How to use this calculator
- Enter bank angle. Use the coordinated level-turn bank angle.
- Enter stall speed. Use the relevant 1g stall speed for the aircraft configuration.
- Read load factor. Review the g value for the bank angle.
- Check accelerated stall. Compare the accelerated stall speed against the speed being flown.
How it works
In a coordinated level turn, n = 1 / cos(phi). The accelerated stall estimate is Vs_n = Vs x sqrt(n).
Continue with maneuvering speed, turn radius and stall speed.
Worked example
Verified against the live calculator
A 45 degree bank gives n = 1 / cos(45) = 1.41 g. A 50 kt 1g stall speed becomes about 59.5 kt in that turn.
Frequently asked questions
How is load factor related to bank angle?
For a coordinated level turn, load factor is n = 1 / cos(bank angle).
How does load factor affect stall speed?
Accelerated stall speed is Vs_n = Vs x sqrt(n), so higher bank angle raises stall speed.
Does this apply to climbing or descending turns?
It is a level coordinated-turn approximation. Other flight paths and slips/skids need aircraft-specific analysis.
Why does high bank angle change quickly?
Cosine becomes small at steep bank angles, so load factor and accelerated stall speed rise rapidly.
Method & assumptions
- Assumes a coordinated, constant-speed, level turn.
- Does not model turbulence, pitch inputs, slips/skids, asymmetric loading or aircraft-specific limitations.