Hello everyone,
This is my first post on the forum.
Inspired by SmurF’s post (SmurF - my foil assist - one more!), I built a similar foil assist unit:
Flipsky 6374 motor - Flipsky FT85BS controller - 16-cell LiFePo4 20Ah battery (5.25 kg)
For the remote, I chose to build a wired controller.
I used a Raspberry Pi Pico to generate the PPM signal.
The controller uses two Hall effect sensors and two neodymium magnets.
A 5mm USB cable is used for the wiring.
I can provide more technical details if you’re interested.
My battery is quite heavy, but by the fourth session, I managed to get up on the foil and complete three long flights 
The controller cable doesn’t get in the way much; it runs from the backpack along my right arm, secured by a nylon strap at the elbow.
The motor cables are much more cumbersome, especially when trying to stand up…