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19-02-2015, 21:13
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#16
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Registered User
Join Date: Jun 2014
Location: Earth
Boat: Amel Super Maramu 53 ft
Posts: 614
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Re: Are dark hulls hotter?
Quote:
Originally Posted by DeepFrz
At first I thought this was a misplaced title and should have been in the "Titles we want to see..." thread but then I realized that people are taking it seriously.
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Understood... but you have a different view of temperatures in Winterpeg
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19-02-2015, 21:37
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#17
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Registered User
Join Date: Aug 2010
Location: Central California
Boat: M/V Carquinez Coot
Posts: 3,782
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Re: Are dark hulls hotter?
The brighter the light, the lighter my color.
The boat is insulated and horizontal surfaces have light (white, yellow, and tan despite a light-gray deck) colors, so a darkish hull isn't a problem.
__________________
Kar-KEEN-ez Koot
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20-02-2015, 08:44
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#18
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Registered User
Join Date: Oct 2014
Location: Florida
Boat: Scout 30
Posts: 3,112
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Re: Are dark hulls hotter?
We live in Florida. After owning our white boat for about 5 years I painted the hull black. We anchor out a lot & did not have air conditioning on that boat. We had good ventilation & could not tell a difference with the darker hull. I loved the way it looked & would not hesitate to do it again.
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20-02-2015, 09:47
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#19
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Registered User
Join Date: Jan 2010
Location: St Michaels, MD
Boat: Cal 46-3, 46' ketch
Posts: 222
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Re: Are dark hulls hotter?
I can share from our experience in the Caribbean that anything you can do to cool the boat/ keep it from getting hot on the first place is well worth the effort/ consideration. Things like using an awning, always hang towels/ laundry on the sunny side lifeline (casts shade on some of the deck. We bbq'ed on outside grill, used microwave for cooking, and microwave for heating water for coffee. When you come in to anchorage pick a spot with good over water fetch of the trade winds and not backed up too close to shore (mosquitoes and flies dust & dawn), also once anchored/ moored open up engine compartment to let the heat escape as soon as possible and start cooling down ASAP.
Sent from my iPhone using Cruisers Sailing Forum
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20-02-2015, 09:56
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#20
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Registered User
Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,108
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Re: Are dark hulls hotter?
Quote:
Originally Posted by Scout 30
We live in Florida. After owning our white boat for about 5 years I painted the hull black. We anchor out a lot & did not have air conditioning on that boat. We had good ventilation & could not tell a difference with the darker hull. I loved the way it looked & would not hesitate to do it again.
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Is your hull cored? A cored hull, or one with insulation on the inside, is not as susceptible to heating up.
My experience with a green uncored hull was that you could burn your hand on the inside of it in direct sun.
Mark
__________________
www.svreach.com
You do not need a parachute to skydive. You only need a parachute to skydive twice.
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20-02-2015, 10:04
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#21
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Registered User
Join Date: Oct 2014
Location: Florida
Boat: Scout 30
Posts: 3,112
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Re: Are dark hulls hotter?
The boat that we painted the top sides black had a liner which might have helped to insulate it. However, vertical surfaces get much less sun that the decks & cabin top to they're not as affected most of the time.
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20-02-2015, 10:23
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#22
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Registered User
Join Date: Mar 2013
Boat: 45' CC ketch
Posts: 337
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Re: Are dark hulls hotter?
Use new generation of sun-reflecting pigments - adding those to colored paint will dramatically increase it's IR reflectability, and as a result, cool things down quite a bit, maybe even to levels of purely white hull. It's on my "to do"list for my future boat.
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20-02-2015, 10:45
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#23
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Registered User
Join Date: Oct 2011
Location: Titusville, FL
Boat: Shannon 38
Posts: 82
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Re: Are dark hulls hotter?
We sail a blue hulled Shannon, and previously owned a white boat. Yes, it's warmer. The insides of cabinets / drawers on the sunny side of the boat are quite warm. Shannon did a nice job of insulating the boat, and the boat has great ventilation, so even though we are Florida/Bahamas sailors we have never needed to sleep in the cockpit. On a winter's day, it is nice to close off the airflow and open the cabinets to take advantage of the solar gain.
However . . . not having been back to the boat yard in two years, the blue hull is not shiny and I dread when repainting time comes. If we decide to keep her blue, it would really mean a very expensive spray job.
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20-02-2015, 11:19
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#24
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Registered User
Join Date: Dec 2008
Location: SC
Boat: None,build the one shown of glass, had many from 6' to 48'.
Posts: 10,208
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Re: Are dark hulls hotter?
Quote:
Originally Posted by Island Time O25
In Maine if you want to prolong your sailing season dark hull is great. In Florida - not so much.
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My father painted the hull black and varnished topsides white. I'm not sure about a longer season being in the north east with a wooden boat but sure made her the sharpest looking one of her type. Has little or nothing to do with the question.
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20-02-2015, 11:48
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#25
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Registered User
Join Date: Jan 2007
Location: Italy
Boat: Contest 38
Posts: 16
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Re: Are dark hulls hotter?
Definately hotter. I have a white hull with a dark blue stripe aout 7" wide. Putting my hand on the inside of the hull the difference between the white area and the strip is really considerable. I wouldn't have a dark hull in the tropics but Maine yes!
Catherine
s/v Gentle Rain II
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20-02-2015, 12:09
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#26
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Registered User
Join Date: Dec 2008
Location: SC
Boat: None,build the one shown of glass, had many from 6' to 48'.
Posts: 10,208
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Re: Are dark hulls hotter?
Quote:
Originally Posted by Dr. Sea
I love the appearance of a dark hulled boat, but I wonder about the effect on heat inside the boat. I sail and plan to sail in mostly tropical areas, and I prefer to not be dependent on air conditioning, so a heat gain would not be good. How much heat gain would a dark hull cause?
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After reading the posts, it would be helpful to know what you hull is made of.
Naturally a darker hull will absorb more heat. Is the hull cored or insulated?
Is the trade off worth it to you?
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20-02-2015, 13:08
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#27
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Registered User
Join Date: Dec 2014
Location: Annapolis/Caribbean
Boat: Oyster 55
Posts: 304
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Re: Are dark hulls hotter?
Quote:
Originally Posted by Cadence
After reading the posts, it would be helpful to know what you hull is made of.
Naturally a darker hull will absorb more heat. Is the hull cored or insulated?
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Good question. I know the hull is not insulated, and I'm pretty sure that it is cored above the waterline.
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20-02-2015, 13:44
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#28
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Registered User
Join Date: Sep 2006
Posts: 9,398
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Re: Are dark hulls hotter?
Can't believe this thread has gone this far.
YES. The answer is YES.
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20-02-2015, 15:03
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#29
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Registered User
Join Date: Dec 2010
Location: W Carib
Boat: Wildcat 35, Hobie 33
Posts: 13,485
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Re: Are dark hulls hotter?
Quote:
Originally Posted by Sea Frog
Use new generation of sun-reflecting pigments - adding those to colored paint will dramatically increase it's IR reflectability, and as a result, cool things down quite a bit, maybe even to levels of purely white hull. It's on my "to do"list for my future boat.
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Have a buddy who is a coatings chemist for Sherwin Williams. He was involved in developing dark paints for military applications with IR signatures similar to vegetation.
Just by chance I introduced him to Chris White last year...I've heard that as a result there may be a dark hulled Chris White design under construction to be painted with these coatings.
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20-02-2015, 15:08
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#30
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Registered User
Join Date: Oct 2007
Location: Lakewood Ranch, FLORIDA
Boat: Alden 50, Sarasota, Florida
Posts: 3,470
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Re: Are dark hulls hotter?
Quote:
Originally Posted by 44'cruisingcat
Can't believe this thread has gone this far.
YES. The answer is YES.
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Actually, the answer is no. Absolutely!
Discuss....
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