Wanna Save Fuel? - SailNet Community
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post #1 of 14 Old 01-18-2009 Thread Starter
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Wanna Save Fuel?

Ran across this on Nigel Calder's Blog and was pretty amazed at the numbers.
Hey FastBttms...you might wanna distribute this around the docks!

"In the meantime, we discovered something really noteworthy with this summer’s limited test program. We had a propeller with just a few barnacles on it. As compared to a polished propeller, it increased the fuel consumption for a given boat speed by up to 50%, and dropped the boat speed for a given shaft speed by up to 30%. At the moment, the most cost effective way to improve efficiency under power is to regularly clean the propeller!"

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post #2 of 14 Old 01-19-2009
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good thing I have a sailboat.....

you know...move by the force of wind....wind creating lift...ahh I quit...you've allways been a motor boy anyway...
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post #3 of 14 Old 01-19-2009
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Cam,
I heard somewhere that a magnet made by Algae-X can save you even more fuel than some "test" by Nigel Calder whoever he is.

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post #4 of 14 Old 01-19-2009
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"A few barnacles"?
"50%"?

It would need more than a few to do that, methinks.

Last edited by Rockter; 01-19-2009 at 09:44 AM.
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post #5 of 14 Old 01-19-2009
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[QUOTE

[SIZE=3][FONT=Times New Roman]"In the meantime, we discovered something really noteworthy with this summer’s limited test program. We had a propeller with just a few barnacles on it. As compared to a polished propeller, it increased the fuel consumption for a given boat speed by up to 50%, and dropped the boat speed for a given shaft speed by up to 30%.[/QUOTE]

If I read that correctly, leaving a 'few' barnicles on my prop will make my Morgan slug go twice as fast Then I'm not going to clean it off, I have exactly 3 good size barnicles...

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post #6 of 14 Old 01-19-2009
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Quote:
Originally Posted by Rockter View Post
"A few barnacles"?
"50%"?

It would need more tha a few to do that, methinks.
Actually I could believe that. Last year I before dunking my boat for the season, I forgot to paint my prop with any type of anti-fouling paint or spray. Once the water got warm about 2 months into the season I went for a swim to clean the prop...it was nasty with 3 inch long strands of growth and barnacles. Once it was polished clean I noticed the boat seemed to jump out of the hole when put in forward. I couldn't believe how much just cleaning the prop did as I could be doing the same speed at 1100 rpms as I was previosuly doing at 1900.

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post #7 of 14 Old 01-19-2009
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Just a few would really cause a lot more cavitation, and the increased turbulence would greatly affect the prop's ability to push water...
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Originally Posted by Rockter View Post
"A few barnacles"?
"50%"?

It would need more tha a few to do that, methinks.

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post #8 of 14 Old 01-19-2009
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It's better smooth, yes. I wonder would a "few" barnacles do it though?

Maybe. I know not.
I'll scrape mine clean, next tide, but there are no tides in Loch Ness.
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post #9 of 14 Old 01-19-2009 Thread Starter
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Hey Giu...some guy on a Hanse on your dock called this morning to say there was a problem on your boat. Not to worry...he said he took care of it!

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post #10 of 14 Old 01-19-2009
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Quote:
Originally Posted by Rockter View Post
"A few barnacles"?
"50%"?

It would need more than a few to do that, methinks.
You should try sewing a couple of small kites (sticking straight out of course) to your sails and see how much it affects your sailing performance. It's the same thing.


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