Launch Lug Sizing Calculator
Calculate rod/rail exit velocity and minimum guide length for a safe launch. Accounts for thrust, gravity, friction, and wind speed.
Inputs
Results
Exit velocity (m/s)
6.33
Exit velocity (ft/s)20.78
Safe minimum exit (m/s)15
Thrust-to-weight ratio3.06
Net acceleration (G)2.05
Time on guide (s)0.32
Min rod length for safe exit (m)5.61
Recommended Guide3/16" launch rod
How to Use This Calculator
- Enter Rocket mass (kg), Average thrust (N), and Rod/rail length (m).
- Set Wind speed (m/s) and Launch angle from vertical (°).
- Review the Exit velocity (m/s) result.
- Use Exit velocity (ft/s) and Safe minimum exit (m/s) to inform your decision.
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