Engwe x5s

Nealh

Esteemed Pedelecer
Aug 7, 2014
20,912
8,528
61
West Sx RH
Nothing new, drive shaft bikes have been tried and built over here many years ago.
Kirstin who once posted frequently on here had a Sussex shaft drive bike for commuting.
 

sjpt

Esteemed Pedelecer
Jun 8, 2018
3,823
2,750
Winchester
Drive shaft probably makes sense on that sort of bike; I suspect that the motor will mostly be doing most of the work, so inefficiency in the transmission of the human power is relatively unimportant.

I don't think I'd enjoy riding it if the motor failed or the battery ran out (but that's true of our Motus too).