There are some people looking into active noise cancellation[0], but I have no idea whether that's viable. A (more) silent drone will be huge for online shoppi

There are some people looking into active noise cancellation[0], but I have no idea whether that's viable. A (more) silent drone will be huge for online shopping/meal delivery. Amazon has ambition to eventually deliver most packages to most places in matter of (tens of) minutes. [0] https://scholarworks.gsu.edu/cs_theses/98/ https://scholarworks.gsu.edu/cs_theses/98/