I've created a Open Rocket file for one of my old rockets so I can do sims on some EX propellant. The first step is to make sure the model and sims are accurate with known commercial loads.
What I found was that the OR sims were all short of actual flights.
I flew a AT K550W to 6400 ft and the sim shows 6150, a 250 ft diff
I flew a CTI K675SK to 7380 ft and the sim shows 7180, a 200 ft diff
I flew a CTI L935W to 9560 ft and the sim shows 9400, a 160 ft diff
The OR file has the physical shape of the rocket correct, including fin profiles. The fins are set to airfoiled and all surfaces are set to Polished, or the sims would be even further away from actual. There are almost no internal components, but a mass object is in place to give the rocket the correct weight and balance.
Anyone have any idea why the sims are off and what can be done to get them to be accurate?
View attachment Grapeshot.ork
What I found was that the OR sims were all short of actual flights.
I flew a AT K550W to 6400 ft and the sim shows 6150, a 250 ft diff
I flew a CTI K675SK to 7380 ft and the sim shows 7180, a 200 ft diff
I flew a CTI L935W to 9560 ft and the sim shows 9400, a 160 ft diff
The OR file has the physical shape of the rocket correct, including fin profiles. The fins are set to airfoiled and all surfaces are set to Polished, or the sims would be even further away from actual. There are almost no internal components, but a mass object is in place to give the rocket the correct weight and balance.
Anyone have any idea why the sims are off and what can be done to get them to be accurate?
View attachment Grapeshot.ork