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mrapkins
Navigator

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USA
124 Posts
Initially Posted - 08/26/2010 :  08:01:29  Show Profile
It was really hot on the boat the other day, with no wind. So, I took my Endless Breeze 12" fan up to the cockpit to cool myself. (This is a 12V fan that moves a lot of air very quietly)

It then occurred to me that if I had a really big fan I could use it to power the boat(downwind).

Or could I.....
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John Russell
Master Marine Consultant

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USA
3444 Posts
Response Posted - 08/26/2010 :  08:12:43  Show Profile
Aaaahhh, the next great thing!
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JohnP
Master Marine Consultant

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1520 Posts
Response Posted - 08/26/2010 :  08:50:07  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">if I had a really big fan I could use it to power the boat<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">...with a really big battery!
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OLarryR
Master Marine Consultant

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USA
3468 Posts
Response Posted - 08/26/2010 :  09:27:56  Show Profile  Visit OLarryR's Homepage
If a big enough fan and battery becomes too difficult, then maybe adapting those Hobie pedals is an option worthy to consider.
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bigelowp
Master Marine Consultant

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USA
1787 Posts
Response Posted - 08/26/2010 :  13:19:49  Show Profile
Regrettably, if the fan is attached to the boat then it will not work as the forward pressure on the sails will be offset by the backward pressure on the fan . . . remember doing that experiment in HS physics a zillion years ago -- but am still tempteted at times as you were . . . .
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Nautiduck
Master Marine Consultant

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USA
3704 Posts
Response Posted - 08/26/2010 :  15:11:03  Show Profile
Place the fan on the transom facing aft. This will propel the boat forward and create a breeze that the main can catch. just like an outboard. Motor-sailing!

A fan attached to a boat definitely will propel it. That is how the swamp boats work. I don't see how having the wind flow against a sail would change that.
Edited by - Nautiduck on 08/26/2010 15:18:12
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skrenz
Captain

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USA
351 Posts
Response Posted - 08/26/2010 :  15:12:03  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by bigelowp</i>
<br />Regrettably, if the fan is attached to the boat then it will not work as the forward pressure on the sails will be offset by the backward pressure on the fan . . . remember doing that experiment in HS physics a zillion years ago -- but am still tempteted at times as you were . . . .
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

Depends on where you put the fan. If you put it on the bow and tack you would not run into that difficulty. I wonder what the effective apparent wind would be in that case?
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bigelowp
Master Marine Consultant

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USA
1787 Posts
Response Posted - 08/27/2010 :  06:47:13  Show Profile
If the fan is aimed aft, absolutely, if the fan is aimed at the sails, problematic -- but a good experiment for someone (not me) with a gas powered leaf blower mounted to the stern rail . . .

Ya gotta think outside the box sometimes . . .
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OJ
Master Marine Consultant

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USA
4382 Posts
Response Posted - 08/27/2010 :  08:08:35  Show Profile
Try placing the fan wherever you like - but you'll still never exceed maximum hull speed . . .
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Stinkpotter
Master Marine Consultant

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Djibouti
9082 Posts
Response Posted - 08/27/2010 :  08:39:21  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by bigelowp</i>
<br />If the fan is aimed aft, absolutely, if the fan is aimed at the sails, problematic -- but a good experiment for someone (not me) with a gas powered leaf blower mounted to the stern rail . . .<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">I think you'll get better gas mileage with a lot less noise from your outboard... and it'll be easier to avoid ramming a dock.
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piseas
Former Treasurer

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USA
2017 Posts
Response Posted - 08/27/2010 :  08:53:15  Show Profile  Visit piseas's Homepage
Not to put down Mark for starting this post, but this just makes me laugh. I thought we all had "sail" boats,not "fan" boats.
Steve A
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britinusa
Web Editor

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USA
5404 Posts
Response Posted - 08/28/2010 :  03:43:10  Show Profile  Visit britinusa's Homepage
I think someone got confused, aren't we all big fans of Sailing !



Paul
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JohnP
Master Marine Consultant

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1520 Posts
Response Posted - 08/28/2010 :  14:51:36  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">...aren't we all big fans of Sailing?<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
OK...OK...but what if I had a reeeeeeeally long extension cord?
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Stinkpotter
Master Marine Consultant

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Djibouti
9082 Posts
Response Posted - 08/29/2010 :  07:23:02  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by JohnP</i>
<br />OK...OK...but what if I had a reeeeeeeally long extension cord?
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">...and I ran across it in Sarge...
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
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