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Old 02-01-2014, 10:44 AM   #1
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New Expedition Powercat Build

Having a new 67' powercat being built. Many opinions will be needed from forum. First. I am thinking 3/8 temp. glass all around. Any opinions?
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Old 02-01-2014, 10:51 AM   #2
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Greetings,
Welcome aboard. If you're thinking open ocean, 3/8" probably won't be enough unless your window/ports are very small. Along the same lines, the window frames have to be substantial as well. Personally, I'd go with laminated safety glass rather than tempered. Once a piece of tempered glass lets go, you're left with a hole. Laminated might break and might stay in the frame giving you some protection from water ingress.
Granted it will take more to break the tempered but there's still the gaping hole factor.
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Old 02-01-2014, 11:37 AM   #3
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Here is a guide for minimums, Section 14 windows:

http://www.eagle.org/eagleExternalPo...reYachts/Guide
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Old 02-01-2014, 03:07 PM   #4
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Here is a guide for minimums, Section 14 windows: http://www.eagle.org/eagleExternalPo...reYachts/Guide
After you figure out the thickness you need take a look at diamondsmart glass from diamond sea glaze. You also might want to look into adding storm plates for the large windows.

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Old 02-01-2014, 07:15 PM   #5
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This was my first Power Cat!
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Old 02-01-2014, 08:58 PM   #6
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see what others have done
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Old 02-01-2014, 09:26 PM   #7
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Powercat Glass width

Cannot find Domino's specs for glass. ABS seems to favor 10mm or more. So, 3/8 should be good. Thanks for the input,
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Old 02-02-2014, 03:40 AM   #8
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Having a new 67' powercat being built. Many opinions will be needed from forum. First. I am thinking 3/8 temp. glass all around. Any opinions?
Tell us more about the vessel?? ...or perhaps post some info over here, ..

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Old 02-02-2014, 06:23 AM   #9
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Seems to me, on a yacht that size, having more than required would be best, not almost the min.
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Old 02-02-2014, 07:26 AM   #10
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One problem with minimum strength laminated windows is that when structural loads are transferred to the window glass it will begin to delaminate. It shows up around the edges first and looks really awful.
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Old 02-02-2014, 07:57 AM   #11
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For ultimate strength and security the Dashew's use 19mm glass on there FPB's. Of course the are any ocean rated vessels.
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Old 02-02-2014, 10:26 AM   #12
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New Powercat Build

Just Catamarans in Dania Beach Fl. is finishing the build. They have some photos of her. She just arrived there 2 weeks ago. As far as glass. I think I read where Selene uses 3/8 glass everywhere but the pilothouse front. There, they use 1/2 inch. Using 1/2 inch for her pilothouse seems like a good idea.
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Old 02-02-2014, 10:36 AM   #13
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Greetings,
Mr. RickB. I understand the de-lamination issue but shouldn't windows be mounted to eliminate/minimize any transfer of load to the windows. Applying excessive force to the edges of tempered glass (potentially the weakest "link") is not the best idea either. Perhaps tempered AND laminated in one piece is the way to go if such a product is made.
Maybe this added to tempered glass to keep the opening intact if failure occurs? Just throwing ideas out there...http://www.premadasa.lk/glass_strength.htm
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Old 02-02-2014, 10:59 AM   #14
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Originally Posted by tenniscaptain View Post
Just Catamarans in Dania Beach Fl. is finishing the build. They have some photos of her. She just arrived there 2 weeks ago. As far as glass. I think I read where Selene uses 3/8 glass everywhere but the pilothouse front. There, they use 1/2 inch. Using 1/2 inch for her pilothouse seems like a good idea.
With all do respect. I have to ask the question.
Your building a 67' boat, I have to assume that an architect was involved. Seems he'd have a strong opinion.

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Old 02-02-2014, 11:40 AM   #15
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Architect and engineers have provided basic guidance. Sort of a minimal range for acceptable. Since this is a very custom build I have input as well.
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Old 02-02-2014, 04:56 PM   #16
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But its not a new build is it?
Looks to be a refit/modification.

From this


to this
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Old 02-02-2014, 05:00 PM   #17
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Architect and engineers have provided basic guidance. Sort of a minimal range for acceptable.
Easy then and I would think the window manufacturer will have an idea as well. Go bigger if you feel the need depending on cruising grounds.
Pointless making it icebreaker tough if in its intended cruising area it'll never see more than 20 knots of breeze.
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Old 02-02-2014, 05:20 PM   #18
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She is a new vessel not a refit. However she has a very long story to tell. Best to do with lots of alcohol available for pain! We are getting window bids now. I will take their opinions to heart. She won't be a North Sea icebreaker, but she must be fit enough for long passages. Thanks for the great advice.
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Old 02-02-2014, 08:48 PM   #19
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Best of luck with it. For sure, 67 ft. of Expedition Cat is no place to skimp on windows for sure. That beast deserves the best.
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Old 02-02-2014, 09:15 PM   #20
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Thanks so much. I would most appreciative for feedback on the build project. Many areas and applications are sort of new for a vessel like this.
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