Black Powder
Calculator

This calculator will calculate either the amount of BP required for a given PSI figure or the PSI that will be generated for a given amount of BP. If you've ever flown an Impulse Aerospace Machbuster on an Aerotech G55 (or even if you haven't), you may find the MachBuster exercise interesting.


PSI:
Airframe Diameter:
Airframe Length:
Recovery System Volume:
Grams BP:


 

To calculate the BP requirement:
  • Enter the desired PSI figure, depending on airframe diameter, 10 to 18 PSI is typical
  • Enter the airframe diameter in inches
  • Enter the airframe length in inches (make sure you account for nose cone shoulders, bulkheads, etc.)
  • Optional: Enter the volume of the recovery system components in cubic inches
  • Leave the Grams BP field blank
To calculate the PSI produced:
  • Leave the PSI field blank
  • Enter the airframe diameter in inches
  • Enter the airframe length in inches
  • Optional: Enter the volume of the recovery system components in cubic inches
  • Enter the size of the BP charge in grams
I hope you find this calculator useful. The figures derived here are only estimates. Please be sure to gound test your recovery system. You may also find the BP table of use at the range.