No worries...there's no balsa with any holes through it in my M17 (#38) - no balsa at all, that I'm aware of. Cabin reinforcement fore and aft of chainplates and under mast step is glassed-in half-tubes, as is fore-deck reinforcement. Cockpit floor is foam, starboard cockpit locker lid is I assume foam also. Port locker lid was some kind of previous owner hack job of foam, which I replaced with some epoxy-sealed plywood (there's a thread on the list some time back on that). Thanks for the history on the Balboa hull and the Montgomery trim ballast innovation...I was wondering what the hump just forward of the v-berth bulkhead on mine was for. I had an Ensenada 20 briefly, same hull as Balboa; she did have a nice volume in the stern, now I know why. cheers, John On 04/16/2019 09:53 PM, jerry@jerrymontgomery.org wrote:
Just keep the water out of the balsa!
-----Original Message----- From: John Schinnerer Sent: Tuesday, April 16, 2019 8:26 PM To: montgomery_boats@mailman.xmission.com Subject: Re: M_Boats: M15 hull/deck joint
Great, thanks. Mine might just be some age of the sealant, like in the write-up - thanks Howard for the write-up! Or, it might be the winch bolt holess...will try that first. I've bedded various items topsides with butyl tape and ended several small oozing leaks, but haven't done the winches yet.
cheers, John
On 04/16/2019 08:03 PM, Dave Scobie wrote:
John:
Here is a link to MSOGphotosite that shows the M17 aluminum toe rail setup -
http://msogphotosite.com/Scripts/StoryTechnical/storytechnicaldetail.php?id=...
The overlap in the joint is much smaller but very strong because of the aluminum extrusion. Looking at the above link's drawings you can see how much less overlap there is. For this reason some of these 17s have leaks if the joint is damaged (VERY rare). Still super strong and not going to let the deck come off the hull!
:: Dave Scobie :: M6'8" #650 :: SV SWALLOW - sv-swallow.com :: former owner M17 #375 SWEET PEA - m17-375.com :: former owner M15 #288 SCRED - www.freewebs.com/m15-named-scred/
On Tue, Apr 16, 2019, 7:55 PM John Schinnerer <john@eco-living.net> wrote:
Thanks Dave,
What about the older M17s with aluminum extrusion? There are certainly lots of screws along the hull-deck joint. What I can't tell is how much overlap etc. and how it was originally sealed. Mine seems quite tight, except there is one place on port side just about amidships (just aft of where the cockpit starts) where, if there's a lot of water along the rail and over that joint (heavy rain, washing the boat, etc.) a small amount of water runs down the inside of the hull. It could be the winch mount leaking, so I will bed that and see. But still curious about the older M17 joint.
cheers, John
On 04/16/2019 06:13 PM, Dave Scobie wrote:
Good discussion about possible places a leak can result in water getting into the cabin & bilge Burt.
The M15, all Sages (17, 15, SageCat) and the M17s with teak toe rails have a bulletproof hull/deck joint. No weak tiny seam and no flimsy PVC. See picture attached/below. (Pic shows a Sage 17 section as Jerry designed the joints on all the boats - Sage 17's is even stronger as it is carbon fiber!)
:: Dave Scobie :: M6'8" #650 :: SV SWALLOW - sv-swallow.com :: former owner M17 #375 SWEET PEA - m17-375.com :: former owner M15 #288 SCRED - www.freewebs.com/m15-named-scred/
On Tue, Apr 16, 2019, 9:45 AM Burton Lowry <burtonlowry7@gmail.com> wrote:
However, the insidious ones for us have usually been the hull to deck
joint. The outside seal would have failed, allowing water to sit against the joint under the rub rail, and the inside looked perfectly sealed, as it was resin and tape, but not gel coated. The water could then seep through all along the joint in very small amounts, but would eventually collect in the bilge.
Burt
-- John Schinnerer - M.A., Whole Systems Design -------------------------------------------- - Eco-Living - Whole Systems Design Services People - Place - Learning - Integration john@eco-living.net - 510.982.1334 http://eco-living.net http://sociocracyconsulting.com
-- John Schinnerer - M.A., Whole Systems Design -------------------------------------------- - Eco-Living - Whole Systems Design Services People - Place - Learning - Integration john@eco-living.net - 510.982.1334 http://eco-living.net http://sociocracyconsulting.com