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oars are cheap and work well in very shallow water
and work on almost any small boat
props are complex costly and need more draft [deep]
and are very eazy to damage
and the whole boat needs to built around the prop drive system
and have lots of friction loss in the systems
that hobie thing needs alot of draft
and I bet it is very eazy to break
I had a addon outboard hard operated prop unit [yardsale junk]
it suckked big time, lots of effort gave little force
forget even moving up wind in more the 5 mph winds
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