came across this last night

http://www.ozecodrive.com/english/index_e.html

comes with everything u need except batteries. claims that sailing for
20 mins at 6 knots will charge the batteries enough for 5 minutes of
power sail.

all about 4500 including folding prop.

i read through the archives but nothing as complete as this was ever
discussed.

has anyone actually used these in real life? they seem like a great
alternative.