There was an article in Popular Mechanics recently that referenced recent findings on Leonardo Da Vinci’s screw bladed helicopter. They seemed to think that his design was more efficient and quieter for the same amount of lift. Perhaps it’s time...
Polarised filtering works best when the surface that is doing the reflecting is at a 45° angle to the viewer. So it wouldn’t work optimally if you are looking straight at the screen.
I’d be checking out the socket you’re plugging the usb into, especially if it’s a lightning equiped iPhone. Fluff gets compacted in there preventing the plug from seating properly. I’ve even seen the very end of cheap lightning plugs break off...
It’s way easier to resurrect a 3 year old post than it is to revive a drone dropped into salt water 3 years ago and written off by DJI no matter how much alcohol you bathe it in!