At last, with priority date from 2016-09-12, the JetFoiler / Kaï Concept LLC patent from Don Montague et al :US20180072383A1 - Watercraft device with hydrofoil and electric propeller system - Google Patents
42 pages including 20 pages of diagrams.
Easy reading in pdf format: https://patentimages.storage.googleapis.com/bd/39/97/59c54cefec9fb6/US20180072383A1.pdf
Don’t hesitate to write your feedback below.
@pacificmeister: as more and more patents will be available online, maybe a “Patent” category could be useful.