Clever scheme. I'm theorizing that there is a drogue
on one end of the line that induces drag and thus pulls the boggie board with the MOB
riding on it on return line towards the pulley sheeve. Definitely requires the MOB
to be able to grab the messenger line immediately after falling in the water
so as to deploy the rescue
board / drogue
to achieve a self rescue
. But if there is a crew onboard they could simply reverse the boat
and seemingly deploy the rescue board / drogue as they approach the MOB. The system's ability to bring the MOB onboard is pretty darn wonderful.
Seems like something one could rig up with just a few components and a bit of trial and error reconfigurations to optimize. Not sure of its PCT patent status, would require some searching of various patent databases to identify the inventor and patent application or issuance status. The film dates back to 2007 so a search with a date range may reduce the data to a reasonable number.
Thank you for sharing.