Was at the U.S. Army Transportation Museum at Ft. Eustis, VA (a very well done and extensive museum that is well worth checking out) and saw many historical marine craft. Never thought about how much the Army has dealt with marine craft and technologies. Landing craft, tugs, etc. all played a huge roll.

Anyway, they had this Vertical Axis Propeller on display. I have seen studies of these in much more recent times, but didn't know they had been tried and tested back when. Kind of a Z-drive without the Z... I can see some issues with trash getting tangled, maybe, but...