There was a member of the email list a few years ago that had a 37+ who had some damage on his transom at the backstay attachment points. I think he had two hydraulic rams (one on each side for a split backstay) and at some point in the past someone had put way too much pressure on the hydraulics, perhaps before he owned it. He had to do some sort of repair as a result.
We have the paired hydraulic rams on our 37/40's split backstay and have had no issues. It doesn't hurt to slack the back stay off some when leaving the boat if you think of it. That's one of the things on my 'leaving the boat' checklist. Ken H. On Tue, 5 Nov 2019 at 16:56, David Knecht via CnC-List < cnc-list@cnc-list.com> wrote: > Interesting discussion about backstays. My 34+ has developed a series of > cracks in the gelcoat below the backstay attachment point on both sides of > the transom. I have the split backstay with pulley adjustment. I am not > sure when the cracks started, but they have gotten worse. Not through the > hull (no water leakage) but a surveyor and a fiberglass guy both suggested > I do something about it. Both sides have stainless steel backing plates > which I would have thought sufficient. One of the problems with the split > backstay/pulley adjustment is that I have no idea how much force I am > putting on the hull when I crank the backstay. I did not think it was > possible I could be doing damage, but something has happened. Anyone else > had this problem? > > In any event, it is being fixed this winter by repairing the cracks and > adding a glassed in support tying the transom to the hull. Dave > > S/V Aries > 1990 C&C 34+ > New London, CT > > > On Jan 4, 2017, at 9:02 PM, Chuck S via CnC-List <cnc-list@cnc-list.com> > wrote: > > FWIW, I looked into splitting the backstay for my 34R and determined I > would forgoe using U Bolts and substitute a length of Stainless Tee section > from McMaster Carr. That would allow me to shape the Tee bar into a proper > tang with one hole for the backstay and six to eight bolts through the > transom. It's easy to beef up the transom area by adding layers of glass > inside and spread the load further using a large aluminum backing plate. > When I priced the 10,000# rated pulley needed for the backstay and faced > hiring a rigger to shorten the backstay, I put the project into a folder > marked, "If I ever win the lottery". > > > The point of all this is to encourage those who want the boat. > Reinforcing is a nice winter project; remove the U-bolts, apply layers of > glass, add backing plates, make it better. > > > Chuck > Resolute1990 C&C 34R > Broad Creek, Magothy River, Md > > On January 4, 2017 at 7:04 PM Josh Muckley via CnC-List < > cnc-list@cnc-list.com> wrote: > > Follow the link below. Find a transom picture - there are many. The > humps on port and stbd top corners are the attachment points for the > hydraulics. On Michael Cotton's boat, Blue Pearl, there was only a single > hydraulic piston which attached on the port side. This piston pulled down > against a turning block attached to the backstay which transfered half the > load to the starboard side. The humps have a horizontal portion where a > standard u-bolt extends through. It is hard to tell but the load > distribution has relatively limited surface area. Even if it had (and it > doesn't) a custom strongback designed to fully engage the horizontal > section of the hump, it is still a considerable amount of point loading. > I've visualized all manner of correction for this perceived weakness but > continue to fail to take action. > > It is my belief that while a better design is/was possible, only one boat > has had a failure. Evaluating that single known failure on that boat shows > that it is also possibly the only boat with a signal hydraulic ram. Maybe > a hangup in the turning block caused an unequal distribution of the load > resulting in the failure. > > I watch mine and consider pursuing the reinforcement from time to time. > > https://plus.google.com/117078816966198897128/posts/2qzHVRgqeVz > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > On Jan 4, 2017 2:21 PM, "Mark Baldridge via CnC-List" < > cnc-list@cnc-list.com> wrote: > > Tom, > > I looked at the boat about when the photos were taken and prior to the > listing going up. The backstay is currently disconnected while the > hydraulics are out being rebuilt. They are currently tied off to the stern > pulpit. If you look close at the main picture you can see attachment point > next to where the hydraulic line exits the deck. > > I assume that this is standard. > > Thanks, > Mark > > On 1/4/2017 1:55 PM, Tom Buscaglia via CnC-List wrote: > > Hey Mark > > I took a look at Ogopogo, the 37+/4- in Fairhope,online. Since this > string started with questions about the back stay on these boats, I was > wondering about the set up on the one you're looking at. They seems to > have been relocate inboard from their original location on the transom. > I'm curious as to why this was done. Any idea or explanation given? > > GL with the purchase...I am a huge fan of the 37+/40! > > Tom B > > ------------------------------ > > Message: 2 > Date: Tue, 3 Jan 2017 21:17:34 -0500 > From: Mark Baldridge <jmbaldri...@gmail.com> <jmbaldri...@gmail.com> > To: cnc-list@cnc-list.com > Subject: Re: Stus-List C&C 37+ Backstay Inspection/Improvements > Message-ID: <6afc5ca3-ac75-7fc3-a725-64d0a88e0...@gmail.com> > <6afc5ca3-ac75-7fc3-a725-64d0a88e0...@gmail.com> > Content-Type: text/plain; charset="windows-1252"; Format="flowed" > > Good luck Bruce! > > Our survey is the 10th of January on the 1989 37/40+ out of Fairhope, > AL. hull #30 (ex Dakota). Hoping for a good pass as well! > > Mark Baldridge > ~~~~~~~~~~~~~~~~~~~~~~_/) > '75 C&C35 MKII "The Edge" > Surf City, NC > > Tom Buscaglia > SV Alera > 1990 C&C 37+/40 > Vashon Island WA > (206) 463-9200 > www.sv-alera.com > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you wish > to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > > > _______________________________________________ > > 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 > >
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