NAME

       ao-ejection - Compute rocket ejection charges

SYNOPSIS

       ao-ejection diameter(mm) length(mm) force(N)

DESCRIPTION

       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.

EXAMPLE

            $ 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.

AUTHOR

       Keith Packard

                                                   ao-ejection                                    AO-EJECTION(1)