I am just finishing the rebuild of the mast step on my 30-1. It was not high tech at all like the later boats, using cross-wise stringers made of plywood which had fiberglass on the top and sides but not on the bottom where the water gathers. After 36 years and a couple of repairs, they were soggy! Deciding that letting water sit in the deep part of the sump, where only a small bilge pump would fit and when clogged up with some gunk or pieces of delaminating plywood, would fail, requiring the removal of the mast to replace, I dumped three quarts of West epoxy down there to create a small slope from front to rear and get the water back into the area where an installed bilge pump is accessible. I did it in stages with slow hardener, which avoided the heat problem and then covered it with a layer of cloth/mat. Three new stringers, each made of two sandwiched ¾ inch UHMW (almost as hard as the red stuff, but easier to machine) now sit on top of that new sloped area to keep it dry. I put a piece of 2” PVC pipe around the one keel bolt to allow access. I hope it will outlive the rest of the boat.
Gary Nylander 30-1 #593 From: CnC-List <cnc-list-boun...@cnc-list.com> On Behalf Of Ken Heaton via CnC-List Sent: Wednesday, April 11, 2018 9:54 AM To: cnc-list <firstname.lastname@example.org> Cc: Ken Heaton <kenhea...@gmail.com> Subject: Re: Stus-List Mast step Stringers " Any thoughts on injecting epoxy? " It will take a lot of epoxy if the floors are mostly hollow. And beware of heat if a large amount of epoxy is curing in an enclosed space. Perhaps the slowest possible hardener in the mix? I am not an expert... Ken H. On 11 April 2018 at 10:48, Brian Fry via CnC-List <email@example.com <mailto:firstname.lastname@example.org> > wrote: Thank you Ken.. Very helpful. I will take another look. I do have an access hole drilled thru one of the stringers to be able to torque one of the bolts, If I recall it is not hollow. There are also bilge drain holes from bay to bay, again they are not hollow. I agree the drawings show no material inside, but then what would the mast step plate be screwed to? My concern is that they are bulging. I take it yours don't have the bulging issue? Any thoughts on injecting epoxy? Thanks again. Message: 4 Date: Wed, 11 Apr 2018 06:27:52 -0300 From: Ken Heaton <kenhea...@gmail.com <mailto:kenhea...@gmail.com> > To: cnc-list <email@example.com <mailto:firstname.lastname@example.org> > Subject: Re: Stus-List Mast step stringers Message-ID: <caabfp6tcwvtcrwge5y3x_1k3t21an8xbkdf6xqzjy9rkkuy...@mail.gmail.com <mailto:caabfp6tcwvtcrwge5y3x_1k3t21an8xbkdf6xqzjy9rkkuy...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" Hello Brian, I would be very surprised to find there was any wood inside the 'stringers' on a C&C 37/40. There is no mention of wood used in any part of this boat's construction anywhere (except in the sole, in bulkheads and cabinetry) in any documents I have see for these hulls. I was sure the `stringers` were either completely hollow or there was perhaps foam inside, but only to hold their shape while they are tabbbed to the hull on initial construction. One `stringer` just aft of the two that support the mast step, has a large hole drilled in the top to access a keel bolt. It is completely hollow. Here is a link to the construction drawing for that hull: Here: https://drive.google.com/file/d/0B7X4Y5iVFYAKYTJxRDJBc3BvLWM/ <https://drive.google.com/file/d/0B7X4Y5iVFYAKYTJxRDJBc3BvLWM/view?usp=sharing> view?usp=sharing and here: https://drive.google.com/file/d/0B7X4Y5iVFYAKcDd4ZlhWNGZzdmM/ <https://drive.google.com/file/d/0B7X4Y5iVFYAKcDd4ZlhWNGZzdmM/view?usp=sharing> view?usp=sharing Ken H. On 10 April 2018 at 22:37, Brian Fry via CnC-List <email@example.com <mailto:firstname.lastname@example.org> > wrote: > 1993 37/40. > Redoing the rod rigging, mast is down. Removed the aluminum mast step to > media blast and powder coat. > There are three `stringers` the mast step sits on. The forward and aft > stringers,which the step is bolted to, are bulging. Tapping on them reveals > a delamination inside. > I am thinking this is caused by forces from the adjustable mast crushing > the laminate wood inside. The bay this is in is too high to be caused by > water intrusion. > Anyone else experiencing this? > The plan is to drill holes and inject epoxy, then bolt on a suupport piece > of 1/2" aluminum across the face, bolted into the solid parts of the > stringer. > Any input is welcome. > > S/V La Neige > 1993 C&C 37/40 XL > Havre de Grace , MD > FB blog : thenext14years > Brian and Manon > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/20180411/f086594e/attachment-0001.html> ------------------------------ Message: 5 Date: Wed, 11 Apr 2018 09:20:27 -0300 From: Ken Heaton <kenhea...@gmail.com <mailto:kenhea...@gmail.com> > To: cnc-list <email@example.com <mailto:firstname.lastname@example.org> > Subject: Re: Stus-List Mast step stringers Message-ID: <caabfp6tplokmqxxsubhrhwfnwrydpgws7ws9pevyadblr06...@mail.gmail.com <mailto:caabfp6tplokmqxxsubhrhwfnwrydpgws7ws9pevyadblr06...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" Part 2 Hi Brian, The 'stringers' you refer to are the Structural Floors I think. Those drawings can be downloaded from the links provided. They are big, about 3' by 4' so it is best to download them and view them in a pdf viewer that will let you zoom way in. There is a detail on those drawings as follows: STRUCTURAL FLOORS 1. 2 LAYERS KEVLAR HYBRID 2. 1 LAYER KEVLAR HYBRID ON TOP ONLY 3. 3 LAYERS OF 18oz./1oz. FABMAT Here is a link to that detail from the Construction Drawing: https://3.bp.blogspot.com/-ZlxOeqGWYe0/Ws39SyZcQGI/AAAAAAAB1fc/0fUCvVSqzqYEHiiwFZ67HeLvKyk0Lsr1gCLcBGAs/s1600/Construction%2BDetail%2Bfor%2Bthe%2B37%252B%2BMay%2B28%252C%2B1988-1.jpg Ken H. _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray