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Stall Speed Estimator

Compute stall speed and approach margin from required lift, density, reference area, and CLmax with a speed tape.

visual calculatorAerodynamics & External Flow

Read the flow shape before trusting the number.

This page turns a CFD setup into regime, scale, and dominant-effect cues. Adjust the calculator below and compare the moving graphic with the computed result.

01
input scale
02
model
03
check
stall speedliftCLmaxvisualization
formula
KaTeX rendered
V_s = sqrt(2 W n / (rho S C_Lmax))\begin{aligned}\text{V\_s = sqrt(2 W n / (rho S C\_Lmax))}\end{aligned}
ASCII sourceV_s = sqrt(2 W n / (rho S C_Lmax))
speed tapestall x 1.3 approach marker
stall
margin
stall speed (m/s)
24.744
1.3 Vs (m/s)
32.167
q at stall (Pa)
375.000
equiv bank angle
0.00 deg

For hydrofoils, wings, UAVs, and wind-tunnel models, keep the reference area and C_Lmax convention consistent.

stall speedliftCLmaxvisualization