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Showing results 1 to 16 of 16
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Search: Posts Made By: eyytee
Forum: General Discussion (sailing related) 08-01-2014
Replies: 24
Views: 1,250
Posted By eyytee
Re: Inventing and experimenting.

No doubt that iceboats, and high end carts like the Greenbird can do 3x downind VMG. But I think most carts and multihull boats are more like 2x. The huge USA-17 trimaran could allegedly do 2.5x.
Forum: General Discussion (sailing related) 08-01-2014
Replies: 24
Views: 1,250
Posted By eyytee
Re: Inventing and experimenting.

Even if the track is just downwind? The DDWFTTW-cart achieved around 3x windspeed. Is that a realistic downwind VMG for a normal BloKart?
Forum: Cruising & Liveaboard Forum 08-03-2012
Replies: 10
Views: 1,372
Posted By eyytee
Re: speed vs wind

I think more relevant to conventional sailboats are those two animations, showing a downwind velocity made good greater than true wind speeed on broad reach:

DOWNWIND VMG GRATER THAN WINDSPEED...
Forum: Cruising & Liveaboard Forum 08-02-2012
Replies: 10
Views: 1,372
Posted By eyytee
Re: speed vs wind

I guess you mean the Blackbird:
http://en.wikipedia.org/wiki/Blackbird_(land_yacht)

It went directly downwind at 2.8 x windspeed, and direclty upwind at 2.1 x windspeed:
DownindRecord...
Forum: Cruising & Liveaboard Forum 08-02-2012
Replies: 10
Views: 1,372
Posted By eyytee
Re: speed vs wind

Yes, see:
Sailing faster than the wind - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Sailing_faster_than_the_wind)
Forum: Learning to Sail 04-07-2012
Replies: 56
Views: 17,321
Posted By eyytee
Re: Why is beam reach (or near to it) the fastest point of sail?

If you search for boat polars charts:

polar charts boat - Google Search


you will find that with sufficient windspeed the fastest course is broad reach. Especially for fast efficient boats or...
Forum: General Discussion (sailing related) 11-09-2010
Replies: 41
Views: 4,260
Posted By eyytee
Acceleration is caused by a non-zero net force....

Acceleration is caused by a non-zero net force. In this case:
F_thrust_prop > F_braking_wheels


No, it never becomes a turbine. A turbine.going DDWFTTW would push the air forward and accelerate...
Forum: General Discussion (sailing related) 11-09-2010
Replies: 41
Views: 4,260
Posted By eyytee
I did that one myself. Here the second part that...

I did that one myself. Here the second part that works continuously :

http://i46.tinypic.com/15q1y8n.gif

You will find more visualizations of here:

YouTube - eyytee's Channel...
Forum: General Discussion (sailing related) 11-06-2010
Replies: 41
Views: 4,260
Posted By eyytee
This car is not flying. It has surface contact...

This car is not flying. It has surface contact and uses it.

http://i46.tinypic.com/2ujo9jn.gif
Forum: General Discussion (sailing related) 11-06-2010
Replies: 41
Views: 4,260
Posted By eyytee
Yes, on water it is even simpler to go slowly...

Yes, on water it is even simpler to go slowly directly UP wind than directly DOWN wind faster than wind, because the water drag is the main problem.


Sure.

On water:
YouTube - Windmill...
Forum: General Discussion (sailing related) 11-05-2010
Replies: 41
Views: 4,260
Posted By eyytee
Don't ask for authority. Think for yourself! ;)

Don't ask for authority. Think for yourself! ;)
Forum: General Discussion (sailing related) 11-05-2010
Replies: 41
Views: 4,260
Posted By eyytee
No, it just rotates opposite direction from what...

No, it just rotates opposite direction from what it would be rotating if it was a turbine.

And what exactly does Wikipedia say about your claim that this must be 'perpetual motion'? Let me check:...
Forum: General Discussion (sailing related) 11-05-2010
Replies: 41
Views: 4,260
Posted By eyytee
What is wrong about it? It turns opposite to the...

What is wrong about it? It turns opposite to the torque generated by the fluid, like every propeller. Otherwise it would be a turbine.


Who (besides you) is talking about perpetual motion here?...
Forum: General Discussion (sailing related) 11-04-2010
Replies: 41
Views: 4,260
Posted By eyytee
NALSA requires less than 3.3 ft vertical...

NALSA requires less than 3.3 ft vertical variation along the track. But the El Mirage dry lake bed is far below this.
Forum: General Discussion (sailing related) 11-04-2010
Replies: 41
Views: 4,260
Posted By eyytee
What do you mean by "acting as sails" in physical...

What do you mean by "acting as sails" in physical terms? In terms of aerodynamics they are acting excatly just like sails on a broad reach with a downwind VMG > wind speed. This animation shows this...
Forum: General Discussion (sailing related) 10-23-2010
Replies: 41
Views: 4,260
Posted By eyytee
Invalid due to prior art: ...

Invalid due to prior art:

youtube.com/watch?v=0CrXvOKPymk


Well, some fundamentalists don't even accept the BMW-Oracle with the wing sail as a "sail boat". To me (and the North American Land...
Showing results 1 to 16 of 16

 

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