MIT AeroAstro Undergrad -- HSRPL Founder
- Mar 13, 2016
- Reaction score
- Los Angeles
Simulating my first large rocket on RasAeroII and am really paying attention to the details. After reading the whole manual, I know to enter takeoff weight, and CG under Flight Performance, double tapping the loaded sustainer motor (single stage). In order to get an accurate sim, I am assuming (hoping) the program subtracts spent propellant weight proportionately to thrust and based off the propellant weight entered into the .eng file in the header. This moves forward the CG, something I need to check the extent of when the CP moves forward past Mach 1. If someone could please let me know if this is the case I would appreciate it. Secondly, does anyone know if RasAeroII enables more detailed component based CG calculations? For example, the nozzle weighs a lot more than the motor forward bulkhead so the CG of the motor itself will move towards the nozzle end during the burn, while the whole rocket's CG will move nose end. Any input's appreciated.