Hello, first post here. I am a recently retired guy, currently in process of scratch building my first new rocket in over 30 years. Launched several kit rockets in the early 70's, and a few more in early-80's while earning a degree in college. My goal is to attempt Tripoli Level 1 certification by the end of the this year.
Anyway, I used OpenRocket to design and tune a few things. I also wanted the Monte Carlo "splashdown" analysis. First, I am a bit familiar with Octave, the open source corollary of MatLab. I used it in performing some flight dynamics analysis for a project last year, when I was building an aircraft simulation. That project also made extensive use of the SU2 CFD software running on a dedicated Linux machine (I only mention that, as it may figure into future rocketry analysis projects as well.)
So, I tried using the latest Cambridge Rocket Simulator program, and could never get the FlightPlotter part to work properly. I think it was triggering a virus pattern alert, and it got quarantined. However, I was still able to export a .csv file of tabulated data so not a complete loss.
I then went to the Cambridge Rocketry Toolbox, and started with that. Very sparse "how-to" documentation for that, but luckily Octave has extensive documentation. Found I had to manually load a differential equation solver package into Octave before any of the routines would run. Here is a screen shot of the Monte Carlo done on Cambridge Rocketry Toolbox on Octave 4.0.2. It took about 5 minutes to run on a Windows 7 i7 machine. I'll probably upgrade to a newer version of Octave soon, as release notes say it now has even greater compatibility with MatLab .m scripts.
This seems to work, if you wish to use all open-source free software.
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