Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 08-08-2015, 14:44   #1
Registered User
 
Cruiser2B's Avatar

Join Date: Apr 2011
Location: Norfolk
Boat: Westsail 32
Posts: 367
Deck Prism......photos?

I am in the process of refitting my Alberg 30. I am about to start on the decks and recoring job. I have considered adding a deck prism or two the the topside decks.

The obvious drawback is a hole in the deck that can be prone to leaking. But my Alberg is a bit dark below and want to add some natural light.

Do any of you have them, if so how do you like them and what if any are the associated issues? Can you post a photo of your application?

Thank you
__________________

__________________
http://svsalacia.blogspot.com
1971 Alberg 30..preparing to get underway!
USCG 100T Master Near Coastal with Inland Aux Sail
Cruiser2B is offline   Reply With Quote
Old 08-08-2015, 15:54   #2
Registered User
 
sanibel sailor's Avatar

Join Date: Feb 2013
Location: Sanibel FL
Boat: 1979 Bristol 35.5 CB
Posts: 977
Re: Deck Prism......photos?

Don't have one, but they work great- if you have never seen one in action, you will be surprised at the light. Main downside for me is cost. I have not found a cheap source for what seems a very simple item.
__________________

__________________
John Churchill Sanibel FL
NURDLE, 1979 Bristol 35.5 CB
sanibel sailor is offline   Reply With Quote
Old 08-08-2015, 16:15   #3
Registered User
 
Steady Hand's Avatar

Join Date: Jul 2014
Location: Crewing All of 2017 Available Globally
Boat: OPB = Crewing in 2017
Posts: 4,851
Re: Deck Prism......photos?

On the boats I have been on that have deck prisms, I have always thought they were a nice addition. But, if putting a hole in a deck, I think adding ventilation would be my first priority. For that I would add a Dorade vent (or several). After that, I would consider additional flat hatches that open (more light, more ventilation).
__________________
Ahoy All Sailors! Need experienced crew for a passage or delivery in Atlantic, Pacific, Caribbean, Med, PNW, ICW, coastal or across an ocean anytime in 2017? I am available on 24hr notice. See my CF Profile "About Me" page for details. Happy to lend a hand!
Steady Hand is offline   Reply With Quote
Old 08-08-2015, 17:10   #4
Registered User
 
Target9000's Avatar

Join Date: May 2009
Location: New Orleans LA
Boat: 74 Westsail 32
Posts: 1,379
Re: Deck Prism......photos?

We have two. They are notorious for leaks but after bedding in butyl rubber we've had no problems. In hot weather they let in a lot of heat so you need some way to cover them. We use a board while at anchor.
__________________
Let your heart tell you where to go, but let your brain tell you how to get there.

Sundowner Sails Again
Target9000 is offline   Reply With Quote
Old 08-08-2015, 17:20   #5
Registered User
 
Cruiser2B's Avatar

Join Date: Apr 2011
Location: Norfolk
Boat: Westsail 32
Posts: 367
Re: Deck Prism......photos?

Quote:
Originally Posted by Steady Hand View Post
On the boats I have been on that have deck prisms, I have always thought they were a nice addition. But, if putting a hole in a deck, I think adding ventilation would be my first priority. For that I would add a Dorade vent (or several). After that, I would consider additional flat hatches that open (more light, more ventilation).
Thank you, I am also adding more ventilation, pretty sure I have that covered. I am adding a few small hatches(lewmar 10 ocean series) and 2 forward facing opening portlights identical to that of Pearson Triton in the same location. My Alberg 30 and the Triton are near identical.
__________________
http://svsalacia.blogspot.com
1971 Alberg 30..preparing to get underway!
USCG 100T Master Near Coastal with Inland Aux Sail
Cruiser2B is offline   Reply With Quote
Old 08-08-2015, 17:21   #6
Registered User
 
Cruiser2B's Avatar

Join Date: Apr 2011
Location: Norfolk
Boat: Westsail 32
Posts: 367
Re: Deck Prism......photos?

Quote:
Originally Posted by Target9000 View Post
We have two. They are notorious for leaks but after bedding in butyl rubber we've had no problems. In hot weather they let in a lot of heat so you need some way to cover them. We use a board while at anchor.
Good info, Thank you. Where on deck are our prism located?
__________________
http://svsalacia.blogspot.com
1971 Alberg 30..preparing to get underway!
USCG 100T Master Near Coastal with Inland Aux Sail
Cruiser2B is offline   Reply With Quote
Old 08-08-2015, 17:23   #7
Registered User
 
Target9000's Avatar

Join Date: May 2009
Location: New Orleans LA
Boat: 74 Westsail 32
Posts: 1,379
Re: Deck Prism......photos?

On either side of the main cabin. One is over our table the other is over the settee.
__________________
Let your heart tell you where to go, but let your brain tell you how to get there.

Sundowner Sails Again
Target9000 is offline   Reply With Quote
Old 08-08-2015, 19:45   #8
Senior Cruiser

Cruisers Forum Supporter

Join Date: Nov 2012
Location: Long Beach, CA
Boat: Tayana Vancouver 42
Posts: 1,854
Deck Prism......photos?

I have 6 prisms. They add a wonderful amount of light. This first photo is under one prism in an otherwise dark quarter cabin. Click image for larger version

Name:	ImageUploadedByCruisers Sailing Forum1439083377.393487.jpg
Views:	123
Size:	11.6 KB
ID:	106997

Ours lasted 26 years before leaks. They are bedded in a black something like Life Caulk. I've just started replacing them. The leaks were not around the bedding but rather in the silicon that glues the plastic prism into its aluminum frame. The next two photos are an original prism and then a replacement.Click image for larger version

Name:	ImageUploadedByCruisers Sailing Forum1439083799.638156.jpg
Views:	100
Size:	15.9 KB
ID:	106998 notice the plastic prism is breaking down after 26 years in sun and salt. Click image for larger version

Name:	ImageUploadedByCruisers Sailing Forum1439083821.506844.jpg
Views:	182
Size:	14.3 KB
ID:	106999

Here is a below deck view. Click image for larger version

Name:	ImageUploadedByCruisers Sailing Forum1439083968.067414.jpg
Views:	113
Size:	7.1 KB
ID:	107000. It was hard to get detail in the strong light against the dark background. The inside finish is a plastic piece that may have been ordered from the same supplier.

Problem is these prisms were made by Bomar. Pompenette, the dealer for Bomar told me they haven't been made for years. Fortunately for me Ta-yang Shipbuilding the builders of Tayana boats knew exactly which parts had been put in my boat and that had some new old stock that they shipped out the next day. I got enough to replace all 6 of mine. Two done four to go.

If I were looking to put in deck prisms and not limited by the existing holes in the deck I would choose prisms that are clamped to the deck by their metal frame not ones that are glued into their frame from above. I'm told this type of structural silicon is what holds plate glass onto skyscrapers but I'd prefer a bolted metal frame.

Overall I would recommend the use of deck prisms to increase light below. Measure carefully, cut, seal the deck core well, bed carefully and you are good to go.




S/V B'Shert
__________________

__________________
Tayana42 is online now   Reply With Quote
Reply

Tags
deck, photo

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Re: Bedding a deck prism? mestrezat Construction, Maintenance & Refit 14 01-05-2016 20:22
Rebedding a Leaking Deck Prism - Advice ? windsaloft Construction, Maintenance & Refit 17 01-05-2016 09:36
For Sale: 'New' ABI Deck Prism (Old Stock) froggman180 Classifieds Archive 3 20-10-2009 13:08
Prism Polish Greg S Product or Service Reviews & Evaluations 0 27-05-2008 14:34
Deck Prism stuffinbox Construction, Maintenance & Refit 13 16-10-2006 18:08



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 10:22.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.