationsThe following equations are used to estimate calibrated airspeed. \[ m_s = KTAS/c_0 \] \[ T_R = T / T_0 \] \[ P_R = ( \frac{T_0 + \delta P_A}{T_0} )^{5.2559} \] \[ KCAS = c_0\sqrt{5 ((P_R((1+\frac{KTAS^2}{5T_R c_0^2})^{7/2}-1) + 1)^{2/7} - 1)} \]Many symbols are defined in Helicopter Abbreviations and Symbols. In addition, we use the following symbols here.
|