On Tuesday, January 9, 2018 at 6:30:12 PM UTC-5, Nick Kennedy wrote:
Is this the future? No more shock cooling here!
https://newatlas.com/siemens-airbus-...-glider/48806/

Energy regeneration idea raises an engineering problem: how do you
optimise the total energy used?
A well designed prop for traction ( 80-90% power transfer) will be pretty poor
as a wind turbine .
A PhD to be won for designing a prop which maximises the energy transfer.
This includes glider in the equation.

JMF