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-   -   how much foam in a Mac or Venture 25? (http://www.sailnet.com/forums/macgregor/42011-how-much-foam-mac-venture-25-a.html)

malcolmwill 04-06-2008 11:57 AM

how much foam in a Mac or Venture 25?
 
Would any owners be willing to give me a ballpark estimate of the size, quantity, and location of the factory flotation? My Venture 25 came with foam blocks under the v-berth, but none in the stern. I've acquired some large Styrofoam, but don't know how much to put where.

Thanks in advance!

philbrown 05-21-2008 08:56 AM

On my V25
 
2 Attachment(s)
The blocks are large (not measured) and they just appear to fill the space. I have attached two images that show the blocks on the starboard size. About the same on port. Note the long perpendicular block, there is another behind it. I sail inland lakes and wouldn't be to concerned if my blocks were removed.

N0NJY 10-28-2008 11:12 AM

I just did a full "crawl through" on my new-to-me, 1979 Venture 25.

It has lots of loose blocks of floatation foam (Styrofoam actually).

The stern area has about 10 or 12 blocks of the stuff. There are several other areas where there is under-deck stowage compartments in the cabin, and in each of there there are 2-5 blocks.

Under the bow, beneath the sleeping area, there's some but I couldn't really check the quantity or size. I'll get back out there today.

Do you want pictures? Are you still on the site? (Noted you have only posted one message back in August).

Let me know if you're still around

malcolmwill 10-29-2008 04:07 PM

Phil and Rick,
Thank very much for the replies. Thanks for your pictures, Phil. Rick, if it wouldn't be too much trouble, I'd be grateful to see what you have as well. Even though I'm an inland sailor, I'm not too crazy about sinking in cold water. I'm currently in the process of cutting some dock foam to install (lots of fun!)
-Malcolm

N0NJY 10-30-2008 09:15 AM

Quote:

Originally Posted by malcolmwill (Post 392663)
Phil and Rick,
Thank very much for the replies. Thanks for your pictures, Phil. Rick, if it wouldn't be too much trouble, I'd be grateful to see what you have as well. Even though I'm an inland sailor, I'm not too crazy about sinking in cold water. I'm currently in the process of cutting some dock foam to install (lots of fun!)
-Malcolm

Malcolm, I'll see what I can get for you this weekend. Probably have time this weekend to snap some pictures for you!

I'm currently not YET a Sailor. Got a boat. Working on it. It's sitting at my home right now and it will be in the water first thing this Spring. Wife and I are planning classes (Basic Keelboat right now, perhaps some other stuff not long after).

I'm working on some problems on the upper deck and the overhead inside the boat in the cabin. Once I get that finished this weekend I'll be removing all the foam blocks anyway for some other work around the rudder brackets so I'll get some good images of the location of the blocks as well as the blocks themselves for you.

N0NJY 10-30-2008 09:33 AM

One other thing. This foam is really nothing more than a type of styrofoam, with smaller "bubbles" than the stuff you find in packaging material. That is, when it is made for packing and you break it up, little pieces or balls of it break off.

This stuff has finer "grain" than the packing stuff.

I'm not sure what sort of "flotation constant" this stuff would have....(hahah Flotation Constant... wonder if that can be worked out in physics somewhere. LOL!)

EdWarren 10-31-2008 07:34 AM

Not enough foam.
 
I have sailed for over 40 years, open ocean and currently sail midwest lakes. I have a very low opinion on the value of 'floatation foam'. I think it does a lot more to sell boats than to save boats. If it is there, good, leave it, there is no real imperative to remove it. If not theer,that's ok also. Because of the marketing, the novice is lead to believe this is a major safety item.

Spend your time and effort in learning how to sail, stay safe, and enjoy the boat. In midwest lakes, a good depth sounder will be more important than foam as a safety item. The 'charts' available are limited and not as good as the charts available for opean ocean. (They tend to focus on fishing, not navigation)

If you are really worried about floation foam, then I recommend you fill the entire cabin with nothing but foam or keep the boat on the trailer and you will be safe :) .

One last thought, the 'wrong' type of foam might be worse than no foam, if it absorbes water and as a result causes damage to fiberglass, wiring, plumbing".

On my boat Mac 26S, the 'foam lockers' are really sealed lockers and since air is a better floatation medium than foam, I really wonder about the effectiveness of the foam.

However, I submit for the 16 years I have had my boat, this issue has been a matter of 'religion' to the devotees and detractors of floatation foam. So others willl most certainly disagree with me.

Ed Warren (sailing Lady Warren Mac 26s near Omaha)

N0NJY 11-02-2008 05:25 PM

Actually, guys, I am not convinced that a bit of floating foam will keep the boat above water anyway.

I'm considering removing it anyway based on the fact I will be taking this boat on lakes and not in the ocean anyway. As for air flotation, well, you're right there - it would be much better with several closed chambers in a boat that could not be filled if the boat got hulled.

From a PURELY PHYSICS point of view I can see that a boat with such chambers would float better than one with foam blocks.

Anyway, I promised pictures, I've got them to upload when I get a few minutes

N0NJY 11-02-2008 05:37 PM

2 Attachment(s)
Ok, well, perhaps not. The system wants me to resize the files. That's more work than I want to do this second. I'll get them uploaded tomorrow. I'm exhausted tonight. :(

(Besides... my beer is calling my name!)

Ok, weird, a couple got uploaded, perhaps it is the number per message. Anyway, as you can see there are some big blocks of foam in there. Probably about eight or so in the stern. There are some more in other places of the boat, but they are smaller.

As mentioned before - I THINK they won't keep the boat floating myself.

EdWarren 11-03-2008 04:36 AM

NONJY
Welcome into the fold of the Church of foam questioner's. Live long and sail well.

Ed Warren sailing Lady Warren Mac 26s somewhere South of Omaha


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