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Fast delivery: Any thickness and almost any length, less than 5 ft wide, can be made with in 48 hours if it is rush order. Broken boats are a gold mine of information if you take the time and make the effort to take a camera with you !! Originally Posted by groper MP, provided each method can be executed equally well, it makes no difference. However, in practice, its better to do it in the way ADHOC`s drawing shows because if you do it the other way and overlapping the layers above the previous, you tend to get a void forming where the lap is, due to the next layer bridging the thickness difference of the previous layer. In the perfect world , for structural projects, I have a set of drawings from a naval architect and tolerate no variation from what is drawn.
I think though that such detail only comes into play in the highest end type of construction, for example aircraft or ultra light boats, etc.
Originally Posted by SamSam Technically, widest tab first is best as it leaves the secondary bond between the tabbing and hull and bulkhead skins with one continuous interface with no resin rich lines at each step of laminate transition.
Location: * strength of materials and not very complex Strange, not one suggests scientifically proven solutions. The true proceedure is written in the installation instructions , i looked and read and had to take time to really think about it before i understood . Location: Duluth, Minnesota If you feel its necessary Ad Hoc showed 2 different ways to do what you are talking about, however, as is usual in these types of threads folks tend to get overly academic and try to solve problems that really dont exist.
Originally Posted by Steve W If you feel its necessary Ad Hoc showed 2 different ways to do what you are talking about, however, as is usual in these types of threads folks tend to get overly academic and try to solve problems that really dont exist.
Location: Coastal Georgia My understanding of Gropers project is the hull panels are infused both sides at once on a flat table, the panels are cut to shape and then joined into each other to form the hull, vaguely like using sheets of plywood to make a stitch and glue hull. I say no, I think in this situation the inner skin performs one function and the tabbing performs another and you need both. Taping the joint first might be a little time consuming or difficult, but if the joint is not taped first and then it turns out it should have been, a little difficult and time consuming task will be replaced by a very difficult and very costly task.


I'd like to hear what Mr Groper thinks about all this discussion and what he decides to do.
The question is can the bulkhead tabbing take the place of, and perform the same functions as, the inner skin of the hull laminate.
Joining a panel with a plywood scarf or glass sandwich butt joint overtop of a bulkhead or deckbeam, as shown in your scketch, is bad engineering .
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Location: Italy (Garda Lake) and Croatia (Istria) Sorry mate, just enlarging the pics is not enough, because it is still the same picture with the same resolution. Originally Posted by daiquiri Sorry mate, just enlarging the pics is not enough, because it is still the same picture with the same resolution. Location: Hampshire UK Thanks for pics, as daquiri says a further out shot or two would help. If I am reading it right (Shot 2) there is effectively a cross beam shape ending there and the stress on that may be causing a little too much load resulting in the cracks. Location: Coastal Georgia I'm guessing its one of those flats boats, the splash well is in the background and the structure stuff is the supports for the poling platform. The one on the left looks like is a gelcoat stress crack, but the one on the right looks like it's deep enough to be in the laminate.
It would be helpful if you told use the make, model of this 4 year old boat, also how it's equipped (engine, options, etc.). It probable that the laminate is too thin in this area, for the loads being imposed on it, particularly considering it was built at the height of the economic down turn, where companies may have been cutting every corner they could to stay alive. If so cracks in that area are often from trailering with out a transom saver support between the lower unit and the trailer. Location: Italy (Garda Lake) and Croatia (Istria) It is hard to make evaluations from such small photos, but if one of the cracks is suspected to be more than just a gelcoat issue, then the other one should be treated the same way. The loads by the outboard are likely being transmitted symmetrically to both corners of the transom and the structure is symmetrical too. Location: Eustis, FL This is a pretty common place to see cracks on typical outboard equipped boats. Location: nc thank you all for the advice it is a 2010 savannah skiff with a 2008 f150trx yahama. Location: Italy (Garda Lake) and Croatia (Istria) What model of Savannah skiff is that? Originally Posted by pescaloco If so cracks in that area are often from trailering with out a transom saver support between the lower unit and the trailer. Other core materials cannot compare with Sing Core’s torsion box honeycomb foam core structural integrity, especially at up to one-tenth the weight of standard plywoods. Using these lightweight marine composite materials not only ensure the structural integrity that is so important to us as boat owners, but we can feel good about using an eco-friendly, sustainable material that will also reduce operation costs and toxic contamination.
In comparison to other lightweight foam core materials, like those used in the aerospace industry that test out at 10-20 PSI, Sing Core tests out at 660 PSI and can be modified for more strength per your specifications. To repair, you can easily cut out the damaged area, and replace with Sing Core replacement without compromising the structural integrity of your system. Getting a quote for your specialty product, is easy, thanks to our simple online order system.


Whenever I tabbed things, I always went widest tape last as it ended up a cleaner bit of work, leaving only one 'loose' edge of fiberglass nastys that would have to be cleaned up.
Folks like Derek Kellsal have been building foam cored boats much much longer than any of us (longer than almost anyone actually)with great sucess and im pretty damn sure he doesnt do anything more than the usual detail.
The only issue in the OP is whether the inner skin of the hull composite laminate should or should not be continuous when hull panel butt joints occur on the edge of a bulkhead. For this kind of evaluations, sharp pictures at least size 1024x768 pixels would be useful. In fact, the pictures you have enlarged have gotten blurred and do not reveal anything new respect to the original ones. At first glance the first shot looks like a gelcoat issue but the second looks like a little more reinforcing behind would be welcome.
The engine bounces and puts tremendous stress on the transom or splash well and deck interface.
Boat builders report composite materials have been flooding the marine industry for years, but tend to fail under rigorous testing or deteriorate over time. This is due to the internal cellular structure that is independent based on the torsion box grids.
I think that yes, you need to have a continuous inner hull skin and so you should tape the panel butt joints before the bulkhead is tabbed in place. There is rarely any need to do more than what has worked for decades in a similar situation as what you are doing. The question is can the bulkhead tabbing take the place of, and perform the same functions as, the inner skin of the hull laminate. And, again, it would also be necessary to see the big picture of the transom in order to understand what loads are present there, which are stressing the structure. I'm guessing the bulkheads are what gives shape to the hull and you don't want to lock the hull shape in with the butt joint tapes as then the hull fairness might be compromised.
The joint and everything else needs to be compatable with its surrounding area being the inner and out and core in between and that what you discribed is not the answer!!!
On carbon race boats that see abuse many times more severe on around the world races, flying off waves at 30 knots, rig and keel loads much larger than the typical cruiser, sometimes have bulkheads installed with NO tabbing! By reducing the overall weight of the high-performance marine vessel’s structure, Sing Core helps to increase sailing speed, save fuel costs, reduces carbon footprint and waste, allowing green minded mariners to enjoy sharing their love of the sea and water sports. If you have a tight budget, give us a call, we might have an alternative solution tailored to your needs. Is there any way to do them both at once, such as wet out the tape and then install the bulkhead and tabbing before the tape has set? Ive seen this time and again from many builders and amazingly, for the most part the only failure would be the polyester to plywood interface or else deck leaks had caused the plywood to rot out between the tabbing.



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