While putting my m-15 away for the winter, I finally opened up the bow compartment and found that there was no flotation foam under the cover. I had already noticed that there was no foam at the stern. I am planning to put in two part closed cell foam in the spring, and wonder if anyone has an opinion as to how much foam I will need, or how much weight I need to calculate to determine how much foam. Research seems to show that you don't need pound for pound for fiberglass, but you do for metal such as ballast, motors and spars. So how many cubic feet of foam floats an m-15?
on my old 15 the foam in the bow was a mix of blocks 'arranged' to fit. the foam filled 4/5 of the space. the 'stern' foam was one large block that fit between hull and the floor of the cockpit. the block fit snug against the partial 'bulkhead' that runs just aft of the cabin, and was 4 or 5 inches from reaching all the way to the stern. there are some pictures if you take the 'slideshow tour' of an M15 on my old boat's www-site - http://www.freewebs.com/m15-named-scred dave scobie M17 #375 - SWEET PEA visit SWEET PEA's www-site - http://www.m17-375.webs.com --- On Wed, 10/21/09, mrh219@yahoo.com <mrh219@yahoo.com> wrote: While putting my m-15 away for the winter, I finally opened up the bow compartment and found that there was no flotation foam under the cover. I had already noticed that there was no foam at the stern. I am planning to put in two part closed cell foam in the spring, and wonder if anyone has an opinion as to how much foam I will need, or how much weight I need to calculate to determine how much foam. Research seems to show that you don't need pound for pound for fiberglass, but you do for metal such as ballast, motors and spars. So how many cubic feet of foam floats an m-15?
Huh, so all that styrofoam was *supposed* to be in there?? Hm. I took it all out of the bow locker and used it for storage. What kind of closed cell foam are you planning on using? Perhaps I should replace it... On Wed, Oct 21, 2009 at 12:06 PM, W David Scobie <wdscobie@yahoo.com> wrote:
on my old 15 the foam in the bow was a mix of blocks 'arranged' to fit. the foam filled 4/5 of the space.
the 'stern' foam was one large block that fit between hull and the floor of the cockpit. the block fit snug against the partial 'bulkhead' that runs just aft of the cabin, and was 4 or 5 inches from reaching all the way to the stern.
there are some pictures if you take the 'slideshow tour' of an M15 on my old boat's www-site -
http://www.freewebs.com/m15-named-scred
dave scobie M17 #375 - SWEET PEA visit SWEET PEA's www-site - http://www.m17-375.webs.com
--- On Wed, 10/21/09, mrh219@yahoo.com <mrh219@yahoo.com> wrote:
While putting my m-15 away for the winter, I finally opened up the bow compartment and found that there was no flotation foam under the cover. I had already noticed that there was no foam at the stern. I am planning to put in two part closed cell foam in the spring, and wonder if anyone has an opinion as to how much foam I will need, or how much weight I need to calculate to determine how much foam. Research seems to show that you don't need pound for pound for fiberglass, but you do for metal such as ballast, motors and spars. So how many cubic feet of foam floats an m-15?
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-- Chris
Chris, Should you replace it? It all depends on how you value peace of mind versus the storage space. Keep in mind that after 11 years on this list, I haven't heard of anyone who needed the flotation. Mine is long gone. Bill Riker M15 - #184 Storm Petrel ----- Original Message ----- From: "Chris Smith" <chris.r.smith@gmail.com> To: "For and about Montgomery Sailboats" <montgomery_boats@mailman.xmission.com> Sent: Wednesday, October 21, 2009 12:04 PM Subject: Re: M_Boats: m-15 floatation
Huh, so all that styrofoam was *supposed* to be in there?? Hm. I took it all out of the bow locker and used it for storage. What kind of closed cell foam are you planning on using? Perhaps I should replace it...
On Wed, Oct 21, 2009 at 12:06 PM, W David Scobie <wdscobie@yahoo.com> wrote:
on my old 15 the foam in the bow was a mix of blocks 'arranged' to fit. the foam filled 4/5 of the space.
the 'stern' foam was one large block that fit between hull and the floor of the cockpit. the block fit snug against the partial 'bulkhead' that runs just aft of the cabin, and was 4 or 5 inches from reaching all the way to the stern.
there are some pictures if you take the 'slideshow tour' of an M15 on my old boat's www-site -
http://www.freewebs.com/m15-named-scred
dave scobie M17 #375 - SWEET PEA visit SWEET PEA's www-site - http://www.m17-375.webs.com
--- On Wed, 10/21/09, mrh219@yahoo.com <mrh219@yahoo.com> wrote:
While putting my m-15 away for the winter, I finally opened up the bow compartment and found that there was no flotation foam under the cover. I had already noticed that there was no foam at the stern. I am planning to put in two part closed cell foam in the spring, and wonder if anyone has an opinion as to how much foam I will need, or how much weight I need to calculate to determine how much foam. Research seems to show that you don't need pound for pound for fiberglass, but you do for metal such as ballast, motors and spars. So how many cubic feet of foam floats an m-15?
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-- Chris _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
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Jerry Montgomery can tell you how much. If I recall correctly you need a total of about 10 cubic feet of foam. ⎈--Gary ☺ On Oct 21, 2009, at 9:45 AM, mrh219@yahoo.com wrote:
While putting my m-15 away for the winter, I finally opened up the bow compartment and found that there was no flotation foam under the cover. I had already noticed that there was no foam at the stern. I am planning to put in two part closed cell foam in the spring, and wonder if anyone has an opinion as to how much foam I will need, or how much weight I need to calculate to determine how much foam. Research seems to show that you don't need pound for pound for fiberglass, but you do for metal such as ballast, motors and spars. So how many cubic feet of foam floats an m-15?
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It might be easier, cheaper, and more convenient to use truck or automobile inner tubes. If 10 cubic feet of displacement is needed, calculating the volume of each inner tube shouldn't be too hard. -----Original Message----- From: montgomery_boats-bounces@mailman.xmission.com [mailto:montgomery_boats-bounces@mailman.xmission.com]On Behalf Of Gary M Hyde Sent: Wednesday, October 21, 2009 4:45 PM To: For and about Montgomery Sailboats Subject: Re: M_Boats: m-15 floatation Jerry Montgomery can tell you how much. If I recall correctly you need a total of about 10 cubic feet of foam. ⎈--Gary ☺ On Oct 21, 2009, at 9:45 AM, mrh219@yahoo.com wrote:
While putting my m-15 away for the winter, I finally opened up the bow compartment and found that there was no flotation foam under the cover. I had already noticed that there was no foam at the stern. I am planning to put in two part closed cell foam in the spring, and wonder if anyone has an opinion as to how much foam I will need, or how much weight I need to calculate to determine how much foam. Research seems to show that you don't need pound for pound for fiberglass, but you do for metal such as ballast, motors and spars. So how many cubic feet of foam floats an m-15?
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If an M-15 weighs 750 pounds then (according to Archimedes) it must displace 750 pounds of water to float. Since a cubic foot of of fresh water weighs 62.42796 pounds, 12 cubic feet of floatation would be needed. Since some of the boat is made from materials that will float when immersed (wood trim, balsa cored deck) then theoretically we could get away with less. BUT, depending upon how your boat is equipped (anchors, chain, outboard etc.) cutting this number down too much is risky. Besides, the deck doesn't float until its in the water. On the other hand, If Jerry says 10 cu ft is enough I'd believe it. Jim On Oct 21, 2009, at 9:45 AM, mrh219@yahoo.com wrote:
While putting my m-15 away for the winter, I finally opened up the bow compartment and found that there was no flotation foam under the cover. I had already noticed that there was no foam at the stern. I am planning to put in two part closed cell foam in the spring, and wonder if anyone has an opinion as to how much foam I will need, or how much weight I need to calculate to determine how much foam. Research seems to show that you don't need pound for pound for fiberglass, but you do for metal such as ballast, motors and spars. So how many cubic feet of foam floats an m-15?
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participants (7)
-
Chris Smith -
Clarence Andrews -
Gary M Hyde -
James Poulakis -
mrh219＠yahoo.com -
W David Scobie -
William B Riker