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Rail Exit Velocity Calculator
Calculate the speed your rocket leaves the launch rail and whether it will be stable in current wind conditions.
🏘 Select motor(s) from the database
— or enter average thrust manually (less accurate — selecting a motor above uses the actual thrust curve) —
N
°
0° = vertical · Angling reduces gravity load on the rail
Rail exit velocity
---m/s
Thrust-to-weight ratio
---:1
Minimum safe velocity
---m/s
Simplified calculation assuming constant thrust and neglecting aerodynamic drag on the rail. Safe minimum is generally 15 m/s (50 ft/s) in calm conditions, or 4× the ground wind speed in windy conditions.