user 30299
L2 - NAR & TRA
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- Nov 6, 2019
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Ok. Thanks for that tip. This file I sent you is from Jason with Loc and that is the stock file. I haven’t done anything to it. So I should weigh the avbay, main section and booster separately and then with a string balance and find the CG of those and input each one into RS? Is there anything else that I should weigh and correct? Is it not good enough to just balance the final built Rocket all put together and input the CG of that isn’t RS? I have not done that into RS yet as I am still learning this program. Thanks for the help.
Yes - in the end once the rocket is finished you weigh the whole thing, find its CG with the string method, and input those two numbers into RS in the Mass Override Tab. This will override all the individual component weights and CGs. Use that for all future stability checks and motor simulations.
All the initial weights & measures help give you a feel for how the rocket may perform, and gives you a heads-up on any possible severe stability issues.
And you may want to correct the fin tabs in the RS file. The fin profile got tagged to the 54mm motor tube and not the 75mm motor tube. Take a close look at how the fins pass thru the wall of the body tube.
If you're using an Aero Pack 75mm motor retainer, like in the photo, you will need to add about 135g to the end of your rocket. That will pull your CG back to the CP real quick. You can enter it as a Mass point. The other picture shows how I can simulate the retainer so that I have a 2D & 3D design that pretty much resembles the build.
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