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xkcd #3013: Kedging Cannon (xkcd.com)

submitted 5 days ago by schnurrito@discuss.tchncs.de to c/xkcd@lemmy.world

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The real key was inventing the windmill-powered winch.

https://explainxkcd.com/3013/

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[–] lennivelkant@discuss.tchncs.de 5 points 5 days ago (3 children)

Sounds like I had it mostly wrong. I definitely didn't know about the wing / "lift" / pull mechanic. The only part I did get right was that the sideways component of the force is offset by your ship shape, and even that I misphrased.

Thanks for the correction!

[–] statler_waldorf@sopuli.xyz 7 points 5 days ago

You're one of today's lucky 10,000.

[–] HappycamperNZ@lemmy.world 4 points 5 days ago

All good, its much more than that but gives a general idea

[–] waz@lemmy.world 1 points 5 days ago (2 children)

A fun next lesson is the benefit of apparent wind. In addition to the wind relative to the water, you have added wind generated by the movement of the boat. Since the lift generated is related to the speed of the wind relative to the boat, the faster the boat goes, the more lift you get. As a result, it is possible to actually sail faster than the wind speed of the wind relative to the water.

I'm pretty sure I did a bad job explaining that. Google can explain it better for sure.

[–] HappycamperNZ@lemmy.world 2 points 3 days ago

Similar thing - aparent wind shifts the wind direction forward. As such, how close a boat can sail to the wind decreases as the boat speeds up.

[–] Backlog3231@reddthat.com 2 points 5 days ago* (last edited 5 days ago)

That's too complicated. I'm just going to keep using the kedging cannon.