How could I get aerodynamic coefficients of aircraft ? - Page 1
Forum section: electronics / projects

author: ammjy
author_rank: Regular Contributor
timestamp: July 30, 2022, 11:49:56 pm
content: Hello, EEVBlog family !I am so sorry for my question if it is far from electronic topic.I will delete if you do not like(I do not think badly). However I really wanted to ask about it because it is related to control systems & electronics in further step.when we want to evaluate and simulation of aircraft, we need a specific coefficient data(derivatives etc..)related to speed, acceleration, moments things under specific condition.and we using it into aircraft modeling eqaution.So far, I only used already given data while study control engineering. And now I want to get coefficients myself from aircraft flight graph.But, I could not find a any literatures related to it except some of papers.Could you give some advice to this problem ?. Please, let me know..

author: CatalinaWOW
author_rank: Super Contributor
timestamp: July 31, 2022, 12:22:40 am
content: Not an aero expert, but worked closely with many. Historically these were developed empirically in wind tunnels for each air vehicle. Even modest changes to configuration would cause a return to the wind tunnel. Starting roughly in the 1990s attempts were made to use computational fluid dynamics. These early models needed to be trusted by wind tunnel tests, but then could be used for minor. changes. While less and less wind tunnel work is required, to my knowledge this remains the general situation. For crude approximations you might look at DATCOM.

author: ammjy
author_rank: Regular Contributor
timestamp: July 31, 2022, 12:45:32 am
content: I appreciate for your advice !

author: jpanhalt
author_rank: Super Contributor
timestamp: July 31, 2022, 12:54:34 am
content: I cannot give a simple answer to your question, but you may want to contact a few notable American universities for that data. I know University of Illinois had a researcher doing extensive work on airfoils at low Reynolds numbers for model aircraft. Mark Drela at MIT was also doing similar work. Here's a link to some of Selig's work,:https://m-selig.ae.illinois.edu/uiuc_lsat/Low-Speed-Airfoil-Data-V1.pdf) Sadly, I believe he died in a small plane crash years ago. Here is a very short list:CalTechA potential contact person at end of article:https://www.caltech.edu/about/news/improving-aircraft-design-with-machine-learning-and-a-more-efficient-model-of-turbulent-airflowsAn example?https://www.researchgate.net/figure/Accuracy-and-speed-in-Youtube-Objects-Dataset_fig3_331543786Data?https://data.caltech.edu/Other major American universities such as University of Washington, University of Illinois, and Johns Hopkins U.(Applied Physics Laboratory -- mostly space applications recently), and Massachusetts Institute of Technology (MIT).

author: ammjy
author_rank: Regular Contributor
timestamp: July 31, 2022, 01:08:57 am
content: I appreciate for your detailed kind answer, it must be helpful for me.

author: buta
author_rank: Contributor
timestamp: July 31, 2022, 02:05:42 am
content: NCAC (now NASA) published data of various airfoils for wings and blades:https://www.nasa.gov/image-feature/langley/100/naca-airfoilshttp://airfoiltools.com/airfoil/naca4digithttps://ardupilot.org/is one of the open-source flight controller projectsEdit 1:airfoil datahttps://m-selig.ae.illinois.edu/ads.html

author: ammjy
author_rank: Regular Contributor
timestamp: July 31, 2022, 02:06:51 am
content: I appreciate for your kind helpArduPilot would very interesting to me.

author: jonpaul
author_rank: Super Contributor
timestamp: July 31, 2022, 02:51:39 am
content: Data are provided by airplane manufactureres to get flightworthiness approvals.Try a specific plane type egsingle engine Cesna 172 or Passenger jetsBoeing 737-300 or Airbus A320many websites should have this in detailJon

author: ivaylo
author_rank: Frequent Contributor
timestamp: July 31, 2022, 05:10:24 am
content: The gaming/simulation communities should know this. I know for a fact that folks design from scratch or modify their aircraft in programs like X-Plane 11 and such…

author: Mechatrommer
author_rank: Super Contributor
timestamp: July 31, 2022, 06:16:07 am
content: Top 10 of the best aircraft design software

author: ammjy
author_rank: Regular Contributor
timestamp: July 31, 2022, 08:26:57 am
content: Thanks you for your time !, I appreciate, Jon Paul.

author: ammjy
author_rank: Regular Contributor
timestamp: July 31, 2022, 08:28:32 am
content: Ya ! Thanks youI agree with you. It's only now that I remember seeing something similar in the relevant community.

author: ammjy
author_rank: Regular Contributor
timestamp: July 31, 2022, 09:01:16 am
content: Thanks you !

author: langwadt
author_rank: Super Contributor
timestamp: July 31, 2022, 11:08:40 am
content: Quote from: CatalinaWOW on July 31, 2022, 12:22:40 amsorta related, Formula one has limits on CFD usage and windtunnel time, in number of TFLOPS and number of hours per week.I believe they can trade between them, something like one TFLOP instead of one hour windtunnel

author: buta
author_rank: Contributor
timestamp: July 31, 2022, 11:25:42 am
content: QuoteProperly you can find some UAV flight logs (including sensor inputs, motor power, ...) in Ardupilot discuss forum. Usually the file name is *.bin, the files can be read by GCS e.g. Mission Planner (a open source Windows program), MP can plot and export the flight data.just find one example but I don't check its flight logs:https://discuss.ardupilot.org/t/lack-of-power-in-vtol-mode/87408