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Old 19-02-2015, 22:13   #16
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Re: Are dark hulls hotter?

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Originally Posted by DeepFrz View Post
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.
Understood... but you have a different view of temperatures in Winterpeg
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Old 19-02-2015, 22:37   #17
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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.


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Old 20-02-2015, 09:44   #18
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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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Old 20-02-2015, 10:47   #19
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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.


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Old 20-02-2015, 10:56   #20
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Re: Are dark hulls hotter?

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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.
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.

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Old 20-02-2015, 11:04   #21
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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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Old 20-02-2015, 11:23   #22
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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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Old 20-02-2015, 11:45   #23
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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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Old 20-02-2015, 12:19   #24
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Re: Are dark hulls hotter?

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Originally Posted by Island Time O25 View Post
In Maine if you want to prolong your sailing season dark hull is great. In Florida - not so much.
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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Old 20-02-2015, 12:48   #25
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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!
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Old 20-02-2015, 13:09   #26
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Re: Are dark hulls hotter?

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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?
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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Old 20-02-2015, 14:08   #27
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Re: Are dark hulls hotter?

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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?
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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Old 20-02-2015, 14:44   #28
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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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Old 20-02-2015, 16:03   #29
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Re: Are dark hulls hotter?

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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.
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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Old 20-02-2015, 16:08   #30
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Re: Are dark hulls hotter?

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Originally Posted by 44'cruisingcat View Post
Can't believe this thread has gone this far.


YES. The answer is YES.
Actually, the answer is no. Absolutely!

Discuss....
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