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Old 23-11-2006, 19:57   #16
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All this dark nonskid talk reminds me of John Gross'es racing catamaran "Fastback Blackbird" that raced in the Brisbane to Gladstone.

It was light ply construction using vinylester resin and painted black, his idea being that crew weight would be halved because at any given time half his crew would be in the air trying to keep off the black non-skid.

She also had a centre cabin/ pod that was quick release allowing one to motor away with the Yammie 9-9 in emergency and the interior of the cabin had hot pink shaggy fabric and a Volvo rear vision mirror with fluffy dice, no joke.

You can see the hot pink in one of the pics

This boat sailed fairly well and his Fastback 43 and 33 are a popular design in Aus.
John and Judy are currently building a ramjet plane made from endgrain Balsa............. Wildman.

Dave
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Old 24-11-2006, 04:19   #17
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Hi all.
Another tip.
For your bimis or cotpit covers, again use white in the summer but dark , ie blue, in the winter. Our first winter in Turkey was very cold . The second after getting a dark blue cover, was exelent during the winter days.

Best regards
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Old 24-11-2006, 05:18   #18
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Interestingly enough as far as fade goes. Awlgrip dark green is the worst followed by dark blue.

For canvas the opposite is true. Blue is the least likely to fade with green a close second. Anything with red, yellow, tan, or brown will show fading quite quickly even after only one year at mid latitudes.
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Old 24-11-2006, 07:39   #19
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I suppose, as most heat is actually at the red-infra red end of the spectrum, that that is the colour that needs to be reflected most. So, contrary to appearances, a red boat would be cooler than a blue boat (as red paint reflects red light and blue absorbs it).

So, if you don't want white, pink is next best, then red?
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Old 24-11-2006, 08:20   #20
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Things that appear to be black in the visible spectrum may or may not be black at other frequencies and this can have an effect on the overall amount of energy absorbed.
So what is the actual determining factor for how much photonic energy will be absorbed and converted into heat?
Here are some interesting references that might illustrate how complicated the question actually is.
Goto:
http://lists.meer.net/pipermail/junk...er/000022.html

By analogy:
On a sunny day, roof temperatures can range from comfortably warm to egg-frying hot, depending on how much sunlight they reflect. Different roofing materials were tested side-by-side by Lawrence Berkeley Laboratory researchers; their peak temperatures are listed below.
* Black acrylic paint: 142deg. F
* Galvanized steel: 138deg. F
* Black acrylic paint infrared-reflecting film : 123deg. F
* Common "white" fiberglass/asphalt shingle : 118deg. F
* Clay terra cotta tile : 112deg. F
* Red acrylic paint: 106deg. F
* Light green acrylic paint: 104deg. F
* White acrylic paint: 74deg. F
* Hyper white" acrylic paint : 65deg. F
Ambient air temperature at the time of the test was 55deg.F.
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Old 24-11-2006, 09:49   #21
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It would appear the specific heat of the actual material is part of the picture as well as color.
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Old 24-11-2006, 16:03   #22
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Had a red awlgrip stripe on a cat over here that literaly faded to white over a few years.
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Old 25-11-2006, 00:10   #23
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Red is the first to fad

We have a red sail boat here in the dry yard that looked new when we came in. It hasn't moved in that 4 years. Now it looks like a faded out candy cane. The white deck is bleeding off over the bleached out sides. Looks Bad!!!
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Old 25-11-2006, 02:38   #24
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Well I appreciate all the info on epoxy guys - certainly understand the issues more now than I did before.

Yet another example of how well this site can educate!

Thanks

JOHN

PS Er yes. Guess all I now need to do it decide where I go with my dark blue epoxy yacht......
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Old 25-11-2006, 08:35   #25
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Swagman, with your dark hull from the factory I would not worry about taking it anywhere. Builders engineer and construct boats to accept the higher heat that dark hulls live with. It is probably built with a high temp epoxy and additional mat to eliminate print through.

I know of an Evelyn 32 that was painted black and the hull heated up enough for the foam to delam. They repaired the boat and repainted white. There is also a boat at our club that was molded white but repainted navy. Now you can see every bulkhead and the print through is pronounced. Maybe it was like that when white but unnoticable or maybe the hull is not handling the higher hull temp well. I don't know.

To sum it up. If you have a glass boat from the factory that was originally dark chances are it was built to handle the higher heat. If your boat was built with a light color and you repaint it dark you may or may not create a problem.

Oh, and by the way the Hanse 461 is a lovely boat. With 80 foot of stick it must be quick and fun to sail.
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