Wind powered machine faster than the wind

[pgk pgkParticipant @pgkpgk17461]

How cool is this?

https://www.youtube.com/watch?v=F7PNSyAfCjk

And the math?

[pgk pgkParticipant @pgkpgk17461]

Blackbird – counterintuitive: even into wind

[John HaineParticipant @johnhaine32865]

Ice yachts and sailing hydrofoils can move faster than the wind when on a "broad reach". Windsurfers in a good breeze can go nearly as fast as the wind.

[pgk pgkParticipant @pgkpgk17461]

But this machine can go downwind faster than the wind as opposed to only doing so with a side-wind component. can any of ice yachts and hydrofoils go directly into wind?

The method used does suggest that a boat might do so with a rotating sail connected to a subsurface propellor.

[Jon LawesParticipant @jonlawes51698]

Fantastic. Good find.

[john halfpennyParticipant @johnhalfpenny52803]

This old chestnut has been done to death elsewhere, many many times. I humbly suggest forumists don't go down the rabbit hole.

[JourneymanParticipant @journeyman]

Idea of rotating sails has been around for a bit. This is vessel equipped with a Flettner Rotor circa 1922.

Link to article describing said rotor and theory off *** LINK ***

John

[Martin KyteParticipant @martinkyte99762]

Posted by pgk pgk on 10/01/2022 10:34:30:

But this machine can go downwind? faster than the wind as opposed to only doing so with a side-wind component. can any of ice yachts and hydrofoils go directly into wind?

The method used does suggest that a boat might do so with a rotating sail connected to a subsurface propellor.

Do you really mean downwind. The land yacht travels into the wind and the clip is captioned upwind.

regards Martin

[John HaineParticipant @johnhaine32865]

If it was moving downwind at the wind speed, how would it know the wind was blowing?

[pgk pgkParticipant @pgkpgk17461]

Posted by Martin Kyte on 10/01/2022 11:17:14:

Posted by pgk pgk on 10/01/2022 10:34:30:

But this machine can go downwind? faster than the wind as opposed to only doing so with a side-wind component. can any of ice yachts and hydrofoils go directly into wind?

The method used does suggest that a boat might do so with a rotating sail connected to a subsurface propellor.

Do you really mean downwind. The land yacht travels into the wind and the clip is captioned upwind.

regards Martin

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