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A comment on Drone Bubble Bursts, Wiping Out Startups and Hammering VC Firms. Parent comment

Re:Drone Bubble Bursts, Wiping Out Startups and Hammering VC... by ahartmetz on Thursday September 05, 2019 @03:36PM (#20890017)
A generator and four motors. Efficiency would probably be around 70%. It's about 90% in diesel-electric locomotives where more weight and money is spent on efficient conversion hardware.
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Re:Drone Bubble Bursts, Wiping Out Startups and Hammering VC... by scotty79 on Friday September 06, 2019 @09:12AM (#20895291)
That adds weight of 4 beefy electric motors to the system.

There's differential based continous variable transmission that varies according to resistive torque on a control shaft: https://makezine.com/2012/08/10/lego-continuously-variable-t...

This might enable electronic control witout using any motors just one simple coil per propeller. Energy generated through this way of control could be stored to power onboard devices.

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