A simple missile simulator which can give you ease setting missile's drag coefficients and propellant parameters.   this tool is easy to use, just fill in/modify the necessary information and click "simulate" button and here you go.         several notes:   1. this simulator may be inaccurate and missiles may perform differently in real game so this is just for your reference only. the simulation is based on level flights only, so you should take gravity and maybe other factors into account.   2. if your missile doesn't have sustainer, just make the sustainer parameters to 0.   3. the cutoff parameter is used so that the simulation will end when the missile's velocity drops down and be smaller than its value. *but* the simulation will not ends until both booster and sustainer periods are finished.   4. initial speed should be set to the velocity of the launching platform, because planes flying at high speed will enlarge the missile's range that's for sure.