Sailing (Directly) Into the Wind

Humans have been sailing various seas and oceans for thousands of years, and using boats for potentially even longer than that. But as a species we wouldn’t have made it very far if it was only possible to sail in the same direction the wind is blowing. There are a number of methods for sailing upwind, but generally only up to a certain angle. [rctestflight] wondered if there was some way of sailing straight upwind instead and built this rotary sail craft to test the idea.


This is a companion discussion topic for the original entry at https://hackaday.com/2024/02/06/sailing-directly-into-the-wind/