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'Flettner Rotor' - xkcd (infosec.pub)

submitted 1 week ago by otter@lemmy.ca to c/comicstrips@lemmy.world

10 comments fedilink hide all child comments

Source: https://xkcd.com/3119/

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[–] otter@lemmy.ca 40 points 1 week ago (2 children)

I had to look this one up, I didn't realize how old the technology was

https://en.wikipedia.org/wiki/Flettner_rotor

A Flettner rotor is a smooth cylinder with disc end plates which is spun along its long axis and, as air passes at right angles across it, the Magnus effect causes an aerodynamic force to be generated in the direction perpendicular to both the long axis and the direction of airflow.[1] The rotor sail is named after the German aviation engineer and inventor Anton Flettner, who started developing the rotor sail in the 1920s.

A black and white photo of a small ship with two large pillar shaped rotors extending upwards from the deck

The Buckau, the Flettner Rotor Ship, photographed in 1924

[–] FuglyDuck@lemmy.world 17 points 1 week ago (1 children)

if you have two fletner rotors, you can attach two lights and and a giant face statue to it and make people really regret that bottle of rum.

[–] cerement@slrpnk.net 2 points 1 week ago

Master Control Program!

[–] lugal@lemmy.dbzer0.com 11 points 1 week ago

I saw a short documentary about them. They lost attractivity when fuel was cheap

[–] Mikina@programming.dev 6 points 1 week ago* (last edited 1 week ago)

This is the principle behind the rotor ships. It really is just a rotating cylinder.

[–] alzymologist@sopuli.xyz 6 points 1 week ago (2 children)

I thought a lot about these things, and apparently, a less elegant way to tackle this problem is decoupling power harvesting and propulsion. Like, put your best suitable power plant on a boat, then conduct power to best propulsion (probably submerged turbine or something)

[–] qjkxbmwvz@startrek.website 6 points 1 week ago (1 children)

https://en.m.wikipedia.org/wiki/Blackbird_(wind-powered_vehicle)

Can go directly upwind (no tacking required). Can also be applied to boats.

[–] tpyo@lemmy.world 4 points 1 week ago

I can't find the original video I wanted. It was by one of these guys (I think) for sure one of the bigger science creators, but then I DID actually find a more topical video, about this exactly!

This is one by Steve mould:
https://youtu.be/u5InZ6iknUM

Which was inspired by the veritasium one:
https://youtu.be/jyQwgBAaBag

[–] CommissarVulpin@lemmy.world 2 points 1 week ago

NS Savannah has entered the chat

[–] potpotato@lemmy.world 3 points 1 week ago

Sailboats already have ROW over motor boats.