dimitriarendt

The efficiency of a propeller depends on the ratio thrust/area, the smaller this ratio the higher the efficiency. (See 11.7.3 at https://web.mit.edu/16.unified/www/FALL/thermodynamics/notes...) The issue with the ducted fan is that the propeller size is constrained and the weight is higher due to the mechanical structure. A small quadcopter has twice or more propeller area for a portion of the weight.

I had a similar project on Kickstarter. https://youtu.be/xRviasOMCvk

We made 300k$ but then dropped the project and gave money back to backers. Basically beyond the "damn cool" effect there is no edge over quadcopter. It is less efficient. You gain something by the duct effect but the duct is heavy. It is very noisy. More sensitive to wind, especially when you try to reduce weight to make something affordable to build and sell. The only benefit was safety due to ducted fan but the point vanishes against mini drone the size of your hand like latest dji.

But for sure it s dann cool and fun tech to master. Kudos!

Shouldnt you write "by US" instead of "from Us"?