How to scale up a boat design?
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In several of my articles about designing and building small boats, I mention that I have a 12ft or 14ft version in the works for one of the boats that I am actually writing about in that story. When you stop to think about it, I would imagine that any hull could be scaled up or down if someone was inclined to go about the task, and had a need for a boat of that particular size. In the cover letter to my 14 foot Nuthatch, I state that the "Nuthatch hull" could be stretched out to the mid twenty's. It could probably be lofted up to the size of a container ship, but I don't think I have ever seen a thousand foot long ship that could be described as a Pram, or whether it would even be feasible.
Back in the real world of small boat design, things are easier to deal with in the scale of 6 to 20 feet. As I said earlier, I have finished models of hulls from the same family group, in more than one length. The most numerous is the Nuthatch Pram family, with completed models from 8-14ft, and finished real world boats at 8 and 10 feet. The 12ft version will go into the construction phase this fall or winter, depending on requests from readers such as yourself. When I finish up the double ended O&P Pod, I will most likely start on the 12ft Granville Bay. I don't know if I will have that boat done by the time the Port Townsend Wooden Boat Festival comes around or not. This winter I will start the design on the 16ft Granville Bay as a mostly sailing boat, but will need a bigger shop to build it in, so it may be a while before I get around to building it or any other design in the 14ft plus range.
The 8ft Nuthatch Pram was my first stab at boat design, and I still like to take the prototype down to my local lake and mess around in it sailing or rowing it. The 10ft version is a blast to sail, has more room for gear and people than the 8ft hull. The 12ft hull will have even more capacity to carry things, and when I set the 14ft hull next to it, I start thinking of sail camping, and the Texas 200.
With the Nuthatch family I tried to match the visual appearance of one hull to the next. I didn't just add a proportional number to a measurement on the smaller hull to get the bigger one. There is a bit of variance in the widths and heights of all the panel members. Once I got a model that looked right to me visually and had the right amount of freeboard for safety and oarlock height, the rest of the time was spent getting the panel corners to line up and fit. Also to make sure that the panels could be laid out on standard sheets of plywood. But as the lengths and widths of the hulls increase, the number of sheets and the thickness's of the plywood also increased, as well as the cost. So does the cost of the extra epoxy, fiberglass tape and cloth, number of stainless screws, amount of paint and stain, and so on to a point of diminishing returns. (See the next to last paragraph)
I believe the trend to smaller family boats will be a result of the increased price of gas to haul a large boat to a nearby ramp to launch it. It may be cheaper to stack two or three 8-10ft, 80-90 pound boats on a small trailer (then carried to the water's edge) and let each family member be the captain of their own vessel. In my past days of sea kayaking, I saw that couples tended to get along better in singles rather than doubles's. Marriages seemed to last longer when they could paddle their separate ways, and it was a lot friendlier around the camp fire at night for the rest of us. Remember, there is more room in an 8ft Pram than a 16ft sea kayak for camping gear.
Time to get back to what I started out writing about. I have found that it is much easier to design hulls in the 14-16ft range. At that length, you have enough size to work on the overall shape of the hull. By that I mean that the curves can be stretched out more, and the depths of the arcs increased. With an 8 foot hull like the first Nuthatch Pram, there wasn't
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Back in the real world of small boat design, things are easier to deal with in the scale of 6 to 20 feet. As I said earlier, I have finished models of hulls from the same family group, in more than one length. The most numerous is the Nuthatch Pram family, with completed models from 8-14ft, and finished real world boats at 8 and 10 feet. The 12ft version will go into the construction phase this fall or winter, depending on requests from readers such as yourself. When I finish up the double ended O&P Pod, I will most likely start on the 12ft Granville Bay. I don't know if I will have that boat done by the time the Port Townsend Wooden Boat Festival comes around or not. This winter I will start the design on the 16ft Granville Bay as a mostly sailing boat, but will need a bigger shop to build it in, so it may be a while before I get around to building it or any other design in the 14ft plus range.
The 8ft Nuthatch Pram was my first stab at boat design, and I still like to take the prototype down to my local lake and mess around in it sailing or rowing it. The 10ft version is a blast to sail, has more room for gear and people than the 8ft hull. The 12ft hull will have even more capacity to carry things, and when I set the 14ft hull next to it, I start thinking of sail camping, and the Texas 200.
With the Nuthatch family I tried to match the visual appearance of one hull to the next. I didn't just add a proportional number to a measurement on the smaller hull to get the bigger one. There is a bit of variance in the widths and heights of all the panel members. Once I got a model that looked right to me visually and had the right amount of freeboard for safety and oarlock height, the rest of the time was spent getting the panel corners to line up and fit. Also to make sure that the panels could be laid out on standard sheets of plywood. But as the lengths and widths of the hulls increase, the number of sheets and the thickness's of the plywood also increased, as well as the cost. So does the cost of the extra epoxy, fiberglass tape and cloth, number of stainless screws, amount of paint and stain, and so on to a point of diminishing returns. (See the next to last paragraph)
I believe the trend to smaller family boats will be a result of the increased price of gas to haul a large boat to a nearby ramp to launch it. It may be cheaper to stack two or three 8-10ft, 80-90 pound boats on a small trailer (then carried to the water's edge) and let each family member be the captain of their own vessel. In my past days of sea kayaking, I saw that couples tended to get along better in singles rather than doubles's. Marriages seemed to last longer when they could paddle their separate ways, and it was a lot friendlier around the camp fire at night for the rest of us. Remember, there is more room in an 8ft Pram than a 16ft sea kayak for camping gear.
Time to get back to what I started out writing about. I have found that it is much easier to design hulls in the 14-16ft range. At that length, you have enough size to work on the overall shape of the hull. By that I mean that the curves can be stretched out more, and the depths of the arcs increased. With an 8 foot hull like the first Nuthatch Pram, there wasn't
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Ship plans are drawn up to describe the shape of the three dimensional hull on a two ... Model Boat Plans Scale and Scale Accuracy.
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