Astro Aerospace Limited (fka ASDN)

[busterator]

For the committed wingless multirotor believer:

Raed this document
[url][/url]https://www.uber.com/elevate.pdf

or if you can't be bothered to spend the time Page 4 Market Feasibility Barriers and Pages 35-42 "Vehicle Performance". Well-established engineering principles prove that transitional lift of helicopter rotors is inefficient; it's worse for multirotors at medium speed and almost nonexistent at high speed. Uber Elevate's advisory team (a well-educated group) agrees with physics.

This is not going to be a very widely used solution, if at all.