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Go Back   SailNet Community > General Interest > General Discussion (sailing related)
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  #11  
Old 05-26-2011
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I understand the pros of floatation
What are the Cons of installing floatation? besides space issues
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  #12  
Old 05-26-2011
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No thats not my boat its a skipjack I believe. Port browning is on pender island. A great pub, and marina. No snobbery.
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  #13  
Old 05-26-2011
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Quote:
Originally Posted by Windkiller View Post
I understand the pros of floatation
What are the Cons of installing floatation? besides space issues
Space is the big issue and a distant second is weight in the ends.
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Old 06-11-2011
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Regarding positive flotation in a smallmkeel boat - all the Schock Harbor 20s since approx. Hull 130 have foam flotation. We install 22 cubic feet of foam in a 1,800 disp. boat. We have a 6 ft bow tank.

It required a surprising amount of calculation and testing to get the location of the foam correct.

We found that one needs to be careful when cutting and inserting the foam to make certain to try and prevent the foam from chipping. Instead of a knife, we use a heated wire to cut the foam - it seals by melting the foam.

Also, select a foam that will not under any circumstance absorb water. We did extensive long term (30 & 60 day) immersion testing of closed cell foams and discovered some closed cell foams would absorb a minscule amount of water, this might lead to nasty molds and smells.

We heat shrink the foam blocks to seal them. We considered applying resin or gel coat as a sealant ( we have plenty of those materials around ), but decided on heat shrink wrapping the foam.

I agree that one should carefully consider wherenin the boat the foam is placed, ideally if the boat swamps it floats more are less level.

One should also consider the weight of the crew and the weight of the gear in the boat.

Finally, I think you might also consider glassing in air tanks with inspection ports similar to dinghies. If a DIY has enough experience, it should be easy enough to do.
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Old 06-11-2011
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I like the idea of watertight compartments. If you need to use the space it's there.
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