Build this remarkably lightweight, outdoor-capable, standard-sized 65mm brushless whoop-style drone using off-the-shelf parts, combined with a bit of fine soldering work. If you follow the instructions below, your finished ultralight whoop complete with first-person video camera should weigh between 13.5 to 14 grams — less than three nickels (15g)!

https://makezine.com/projects/the-lightest-fpv-whoop-drone/