mirror of
https://github.com/deater/dos33fsprogs.git
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87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
#include <stdio.h>
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#include <math.h>
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/* http://wiki.kerbalspaceprogram.com/wiki/Tutorial:Advanced_Rocket_Design */
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/* Also, high school physics (thanks Mr. Brennen) */
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/* TODO: want 2d-vectors at least */
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int main(int argc, char **argv) {
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double capsule_mass=1.0;
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double engine_isp=270.0; /* s */
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double engine_mass=1.5; /* tons */
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double engine_thrust=168.0; /* kN */
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double fuel_flow_rate;
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double tank_mass=0.5; /* tons */
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double fuel_mass=4.0; /* tons */
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double gravity=9.8; /* m/s^2 */
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double rocket_velocity=0.0; /* m/s */
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double rocket_acceleration=0.0; /* m/s^2 */
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double rocket_altitude=0.0; /* m */
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double deltav,twr;
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double total_mass,empty_mass;
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double time=0.0; /* s */
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total_mass=engine_mass+tank_mass+fuel_mass+capsule_mass;
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empty_mass=total_mass-fuel_mass;
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deltav=engine_isp*gravity*log(total_mass/empty_mass);
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twr=engine_thrust/(total_mass*gravity);
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fuel_flow_rate=(engine_thrust)/(engine_isp*gravity);
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printf("DeltaV=%lf m/s\n",deltav);
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printf("Thrust/weight=%lf\n",twr);
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printf("Fuel flow rate=%lf, time=%lfs\n",
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fuel_flow_rate,fuel_mass/fuel_flow_rate);
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for(time=0.0;time<500.0;time++) {
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printf("Time: %lf\n",time);
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printf("\tFuel left: %lf\n",fuel_mass);
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if (fuel_mass<0.1) {
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fuel_mass=0.0;
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rocket_acceleration=-gravity;
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rocket_velocity=rocket_velocity+rocket_acceleration*1.0;
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rocket_altitude=rocket_altitude+
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(rocket_velocity*1.0)+
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0.5*rocket_acceleration+1.0*1.0;
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if (rocket_altitude<0.0) {
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printf("CRASH!\n");
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break;
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}
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}
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else {
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rocket_acceleration=(engine_thrust/total_mass)-gravity;
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rocket_velocity=rocket_velocity+rocket_acceleration*1.0;
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rocket_altitude=rocket_altitude+
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(rocket_velocity*1.0)+
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0.5*rocket_acceleration+1.0*1.0;
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fuel_mass=fuel_mass-fuel_flow_rate;
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total_mass=engine_mass+tank_mass+fuel_mass+capsule_mass;
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}
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printf("\tRocket acceleration: %lf g\n",rocket_acceleration/gravity);
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printf("\tRocket velocity: %lf m/s\n",rocket_velocity);
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printf("\tRocket altitude: %lf m\n",rocket_altitude);
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}
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return 0;
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}
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/* Notes */
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/* Once altitude above 100m stop drawing ground */
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/* Once above 20k no more drag? */
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/* Once above 2100m/s sideways, orbit? */
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/* Once above 40k draw stars? */
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/* Kerbal neutral 0-1G, smiles 1-2G, frowns > 2G or -velocity? */
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