Stall Speed Calculator
Professional Aircraft Stall Speed Calculator for Aviation Engineering
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Aircraft Weight (W)
N
Air Density (ρ)
kg/m³
Wing Area (S)
m²
Maximum Lift Coefficient (CL_max)
dimensionless
Enter aircraft parameters and click Calculate to see results
Calculated Stall Speed
0.00
m/s
0.00
km/h
0.00
knots
Calculation Breakdown
✓ Safety Zone: Maintain airspeed above stall speed during flight operations
Aviation Science & Education
What is Stall Speed?
Stall speed (Vs) is the minimum airspeed at which an aircraft can maintain altitude and controlled flight. Below this speed, aerodynamic lift becomes insufficient to support the aircraft weight, resulting in an aerodynamic stall.
Why Aircraft Stall
An aircraft stalls when the angle of attack exceeds the critical angle, causing boundary layer separation over the wing. This dramatically reduces lift production and increases drag, preventing sustained flight.
Aviation Safety
Understanding stall speed is critical for flight safety. Pilots must maintain airspeed above stall during takeoff, climb, and especially during approach and landing phases when speed is naturally lowest.
Lift & Stall Relationship
Lift force depends on airspeed squared. As speed increases, lift increases. The lift coefficient (CL) peaks at the critical angle, beyond which separation occurs and both lift and stall speed decrease.
Real-World Examples
Boeing 737: ~52 knots | Airbus A380: ~42 knots | Cessna 172: ~36 knots | F-16 Fighter: ~145 knots. Stall speeds vary with weight, altitude, and configuration.
Pilot Training
Stall recognition and recovery are fundamental skills taught during flight training. Pilots learn to identify stall warnings and execute proper recovery procedures to prevent accidents.
Comparison of Aircraft Stall Speeds
| Aircraft Type | Class | Stall Speed (Knots) | Weight (kg) |
|---|---|---|---|
| Cessna 172 | Light Aircraft | 36 | 1,100 |
| Boeing 737 | Commercial | 52 | 10,000 |
| Airbus A380 | Wide-body | 42 | 60,000 |
| Embraer E190 | Regional Jet | 43 | 4,600 |
| Bombardier Q400 | Turboprop | 42 | 2,950 |
| Gulfstream G650 | Business Jet | 90 | 3,000 |
Cessna 172
Class
Light Aircraft
Stall Speed
36 knots
Weight
1,100 kg
Boeing 737
Class
Commercial
Stall Speed
52 knots
Weight
10,000 kg
Airbus A380
Class
Wide-body
Stall Speed
42 knots
Weight
60,000 kg
Embraer E190
Class
Regional Jet
Stall Speed
43 knots
Weight
4,600 kg
Bombardier Q400
Class
Turboprop
Stall Speed
42 knots
Weight
2,950 kg
Gulfstream G650
Class
Business Jet
Stall Speed
90 knots
Weight
3,000 kg
Frequently Asked Questions
How is stall speed affected by aircraft weight?
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Stall speed is directly proportional to the square root of weight. Doubling the aircraft weight increases stall speed by approximately 41% (√2 ≈ 1.414). This is why heavier aircraft require faster landing and takeoff speeds.
Why does altitude affect stall speed?
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Air density decreases with altitude. Lower density reduces aerodynamic lift, requiring higher true airspeed (TAS) to maintain lift. This is why stall speed increases with altitude despite indicated airspeed (IAS) remaining constant.
What is the difference between Vs0 and Vs1?
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Vs0 is stall speed in landing configuration (flaps down, landing gear extended). Vs1 is stall speed in clean configuration. Vs0 is typically lower due to increased wing area and lift coefficient from extended flaps.
Can an aircraft stall at cruise altitude?
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Yes. Altitude increases stall speed due to lower air density. At very high altitudes, the aerodynamic stall speed may approach or exceed the aircraft's maximum speed capability, creating a dangerous flight envelope known as "coffin corner."
How do flaps affect stall speed?
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Extended flaps increase the maximum lift coefficient (CL_max) significantly. This reduces stall speed, allowing shorter takeoff and landing distances. Each flap increment typically reduces stall speed by 3-5%.
What is the stall speed formula derivation?
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The formula derives from the lift equation: L = 0.5 × ρ × V² × S × CL. At stall, Lift equals Weight (L = W). Solving for velocity: Vs = √(2W / (ρ × S × CL_max)) in SI units (m/s).
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