I would not be overly concerned about the sail. I sail my small boats on
narrow waters all the time, up river, down river, past high rise apartment
buildings, high banks, and low banks. The sails are all home made and
oddly shaped. Only the last one has any fullness built in by cutting
curved edges. And I sail the boats without rudders, using a paddle to help
tack. I have even sailed a shallow twisting narrow channel through a marsh
with the dagger board up. You can see old pictures in books of sails on
fishing boats and coastal cargo boats of odd shapes full of patches.
Unless you are racing it desn't matter all that much.



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