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by jacquesmm
Mon Dec 11, 2017 11:23 am
Forum: Builder's Power Boats
Topic: The Plytanic 2.0 - FS17 Build
Replies: 61
Views: 1006

Re: The Plytanic 2.0 - FS17 Build

I am the opposite: very optimistic about gaps. I always think in terms of fiberglass boatbuilding.
The plywood is nice core that provides stiffness and add strength but in a large boat, most of the strength comes from the glass,
by jacquesmm
Mon Dec 11, 2017 11:20 am
Forum: Power Boats
Topic: LB26 Lamination question
Replies: 10
Views: 158

Re: LB26 Lamination question

Sorry for the comment about 1st time boat builder, I should have said not familiar with fiberglass techniques. I have seen production boat hulls fail because workers took shortcuts with wide fabric overlaps. In one boat, they systematically ended the fabric just at the keel because ti was easier. Th...
by jacquesmm
Sun Dec 10, 2017 7:15 pm
Forum: Power Boats
Topic: LB26 Lamination question
Replies: 10
Views: 158

Re: LB26 Lamination question

At keel, chine, bow, transom, everywhere there is a seam, the wide fabric layers overlap. For example, the port side of the bottom fiberglass wide fabric goes over the keel and the starboard side of the bottom also goes over the keel creating a thick overlap. No need to complicate by counting the la...
by jacquesmm
Sun Dec 10, 2017 4:59 pm
Forum: Builder's Power Boats
Topic: The Plytanic 2.0 - FS17 Build
Replies: 61
Views: 1006

Re: The Plytanic 2.0 - FS17 Build

Rocker on the transom? Rocker is longitudinal, I suppose you mean rocker as I show in some of my HowTo files. 1/8 may not be enough. :) In the PH16 and PH18, designed 25 tears ago, I put 1/2" of rocker in the plywood. I don't discuss it often but have said it a couple of times over the years. I put ...
by jacquesmm
Sun Dec 10, 2017 3:12 pm
Forum: Power Boats
Topic: LB26 Lamination question
Replies: 10
Views: 158

Re: LB26 Lamination question

That is not the lamination schedule I list in my building notes. Why the change?

What you list would be fine for a 100' yacht.
by jacquesmm
Sun Dec 10, 2017 3:11 pm
Forum: Builder's Power Boats
Topic: Reefie's LB26
Replies: 113
Views: 2862

Re: Reefie's LB26

Any boat can be built without buoyancy foam but I suppose you want to know if she will float? Maybe, it depends on the volume of the closed compartments you describe.
by jacquesmm
Sun Dec 10, 2017 3:08 pm
Forum: Questions before purchasing the plans and announcements..
Topic: GS28OM...another non-artist concept.
Replies: 4
Views: 102

Re: GS28OM...another non-artist concept.

What ever one thinks of the aesthetics, the problem here is displacement. All that superstructure and weight on a GS28 hull will raise the waterline well above the step chine almost to the bow. Hulls are designed for a given displacement and especially on planing boats, this is very important. The b...
by jacquesmm
Sat Dec 09, 2017 11:12 am
Forum: Builder's Power Boats
Topic: The Plytanic 2.0 - FS17 Build
Replies: 61
Views: 1006

Re: The Plytanic 2.0 - FS17 Build

Yes it is more than most gaps but it is not a big deal. If you think that you can solve the problem by trimming the spots where the panels push against each other, do it. If not, later when you fiberglass the inside, add a layer or two of biaxial tape along that seam, over the gap. Also, things may ...
by jacquesmm
Fri Dec 08, 2017 4:23 pm
Forum: Builder's Power Boats
Topic: The Plytanic 2.0 - FS17 Build
Replies: 61
Views: 1006

Re: The Plytanic 2.0 - FS17 Build

Looking at your previous picture with the panels flat on the ground, the picture with the jugs on the tape splice, I see a flat line along the keel side curve. That is probably a large part of the gap. http://gallery.bateau2.com/albums/userpics/10004/flat.jpg IMHO this is an acceptable gap. I would ...
by jacquesmm
Thu Dec 07, 2017 1:30 pm
Forum: Power Boats
Topic: PC22 Question for Jacques
Replies: 1
Views: 68

Re: PC22 Question for Jacques

This question came from Steve in the UK and copied to the forum by Jeff (thank you), Steve, there are a good number of things to consider, first the buoyancy. What you describe would only work if the superstructure is extremely light. Even a wider PC22 will still have much less volume than let's say...