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.