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It is called the frame view as this is the view that is used to "pick" the frames from. That is to say it is the view which you can create patterns for the frames or building forms for your boat.
If you know the size of the stock of the building frames which should be on the boat plans , and you have the outline of the frames from the frames view, it becomes an easy task to create patterns for your frames. Each view has specific lines which need to be lofted in order to create an accurate view of the boat.
Assuming we are lofting a round bilged boat, the profile view needs to have 5 items lofted. The buttock lines, the sheer line, the profile line, the transom line and the stem line. Some designers combine the profile line and the stem line, however they are typically not integrated as the stem of the boat needs to be transformed into a frame member unless you are building a stitch and glue hull.
So let's define what each profile view line is. The sheer line shown in green is the line which describes the point at which the hull ends. At this line either the boat is terminated with a gunwale or the deck begins. If there is a deck it is also lofted out as it will need support members. The profile line shown in blue is the bottom of the boat hull. There is a distinction between the bottom of the hull and the bottom of the boat. There are items which extend past the hull bottom such as skegs and keels.
Though these need to be lofted out for the building process, they are not technically part of the hull lofting. These parts of the boats need not be described in the lofting table, though you may see them there as part of the designers convenience. Typically they are described in the boat plans. The stem line also shown in blue from first frame forward is the curve described in the table of offsets which specifies the curve of the stem from some given point on the profile line to the sheer line.
The designer will give enough points in the table of offsets to accurately manufacture a stem frame or what is more commonly simply called the stem. The buttock lines shown in Red are lines which when viewed from the profile view appear to be slices of the hull which are parallel to the centerline of the hull. These points in conjunction with the waterlines give enough information to fair all the curves.
The Transom line shown in Yellow shows you the rake of the transom as well as a perspective which allows you to "extend" the transom if it does not mount parallel to the rest of the boats frames. This also assumes that your boat is not a double ender or a boat with two stems. Because the plan view is a different perspective, it stands to reason that we will be lofting different lines or in some cases, the same lines from a different perspective.
Consider the sheer line. The sheer line is viewed in all three perspectives, the plan view, profile view and the form view. However, because we are observing the boat from three different planes of view, the information given from the sheer plotting in each perspective will give us different information. In the Plan view, the plot of the sheer line will show us how wide the boat is at the sheer line, in the profile view, the sheer line will show us how deep the boat is from the gunwales to the profile or the bottom of the boat.
Finally, in the frames view we will see the compound curve from the stem to the transom or far stem. The lines of the plans view are as follows:.
The water lines, the water lines shown in the graphic in purple act much as the buttock lines only in a different perspective. The waterlines slice the boat from the bottom to the top. Lofting the waterlines allows you to ensure that the hull has no bulges or hollows at any intersection of the hull from the gunwale lines to the bottom of the boat. Using the term water line is a bit misleading. In reality, an actual waterline will depend on the amount of displacement not only of the hull but the weight of the items in the boat at the time.
As for them being paralell, that again will depend on the dispersement of weight within the boat. For the purpose of lofitng, it is important to have mesuremenst from some controlled and imovable base line, so in lofting, the waterlines are actually lines moving up or down if the boat is being lofted upside down the hull from the baseline. As discussed, the sheer line is lofted which Small Boat Construction Plans Co will give you the breadth of the hull at any given point. Finally, if your boat has a transom, the transom lines will also be lofted in this view showing the length of the hull at both the sheer line and bottom of the hull as well as the transom breadth at any given waterline.
If the transom sits at a 90 degree angle with no rake, these there will only be one line. Lastly, there is the frames view. For me, this is the view which tells the entire picture.
All of the lines are lofted in this view. The water lines and the buttock lines appear as a grid in this view, however each frame or form is lofted in this view. The frames are slices of the boat at given intervals starting at the transom and working forward to the stem of the boat. If your boat is a double ender then the stern of the boat is a point just as the stem in this view is a point indicating the place where the sheer line meets the profile line. This boat has a transom with a good bit of rise aft.
If you look again at the waterlines in the plans view, you will see that as the water lines get lower on the boat, they turn in on the hull. If you look at the frames drawing on the left, you will see that the lowest water line never reaches the transom. There is one more set of lines that we should discuss. Diagonals are typically only drawn in the frames view and serve the specific purpose of filling in the blanks.
They are not necessary for the lofting of the boat, however, depending on the hull shape, they are necessary for picking off points to create frames. They are also at times lofted in the plans view just as another verification of a fair shape to the hull, however little information other than that can be derived from their lofting in this view. Because of the curves of some hull shapes, the water lines and buttock lines can sometimes leave blind spots on various frame locations.
These lines are defined as starting at an arbitrary point typically above the boat on the centerline and a second point given for each diagonal usually defined as an intersection of a water line and buttock line. They simply need to accomplish the need to fill in points on the frames that are not otherwise defined by the waterlines or diagonals.
Boat building vs. Boat Lofting. That pretty much describes all of the components to a lofted boat. Now I know that you may be thinking, but what about the gunwales, knees, keels, keelson, battens etc, etc, etc I told you in the beginning of this that there is a difference between boat building and lofting.
Lofting is an effort to define a hull. Before you jump all over me for that statement, let me give a couple of examples. If you are lofting a boat stem, are you lofting it for a Laminated split stem which has an inner and outer stem, or are you using a traditional stem with a stem foot and sawn lumber.
Is the stem on piece so that you need to loft the rabbet line? Or is this a stitch and glue boat in which case you don't need to loft the stem piece at all because there isn't one. So understand what I am saying here. I am not saying that a good lofter will not be able to both draw and pick off such items as stem details, , batten locations, transom knees and so forth.
What I am saying is that these things are not necessary for the purposes of defining the hull shape and for picking off the patterns for the molds or frames, which of course is the job of the lofter. Once the hull shape is defined, and presuming that you know how the boat is to be built or at least the methodology which will be used to build the boat, then you can add such detail to the drawings as to convey instructions to the perspective builders.
In the case of a plank on frame boat you will want to add battens, knees, stem configuration, transom framing, skeg, engine bedding, floor supports, bulkheads and on and on. In the case of a stitch and glue boat you will want to give panel expansions, bulkheads and their locations, specific locations of any structural members and seating arrangements which are typically all part of the structural integrity of a stitch and glue hull.
Journals Articles. Lofting Basics Posted in Articles. The Basics of Boat Lofting Introduction First, let me make it perfectly clear that the vast majority of the boats on our site are lofted for you and full size patterns are provided. The History of Lofting you need to know this There are a couple of things to know about lofting before you learn to loft.
Now let's describe the views. Instead, look into building this tiny houseboat. It has a gorgeous interior and would make a great full-time home or a small vacation home. Who says you have to build something overly complicated to enjoy a day out on the river? Instead, build this simple raft. It looks buoyant and can help you to have many enjoyable days out on the water. Would you like a light-weight kayak you can build yourself? Consider creating this kayak made from sea foam.
It only weighs 16 pounds and is built to be eight feet long. This could be a great way to enjoy many days out on the water without much fuss. Now you have 20 different options for a DIY boat. You can choose between kayaks, johnboats, houseboats, tiny homes, pontoons, and much more. This article contains incorrect information.
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Stay tuned for the first newsletter in the morning, straight to your inbox. For now, feel free to continue reading. Here they are: 1. Basic Wooden Boat Whether you need a small fishing boat or a smaller boat to paddle around a pond, these plans are great for either. Recumbent Pontoon Pedal Boat Do you enjoy renting a paddle boat and heading out on the water? Plywood Canoe Canoes are a fun way to go up and down a river or other smaller bodies of water.
The Fishing Punt This is another cost-effective option for a fishing boat. Inflatable Raft Fishing Boat Are you struggling to come up with enough room in your budget to build a new fishing boat? DIY River Raft Who says you have to build something overly complicated to enjoy a day out on the river? Seafoam Kayak Would you like a light-weight kayak you can build yourself?
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