Boating Discussion Thread, Does a polished hull increase efficiency? in Boats; I have some older bottom paint on my boat and it is not real rough but it was suggested that ...  | | 
Jul-03-2009, 01:22 PM
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#1 (permalink)
| | Registered User
Name: AC Vessel: 1988 Sea Ox 230 W/A bluewater Location: SD Job:tech
Posts: 193
| Does a polished hull increase efficiency?
I have some older bottom paint on my boat and it is not real rough but it was suggested that I sand it off to get better performance. Does anyone have any experience of before and after polishing?
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Jul-03-2009, 01:32 PM
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#2 (permalink)
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Name: marcus Age: 30 Vessel: 20' skipjack, steel leader Location: san diego Job:welder
Posts: 1,498
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race boats wax and polish there hulls, if it didn't help, they wouldn't do it.
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Jul-03-2009, 01:45 PM
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#3 (permalink)
| | Registered User
Name: Rick Age: 55 Vessel: 24" Bayliner R'Oasis Location: Yuma, Az. Job:Auto Repair
Posts: 41
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I have been wondering the same thing about my boat. Bottom was painted when I got the boat and it's actually very rough when compared to the smooth fiberglass hull. Since my boat doesn't stay in the water it really doesn't need the bottom paint but I don't know if it would be worth the trouble to remove it.
If I could only get that extra 1/2 mile per gallon it would open up whole new possibilities for fishing areas lol.
Would like to hear from someone who has done this or knows an easy way to remove the bottom paint.
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Jul-03-2009, 02:17 PM
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#4 (permalink)
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Name: Max Age: 47 Vessel: 21' Trophy Pro, @-EZ Location: Mira Mesa, San Diego, CA. Job:DoD Bio: USMC Retired
Posts: 3,386
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Smooth hull = less resistance.
No such thing as easy removal... Very painstaking event. Pay to have it removed.
Good luck.
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Jul-03-2009, 04:36 PM
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#5 (permalink)
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Name: Axel Vessel: n/a Location: USA Job:slave
Posts: 1,081
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only if her thighs are wet
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Jul-03-2009, 04:42 PM
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#6 (permalink)
| | Ex sport Capt
Name: Troy Age: 44 Vessel: 3 Location: West Side,Washington Job:Trying to be a thorn in the ass of anyone considering a closure
Posts: 1,837
| Quote:
Originally Posted by @-EZ  Smooth hull = less resistance.
No such thing as easy removal... Very painstaking event. Pay to have it removed.
Good luck. |
+2 with don't try to do this yourself without respirator and tox suit.(If the neighbor figure out what your doing and report it.............include HAZMAT clean up on your dime)
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Death should come in large numbers!!!!!!!!
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Jul-03-2009, 05:39 PM
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#7 (permalink)
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Name: Blaine Lake Vessel: Pursuit 2870 WAC Location: CA Job:doc
Posts: 76
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From the people that I've heard about they don't see any real improvement in fuel efficiency, and a very slight increase in top end speed.
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Jul-03-2009, 05:46 PM
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#8 (permalink)
| | Plate Alloy or die
Name: Lester Roberts Age: 49 Vessel: 23 Pacific Skintback Location: Whitesboro , Texas Job:Lineman Sup. Bio: Iron worker, Lineman, fireman,you can't Kill me
Posts: 205
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Yes the smooth hull is slippery to us BUUUUT it also creates a suction to the water , that is why most Go fast boats have stepped hulls [ to break the suction of the water surface ]
If it's painted now AND clean , I would leave it alone.
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Jul-03-2009, 06:36 PM
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#9 (permalink)
| | Registered User
Name: Eric Vessel: I build my own Location: Spokane, Wa Job:Firefighter/Paramedic
Posts: 309
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If speed is associated with smooth, why are sharks like sandpaper?
Arguments are made for both the smoothest possible surface as well as golf ball dimples, but nothing conclusive exists.
E
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Jul-03-2009, 08:38 PM
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#10 (permalink)
| | Captain
Name: Harry S. Stamper Vessel: Broken Location: Outside the Orange Curtain... Job:Asteroid Killer
Posts: 9,105
| Quote:
Originally Posted by Spokaloo If speed is associated with smooth, why are sharks like sandpaper?
Arguments are made for both the smoothest possible surface as well as golf ball dimples, but nothing conclusive exists.
E | Yep, and look at the lengths America's Cup boat go to get a rougher finish. As far as "race" boats, most of the hull is out of the water.
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I test gear in my living room. It's safer that way. Also, my boat's broke. The next one is going to have a sail....
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Jul-03-2009, 09:08 PM
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#11 (permalink)
| | Team Tail Chasers
Name: Leoman Vessel: Stringari 18' x 2 Location: San Diego Job:working to retire Bio: spend most of my time trying to go fishing
Posts: 1,910
| Quote:
Originally Posted by Spokaloo If speed is associated with smooth, why are sharks like sandpaper?
Arguments are made for both the smoothest possible surface as well as golf ball dimples, but nothing conclusive exists.
E |
exactly what I was thinking and the roughness may break thru the water tension better
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Jul-03-2009, 09:26 PM
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#12 (permalink)
| | i got crabs on my dinghy!
Name: jason Age: 36 Vessel: 26` blackman billfisher Location: point loma Job:contractor Bio: Drinks Coors light
Posts: 342
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When I was into the "go fast" boats. You did not want to wax or polish the bottom as it creates friction or suction. A lot of guys would sand the bottoms ever so slightly to gain a minimul amount of top end speed. The roughness would create air bubbles to break the friction or suction. These were boats doing well over 100mph so I don't think it matters on a " fishing" hull.
Also there is a product to remove bottom paint without sanding it off. Can't remember the name of it ??? But you brush it on then cover with special paper, wait then scrape it right off( or wash it off). Worked perfect on my center console when I got it.
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