ao-ejection - Compute rocket ejection charges

       Keith Packard

                                                   ao-ejection                                    AO-EJECTION(1)

ao-ejection  computes  the  amount  of  black  powder necessary to generate the desired force to separate
       sections of a rocket airframe. It assumes a cylindrical airspace covered by a circular cap. With that and
       the force to be exerted on the cap, ao-ejection can  compute  the  necessary  pressure  rise  within  the
       chamber, the volume of gas necessary and finally the mass of BP to generate the gas.

            $ ao-ejection 54 300 500
            Input parameters:
                Diameter: 54.0 (mm) 2.126 (in)
                Length: 300.0 (mm) 11.811 (in)
                Force: 500.0 (N) 112.404 (lb)
            Chamber values:
                Area: 2290 (mm²) 3.550 (in²)
                Volume: 687066 (mm³) 41.927 (in³)
                Pressure: 31.66 (lb/in²) 0.21832 (N/mm²)
            Results:
                FFFF powder: 0.685 (g)

       This  demonstrates  that a 54mm airframe with a 300mm chamber requires .685g of FFFF BP to generate 112lb
       of force on the end of the chamber. This is usually sufficient to sever two 2x56 nylon screws.

       ao-ejection - Compute rocket ejection charges

ao-ejectiondiameter(mm)length(mm)force(N)