![]() ![]() ![]() See README_Dev.md for more information, or the verification and validation section of the code documentation for the expected results of the regression tests. See ray and mayavi github pages/documentation for more help getting them installed. Run the installOptionalPackages.py script to try installing them if you want to use those capabilities. The (optional) dependencies used to enable 3D flight path renders (mayavi) and parallelization (ray) are not installed by default because they're often tricky to get running. (Recommended) A Python virtual environment.Windows: install visual studio build tools or MinGW.C/C++ compilers OR an existing installation of Cython.Linux/WSL: install python3.X-dev package (includes python header files for Cython).The 90-deg CP location will probably be more forwards or closer to the CG, and thus more conservative, as compared to the 0-deg launch configuration, which the Barrowman Equations (there might be a spreadsheet version of those if you can not run RockSim or OpenRocket) is based on.Modular Aerospace Prediction Lab for Engines and Aero Forces The actual CP location varies with the angle of attack, and you usually start with a near zero in a no-wind take off. If the actual CG is in front of that estimated CP, then you ensure the rocket would weathervane in the correct direction into the wind, or nose first into the direction of flight. The balance point of the card board cut out is essentially the centroid of the area, where if you have an assumed constant pressure, like the aerodynamic force averaged out when at 90-deg angle of attack, that is where the net aerodynamic force will act. Make a cut out of the same shape in inches instead of feet, might not be as accurate, for example. You can use another rule of thumb for that as to peak thrust during the initial fraction of a second while you are on the rod, from a thrust curve plot, and the total weight of the rocket, so you have a certain ratio of Thrust to Weight, in terms of G's to make sure you have sufficient acceleration on the rod, or you might have to use a longer rod or rails, etc.Īs stated above the card board cut out method can be scaled. If you are not fast enough at the end of the rod then the fins are not aerodynamically effective and you may have a drastic change in orientation when the rocket leaves the pad under thrust. ![]() What is the danger of being too conservative? You might be led to believe you should add too much nose weight to acheive a higher stability margin than is actually required, which can slow down your speed at the end of the rod, which is another consideration in launch stability. The 90-deg CP location will probably be more forwards or closer to the CG, and thus more conservative, as compared to the 0-deg launch configuration, which the Barrowman Equations (there might be a spreadsheet version -UPDATE: see post #8 above- of those if you can not run RockSim or OpenRocket) is based on. Click to expand.as stated above the card board cut out method can be scaled.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |