I needed another challenge so decided to take a crack at a 3D printed Fat Man Atomic Bomb design. This is REALLY short and fat. BT-80 tube for size comparison. Really difficult to figure out the aerodynamics of this since the boxtail is mostly closed with some angled internal fins. Do you all think it is appropriate to use the base drag hack to model this in Open Rocket?
Base drag cone has a diameter of the small diameter of box tail and is 3x the length of that diameter (per Apogee rules of thumb). You can basically delete all the fins and CP stays in about the same place - actually moves back even further.
Without base drag hack moves forward quite a bit (as you would expect)...
Base drag cone has a diameter of the small diameter of box tail and is 3x the length of that diameter (per Apogee rules of thumb). You can basically delete all the fins and CP stays in about the same place - actually moves back even further.
Without base drag hack moves forward quite a bit (as you would expect)...