xenial (1) ao-ejection.1.gz

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)