CvikDasa Posted January 6, 2017 Posted January 6, 2017 Hi, Im new here and I would like to share my project with you.I did this simple scale wich is able to measure your rocket thrust, fuel used, how long it burns etc. https://www.youtube.com/watch?v=bPTmYTT-avAIt is really easy to do and you can do it! Basicly you need three things... scale, arduino and hx711 ADC. Connect them together and thats itopen video on youtube and there is everything in the desctiption.Complete project costs less than 10$.Im sorry but english is not my first langugae 1
jbeuckm Posted March 7, 2017 Posted March 7, 2017 I'm using the HX711 similarly. My project is all here: https://github.com/jbeuckm/thrust_bucket How do you determine where to start and stop measuring? Data past the end of the burn would result in a lower Impulse since the absent propellant pushes the force values negative. This example finds 5% of max thrust and uses the data above that. Where should I pick to match theoretical outputs from Burnsim?
lloyd Posted March 7, 2017 Posted March 7, 2017 (edited) Um.... you calculate the area under the thrust curve not before and after the thrust period. (!?!?) If you wish to be thorough, you calculate from the time thrust begins until it ends... Most folks use around 3-5% as a reasonable approximation of that. Lloyd Edited March 7, 2017 by lloyd
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