Curious thing in Open Rocket

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Tom

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I found a .roc file for the estes Loadstar and it seems to have pretty good fidelity.

But I tried something and was a little surprised by the results. Basically the rocket is a two stage rocket. The default design is with the fins lined up with one another. I ran the sim in that configuration.

Just for fun I then rotated the fins on the booster section 45 degrees so the fins would be in between one another. I figured that would up the drag factor. Ran the simulation with the same engines and the results were identical to the default configuration!?
 
I suspect the entire flight regime was substantially subsonic, and the fins aren't close enough together to interfere with each other dragwise.
 
I found a .roc file for the estes Loadstar and it seems to have pretty good fidelity.

But I tried something and was a little surprised by the results. Basically the rocket is a two stage rocket. The default design is with the fins lined up with one another. I ran the sim in that configuration.

Just for fun I then rotated the fins on the booster section 45 degrees so the fins would be in between one another. I figured that would up the drag factor. Ran the simulation with the same engines and the results were identical to the default configuration!?
Have you seen my .ork file?

26784744726_e9917d020a_o.png


https://www.rocketryforum.com/threads/kteshs-openrocket-files.123564/page-2#post-1443676
 
Last edited:
I doubt if OR takes into account alignment of fins like that. I tend to think that fully modeling the effects of that sort of thing are beyond the scope of the program. I can try to find out if you like...
 
Thanks Ktesh that is actually the .roc file I am using. Like I said seems pretty high fidelity.

Thanks Neil but that's pretty much what I figured. No need it was just something I noticed.
 
Thanks Ktesh that is actually the .roc file I am using. Like I said seems pretty high fidelity.

Thanks Neil but that's pretty much what I figured. No need it was just something I noticed.
When you said .roc, you had me fooled... OpenRocket saves as .ork files (OR can open .rkt files too). Glad you like it!
 

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