You describe https://flow5.tech/flow5.html (Im not directly familiar, but it is an extension of xflr5 which I have used). Gives you the lift/drag/moment curves, and stability coefficients of a fixed wing drone/rc airplane
Circulation of cash is very low, only 3% of trensfered money is in cash according to this 2019 study https://www.norges-bank.no/en/news-events/news-publications/... Since then, with COVID where many stores refused cash payments, so it may have decreased further.