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by jacquesmm
Mon Jun 06, 2022 4:07 pm
Forum: Power Boats
Topic: LB26
Replies: 526
Views: 28232

Re: LB26

I prefer to install the framing on the rough glass and fair later. Less delamination risks. For the supports in your picture, build some braces spaced every 3' or 90 cm max. spacing. The exact shape is irrelevant. Some people like to shape them as fishing rod holders, others us them to make storage ...
by jacquesmm
Mon Jun 06, 2022 4:04 pm
Forum: Power Boats
Topic: OD16 Keel side
Replies: 4
Views: 211

Re: OD16 Keel side

Disregard the step at the chine. I first designed this boat with a step but later changed the design to a slanted chine. I don't know how that picture found it's way back in the notes, I will check it and correct the notes but there is no step at the chine. You can build the boat as in the "12 ...
by jacquesmm
Fri Jun 03, 2022 10:05 am
Forum: Power Boats
Topic: GT27 Question
Replies: 1
Views: 156

Re: GT27 Question

You can scale that boat by 10% in all 3 dimensions. To change only one or two dimensions is much more complicated.
by jacquesmm
Fri Jun 03, 2022 10:04 am
Forum: Builder's Power Boats
Topic: Capturing JM's recommenations?
Replies: 2
Views: 165

Re: Capturing JM's recommenations?

When you scale up and down, my 10% limit does not require any changes to the scantlings but, in many cases, I recommend extra glass layers when the builder installas a larger engine.
I would take it case by case.
by jacquesmm
Fri Jun 03, 2022 10:02 am
Forum: Power Boats
Topic: Making outboard dory 18 10% larger
Replies: 18
Views: 627

Re: Making outboard dory 18 10% larger

It can be done but read what Barraman says about it: a boat scaled up by 10% in 3D is 30% larger: 1.1^3.
I would scale all dimensions and do it in metric.
Also, check how scaled panels will fit on standard plywood sheets: you will need much more plywood than 10% extra.
by jacquesmm
Fri May 27, 2022 11:59 am
Forum: Power Boats
Topic: CT22 - Center console Cat 22 - Question
Replies: 45
Views: 2392

Re: CT22 - Center console Cat 22 - Question

Let's first discuss the material: I prefer to stick to plywood. Strip planking is not as strong. It is fine for pretty kayak but not for a hull that may slam in bad weather.. Understand that we use the plywood as the core, the strength comes from the skins. All other points can be addressed if you a...
by jacquesmm
Thu May 12, 2022 2:57 pm
Forum: Small Boats
Topic: Centre of Lateral Resistance
Replies: 9
Views: 504

Re: Centre of Lateral Resistance

Everything is already in place, you can't change much but no changes may be needed. As a starting point, I would try to get the sail center about 10% aft of the CLR. You may be close. I would make a sail from cheap polyethylene tarp, glued. It is cheap and fast to assemble. You can play with the sai...
by jacquesmm
Thu May 12, 2022 10:21 am
Forum: Small Boats
Topic: Centre of Lateral Resistance
Replies: 9
Views: 504

Re: Centre of Lateral Resistance

Well before computers could do it, we used to cut out the lateral area from cardboard and balance it on the tip of a pencil. It is good enough for what you do. Better, today, draw that same surface in CAD and get the center of area. I would do it for you but the FB11 is not my design. The FB11 is no...
by jacquesmm
Wed May 04, 2022 1:02 pm
Forum: Questions before purchasing the plans and announcements..
Topic: CX25
Replies: 3
Views: 273

Re: CX25

Please look in the Power boats section and see the very long thread from Peter from Curacao. It will answer many of your questions. Since Peter lives in the Caribbean, he used his boat there, no problem. If you are based in the US and want to cross to the Bahamas and go further down, I would not ant...
by jacquesmm
Thu Apr 28, 2022 7:41 pm
Forum: Power Boats
Topic: DE 27.5
Replies: 88
Views: 4819

Re: DE 27.5

Yes, thank you Fuzz.
The 12 oz. is easier to wet out and will absorb less resin. My first choice was 3 layers of 12 oz.
I don't know where the 4 layers came from, maybe about someone who mentioned a larger engine or a larger scaled boat.