Re: M_Boats: Is the foam under my starboard cockpit seat structural or for fl...
I 'think' my seat at the location in discussion here has a balsa core as do all the horizontal surfaces on the deck (coaming 'cap' and companionway sliding hatch excepted) - probably PO's version of insulation. My boat is a 1980 # 316 FWIW. Old deck and interior. You know - the collectible ones! Have a great day, Go Sailing! GO In a message dated 4/18/2014 11:07:02 A.M. US Mountain Standard Time, scoobscobie@gmail.com writes: the foam in your prior picture does look 'low density' so the insulation idea seems logical. i've inspected a couple of the 'old deck' M17s (when i was looking to buy a M17 and to help others) ... i can't say 100%, but i think the 'old deck' M17s don't have any core in that location. don't hold me to this, i honestly can't remember. (Jerry?) there is core in the locker lids ... i inspected a boat where the locker lid core was completely rotten. On Fri, Apr 18, 2014 at 11:23 AM, <swwheatley@comcast.net> wrote:
The more I think about this the more I think the foam was just for insulation. The built-in cooler just aft appears to be wrapped with the same stuff and I'm guessing that without the foam you would get lots of moisture condensing on the underside of the seat and dripping onto the quarter-berth and its occupant.
----- Original Message -----
From: "Dave Scobie" <scoobscobie@gmail.com> To: "For and about Montgomery Sailboats" < montgomery_boats@mailman.xmission.com> Sent: Friday, April 18, 2014 1:10:53 PM Subject: Re: M_Boats: Is the foam under my starboard cockpit seat structural or for flotation?
that foam wasn't for flotation. to keep the M17 floating the entire space under the cockpit, including the lockers, and 1/2 the cabin would need to be full of foam.
the foam has me puzzled as Jerry preferred(s) balsa core to strength the decks and transom. about 1/4" balsa on the seats would be enough.
i'm wondering if the foam you see there was added by a past owner?
Jerry needs to jump in here about the layup schedule for the original M17 deck. my M17 has the 'new' deck design so i'm not able to provide a comparison when looking at SWEET PEA.
On Fri, Apr 18, 2014 at 10:39 AM, <swwheatley@comcast.net> wrote:
As noted before, I removed the slab of 1" green foam from the underside of my starboard cockpit seat. I assumed the foam was structural, but it has been suggested on another forum that the foam was for flotation. That makes some sense because a structural foam core on a small boat would not usually be 1" thick, but I am not aware that the M17 was ever touted as having positive flotation. The foam appears to have been factory installed before the deck was attached to the hull. Perhaps it was a custom option? Boat is a 1976, hull no. 215.
Any insight would be much appreciated.
----- Original Message -----
From: "Stanley Wheatley" <swwheatley@comcast.net> To: "montgomery boats" <montgomery_boats@mailman.xmission.com> Sent: Sunday, April 6, 2014 8:51:51 PM Subject: M_Boats: Behold the carnage
New to me M17 had delamination under the starboard cockpit seat due to some pretty big voids in the resin the core was supposed to be bedded in. Appears to be 1” foam core covered with 1 layer of 6 oz. fiberglass cloth. Any suggestions on what core I should use to replace it? I would prefer to use some kind of foam again but I’m not sure about the thickness. The available foam cores seem to thinner now days.
Thanks.
-- :: Dave Scobie :: former M15 owner - www.freewebs.com/m15-named-scred :: M17 #375 SWEET PEA - www.m17-375.webs.com
-- :: Dave Scobie :: former M15 owner - www.freewebs.com/m15-named-scred :: M17 #375 SWEET PEA - www.m17-375.webs.com
First, it clearly was installed during initial construction. Second, it appears to be all over the place: under the cockpit floor, under the cockpit seats, under the quarter berth and under the v-berth. Third, there does not appear to be any other reinforcement or core in these areas and they clearly need something. Fortunately, it only seems to have delaminated in the one spot under the starboard cockpit seat. Which brings me back to my original question: what should I use to replace it? I am leaning toward Core-Cell A500 and I'll probably use 1/2" just to be safe. Any other suggestions? -----Original Message----- From: GILASAILR@aol.com Sent: Friday, April 18, 2014 11:54 PM To: montgomery_boats@mailman.xmission.com Subject: Re: M_Boats: Is the foam under my starboard cockpit seat structuralor for fl... I 'think' my seat at the location in discussion here has a balsa core as do all the horizontal surfaces on the deck (coaming 'cap' and companionway sliding hatch excepted) - probably PO's version of insulation. My boat is a 1980 # 316 FWIW. Old deck and interior. You know - the collectible ones! Have a great day, Go Sailing! GO In a message dated 4/18/2014 11:07:02 A.M. US Mountain Standard Time, scoobscobie@gmail.com writes: the foam in your prior picture does look 'low density' so the insulation idea seems logical. i've inspected a couple of the 'old deck' M17s (when i was looking to buy a M17 and to help others) ... i can't say 100%, but i think the 'old deck' M17s don't have any core in that location. don't hold me to this, i honestly can't remember. (Jerry?) there is core in the locker lids ... i inspected a boat where the locker lid core was completely rotten. On Fri, Apr 18, 2014 at 11:23 AM, <swwheatley@comcast.net> wrote:
The more I think about this the more I think the foam was just for insulation. The built-in cooler just aft appears to be wrapped with the same stuff and I'm guessing that without the foam you would get lots of moisture condensing on the underside of the seat and dripping onto the quarter-berth and its occupant.
----- Original Message -----
From: "Dave Scobie" <scoobscobie@gmail.com> To: "For and about Montgomery Sailboats" < montgomery_boats@mailman.xmission.com> Sent: Friday, April 18, 2014 1:10:53 PM Subject: Re: M_Boats: Is the foam under my starboard cockpit seat structural or for flotation?
that foam wasn't for flotation. to keep the M17 floating the entire space under the cockpit, including the lockers, and 1/2 the cabin would need to be full of foam.
the foam has me puzzled as Jerry preferred(s) balsa core to strength the decks and transom. about 1/4" balsa on the seats would be enough.
i'm wondering if the foam you see there was added by a past owner?
Jerry needs to jump in here about the layup schedule for the original M17 deck. my M17 has the 'new' deck design so i'm not able to provide a comparison when looking at SWEET PEA.
On Fri, Apr 18, 2014 at 10:39 AM, <swwheatley@comcast.net> wrote:
As noted before, I removed the slab of 1" green foam from the underside of my starboard cockpit seat. I assumed the foam was structural, but it has been suggested on another forum that the foam was for flotation. That makes some sense because a structural foam core on a small boat would not usually be 1" thick, but I am not aware that the M17 was ever touted as having positive flotation. The foam appears to have been factory installed before the deck was attached to the hull. Perhaps it was a custom option? Boat is a 1976, hull no. 215.
Any insight would be much appreciated.
----- Original Message -----
From: "Stanley Wheatley" <swwheatley@comcast.net> To: "montgomery boats" <montgomery_boats@mailman.xmission.com> Sent: Sunday, April 6, 2014 8:51:51 PM Subject: M_Boats: Behold the carnage
New to me M17 had delamination under the starboard cockpit seat due to some pretty big voids in the resin the core was supposed to be bedded in. Appears to be 1” foam core covered with 1 layer of 6 oz. fiberglass cloth. Any suggestions on what core I should use to replace it? I would prefer to use some kind of foam again but I’m not sure about the thickness. The available foam cores seem to thinner now days.
Thanks.
-- :: Dave Scobie :: former M15 owner - www.freewebs.com/m15-named-scred :: M17 #375 SWEET PEA - www.m17-375.webs.com
-- :: Dave Scobie :: former M15 owner - www.freewebs.com/m15-named-scred :: M17 #375 SWEET PEA - www.m17-375.webs.com
participants (2)
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GILASAILR＠aol.com -
Stanley Wheatley