A nice invention from the kitefoiling scene: the Remora !
The story: http://www.kiteforum.com/viewtopic.php?f=196&t=2399694
Product presentation and tests: https://www.facebook.com/RemoraProducts/
Web site: soon
Availability: probably August 2018
Suitable for any foil activity with a 165 x 90mm screw pattern plate including efoil.
If used with an efoil, and if you don’t want to modify the integrity of your board, a solution that connects the motor cable going from board top to mast is still to be found.