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Learn about CE (centre of effort) and CLR (centre of lateral resistance) and then you can sail a boat without your rudder.

Was a challenging but fun thing to learn, and then teach to other kids.

Rudder movement is excess drag, the best of the best steer with the sails and weight placement.

Best to use physics to aid and minimize the drag of a rudder, Rather than eliminate it completely, but yes.

Nearly fell out with a guy over rudderless sailing in my intro to sailing course years ago.

It's not a "intro to sailing" skill, it's fairly advanced.

But yes, it is something that requires great teamwork and can certainly lead to conflict.