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post #1 of 11 Old 03-07-2012 Thread Starter
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Sailing using water current

For long time it puzzles me that we can sail into the wind if we can apply the same principle to sail against the water current.

I have posted a video showing several configurations it is at:
(You my add a 'non-paddling paddle' to increase the speed if you need to sail against the current)

And Happy sailing
Phi

Last edited by PhiTran; 03-07-2012 at 12:52 PM. Reason: Add more
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post #2 of 11 Old 03-07-2012
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Re: Sailing using water current

After going faster than the wind when dead down wind was proven with a clever design i would guess anything could be done BUT not necessarily in a practical manner

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post #3 of 11 Old 03-07-2012 Thread Starter
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Re: Sailing using water current

This is the current practice to move a boat upstream

Stock Footage - Chinese Laborers pull boats upstream from a river which runs between high mountains in China.

Or.

Pulling a Boat Along the Yellow River, China - SU001009 - Rights Managed - Stock Photo - Corbis

The sample I posted simulate the heavy loaded watercraft.
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post #4 of 11 Old 03-07-2012
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Re: Sailing using water current

Great stuff. But as a physicist Id need more to be convinced. There is some debris in the water that seems to float against the current as well.
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post #5 of 11 Old 03-07-2012 Thread Starter
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Re: Sailing using water current

On the physic side, it is the aerodynamic lift force of the fluid effects on the foil (airfoil) as if of the airplane or of the sail going into the wind. A google may give much more info. As of physic, water and air are both fluid, but water are 1000 times the density, the force.

The setup is a water hose on left side of a manger, the debris stub are the result of the turbulence when the water hits the back (right) wall, As you may notice that 'boats' start speeding up when they pass the turbulence area.

Happy sailing.

Phi
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post #6 of 11 Old 03-10-2012
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Re: Sailing using water current

I have seen a car fairy that was self operated on a river,A cable accross the river held the Fairy and a vane in the water moved it accross using the water current! It could handle 4 cars ,But: you could wait a long time till someone came accross. It could be sent accross empty though....Dale

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post #7 of 11 Old 03-14-2012 Thread Starter
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Re: Sailing using water current

I also post a video showing that changing the attack angle one can move the boat model up/down the stream using its kinetic power itself.
it is:

Thanks
Phi
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post #8 of 11 Old 03-14-2012
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Re: Sailing using water current

Interesting stuff; there has been more experimentation on hydrofoils as of late. The boat of the future may very well change the paradigm of sailing bigger than the change from square sails to trianglar sails, with a coresponding change in performance.

Our engineering technology has grown in order of magnitude leaps since computer modeling became common. So far shipbuilders have been stuck in the past as races often disqualify earth shaking breakthroughs, and the public market like in cars follows the racing market. Buyers are slow to buy new unproven designs. Look at the continuing arguments over multihulls.

Would you buy a sailboat with no visible sails?

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post #9 of 11 Old 03-14-2012 Thread Starter
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Re: Sailing using water current

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Originally Posted by CapnBilll View Post
Interesting stuff; there has been more experimentation on hydrofoils as of late. The boat of the future may very well change the paradigm of sailing bigger than the change from square sails to trianglar sails, with a coresponding change in performance.

Our engineering technology has grown in order of magnitude leaps since computer modeling became common. So far shipbuilders have been stuck in the past as races often disqualify earth shaking breakthroughs, and the public market like in cars follows the racing market. Buyers are slow to buy new unproven designs. Look at the continuing arguments over multihulls.

Would you buy a sailboat with no visible sails?
This is not a sail boat as it is commonly understood. For example: one can not use this on the ocean (no water current) . . . . Nor it is to replace the engine, it's just an add on for those how are using river as a mean of transportation.

One may consider to build for his/herself a pair paddle like foil (as in first video) for emergency purpose if in case his engine stops function for he/she to somewhere upstream. Other purpose could be for rescue personnel to partially nullify the rage of the current, etc . . . . (as seen on TV)

My ultimate purpose is: if somehow, some way the the people in the underdeveloped area in the world would have the technology exposed. these a free energy to help them travel upstream will indeed be a big help.

(I m in TX too --- near Houston)
Phi

Last edited by PhiTran; 03-14-2012 at 11:04 AM.
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post #10 of 11 Old 03-14-2012
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Re: Sailing using water current

What about sailing with the current? 4 knots favorable current increases your apparent wind by 4 knots, right. So in an otherwise flat calm, you can just bear off and sheet in, huh?

sorry, thread hijack.
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