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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 10-01-2010
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Large fans to make wind

I just purchased some large industrial fans from home depot and was thinking i could use these to make wind on days when there isnt any. I have two group 27 batteries and a 1000 watt inverter. How long could i run these fans on high before my batteries will start to go down ? Also , What would be the best placement for these fans...I have a Cape Dory 28 which weighs about 9000 lbs. Right now i have both fans the cabin top facing upwards toward the mainsail.
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Old 10-01-2010
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I do not believe Newton would approve.

Newton's laws of motion - Wikipedia, the free encyclopedia

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Old 10-01-2010
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The fans won't run long from your group 27's, you'd be better off investing in a perpetual motion machine to power them
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Quote:
Originally Posted by Gene T View Post
I do not believe Newton would approve.

Newton's laws of motion - Wikipedia, the free encyclopedia

Gene
I'm pretty sure the OP is joking, but I'm not certain that this violates Newton's laws of motion, since sailboats don't sail by the force exerted directly on them by the wind, but by aerodynamic lift created by the airflow over the sail. I think in theory this could provide a small amount of propulsion, but it would be grossly inefficient.
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I was thinking i could also use these to charge my batteries on windy days by turning them towards the wind. Will this work ?
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Old 10-01-2010
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Already been done. This is where the wind actually comes from.

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Old 10-01-2010
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Old 10-01-2010
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Gives me an idea . . . take swamp boat, reverse fan direction, add mast and sails - watch out! . . . just have to figure out how to get rid of that pesky "equal and opposite reaction" thing - shouldn't be too hard!
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Old 10-01-2010
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Quote:
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Gives me an idea . . . take swamp boat, reverse fan direction, add mast and sails - watch out! . . . just have to figure out how to get rid of that pesky "equal and opposite reaction" thing - shouldn't be too hard!
What if you bolted the fans to the bow, then ankered the bow. Thin the sterne could go cause the equwal and oppozit thang wouldn't hapin. I think the ankering cord is gonna need ta be kinder long cause yuns cudnt git to fer wit a short cord.

Feel fre ta use my ider. I dont ned no creditt ifin it wrks. Ifin it dont the ider wuz my cuzin Jimmoez.

Gud luk
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Old 10-01-2010
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use a solar panel to create steam and jet the steam out the stern of the boat!
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