After so many fiddles I think I have finally tweaked my rig - my rig of crutches -- to its best advantage under sail. I'm sure some more changes are pending but for now I can say that I can sail the thing, even in today's shallow breeze of 4 knots.
The conditions of the last shot in the video of the Flying Crutchman sailing left to right is of the craft navigating due south with an eastery to its windward.
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More rigging adventures: