This comes from a pretty trusted source…
The Shock 40 Angry Beaver (R2AK) had a fuel cell on board to “charge the batteries”. Included in this was canting the keel via an electric pump. If the reports are correct, they were able to cant the keel back and forth and generate forward motion Sounds like with the main up they could generate ‘mo just like rocking a Laser. The power to cant the keel came from the fuel cell.
I doubt the race organizers understood how this system works and that by allowing it they’ve made their event look pretty much like a powered event.