Aero Lab

Three live calculators: stall speed through the standard atmosphere, short-period stability eigenvalues, and helicopter hover power.

Stall speed through the atmosphere

Short-period stability

Fixed (illustrative): Z_α/V = −1.0 s⁻¹, M_α̇ = −0.3 s⁻¹.

Helicopter hover power

\rho=\frac{p}{RT},\qquad V_s=\sqrt{\frac{2W}{\rho S C_{L,\max}}}

\lambda^2-(Z_\alpha/V+M_q+M_{\dot\alpha})\lambda+(Z_\alpha M_q/V-M_\alpha)=0

v_i=\sqrt{\frac{T}{2\rho A}},\qquad P=\frac{T v_i}{FM}

Generic, illustrative values only. Same formulas as the math page: ISA 1976 to 20 km, L = ½ρV²SC_L, the 2-state short-period model, and actuator-disk momentum theory.

Learn the math behind each number