Hi slowrotor. You've been quiet for a while. Any new project?
So what has happened with lithium hydroxide in the last 30 years?
There sure appears to be a lot of research going on now. However, like the implementation of the reciprocating engine, the helicopter may be one of the last modes of transportation to go electric.
This 30-year-old NASA report by Hughes Helicopters and Continental has the electric motor and the rotor on a common axis. This logical arrangement is what Sikorsky is currently attempting to patent.
Dave