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Black Powder Ejection Charge Calculator
Calculate the amount of FFFFg black powder needed for your rocket's ejection charge based on airframe dimensions and desired pressure.
⚠ Warning: Black powder is dangerous. Always ground test charges at a safe distance. Never hold the rocket during testing.
Charge weight
---g
Bulkhead force
---lbs
Max shear pins (#2 nylon)
---
Bay volume
---in³
Uses the ideal gas law: W = PV/RT where R = 22.16 ft·lbf/(lbm·°R) and T = 3307°R for FFFFg black powder. Results are starting points only — always ground test before flight. Piston systems typically require less BP.