/usr/bin/ao-ejection is in altos 1.6-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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void main () {
real R = 22.16 * 12; /* in lbf / lbm (gas constant for ffff powder */
real T = 3307; /* combustion temperature for BP */
real d_mm; /* diameter(mm) */
real l_mm; /* length(mm) */
real f_N; /* force(N) */
real f_lb;
real A_mm²; /* area of bulkhead (mm²) */
real A_in²;
real V_mm³; /* free volume (mm³) */
real V_in³;
real M_lb; /* mass of BP in lb */
real M_g;
real P_Nmm²; /* pressure (N/mm²) */
real P_lbin²; /* pressure (psi) */
if (dim(argv) != 4) {
File::fprintf(stderr,
"usage: %s diameter(mm) length(mm) force(N)\n",
argv[0]);
exit(1);
}
d_mm = string_to_real(argv[1]);
l_mm = string_to_real(argv[2]);
f_N = string_to_real(argv[3]);
f_lb = f_N * 0.22480894;
A_mm² = pi * (d_mm/2) ** 2;
V_mm³ = A_mm² * l_mm;
A_in² = A_mm² / (25.4**2);
V_in³ = V_mm³ / (25.4**3);
P_Nmm² = f_N / A_mm²;
P_lbin² = P_Nmm² * 0.22480894 * (25.4 ** 2);
M_lb = (P_lbin² * V_in³) / (R * T);
M_g = M_lb * 453.59237;
printf ("Input parameters:\n");
printf (" Diameter: %.1g (mm) %.3g (in)\n",
d_mm, d_mm / 25.4);
printf (" Length: %.1g (mm) %.3g (in)\n",
l_mm, l_mm / 25.4);
printf (" Force: %.1g (N) %.3g (lb)\n",
f_N, f_lb);
printf ("Chamber values:\n");
printf (" Area: %.0f (mm²) %.3g (in²)\n",
A_mm², A_in²);
printf (" Volume: %.0f (mm³) %.3g (in³)\n",
V_mm³, V_in³);
printf (" Pressure: %.2g (lb/in²) %.5g (N/mm²)\n",
P_lbin², P_Nmm²);
printf ("Results:\n");
printf (" FFFF powder: %.3g (g)\n", M_g);
}
main();
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