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SardonicMeow

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  1. Mark, I may have achieved what you want in Fusion 360. On the Ernestina plans, there is a line identified as the "measured sheer line". Unlike other plan lines, this line is curved in every view. To start, I used the intersection of three offset planes to locate the point at the bow where the line starts. I then started a fit point spline sketch in a plane parallel to the side view and created the curve shown below. Let's call this curve A. Next, working on a plane parallel to the top view, I created a second curve following the sheer line as viewed from above. Let's call this curve B. From this view, curve A looks like a straight line. Both curves share a starting point at the bow. Here are the same two curves viewed from the side. In this view, curve A is curved and curve B appears straight. Now it's time to combine them into a single curve. I go to Sketch -> Project / Include -> Intersection Curve. First I select a plane for the sketch. As far as I can tell, it doesn't matter which plane I use, but I used the offset plane where curve B lies. Next, the tool pops up asking me to select the curves. I select curves A and B and hit Ok. Here is the new sketch curve, displayed in purple, from the side. And from the top. As you can see, it curves in several directions. Here it is along with sketches for the rabbet line and water lines. Unfortunately, Fusion 360 does not allow me to use it as a profile in a loft. However, I may be able to use it as a rail if I am lofting using the section curves. I plan to try that next.
  2. Here is a picture I took last fall of the Sultana replica showing that feature in more detail. On the replica ship, that is where the life vests are stored. I'll let someone else respond as to whether or not hammocks would have been there on the historical ship.
  3. Mark, thanks for mentioning that video. Here is a link to it if anyone else is interested. It made it clear that I was going in the wrong direction by using Patch to create the hull surface. I should be using Sculpt / T-Spline, which is much more powerful. I am now learning what I can about it. I'm not clear what you're asking regarding projection / intersection. In what I have done so far, all of my curves have been drawn in planes which are parallel to the primary XY, XZ, YZ planes. In your drawing it looks like you have a curve in the XZ plane and a target plane that is at an angle to the XZ plane and you want to project that curve onto the target plane. That's not something that I have done. What I did was create waterline curves in the waterline planes, then I found the points where each station plane intersects each waterline curve. After that, drawing in a station plane, I drew the curve for a station, making sure the curve would pass through the intersection points. I can post a more detailed explanation with pictures if that would be of value.
  4. I went looking through pictures I took of the Cheerful / Surly model in the Rogers Collection at the US Naval Academy museum, hoping to find something helpful. However, on that model there are no lockers or heads or anything in the stern. Oh well.
  5. I have been slowly learning Fusion 360 with a goal of accurately modeling a hull as a 3D object based on lines plans. I haven't been completely successful, which is why I titled this "an attempt". I am posting with the hope that individuals with more Fusion 360 than me can tell me if I'm headed in the right direction with my approach, and if so, how to proceed from here. Thanks in advance for having a look. For this exercise, I have used the plans of the schooner Ernestina, which can be freely downloaded from the Historic American Engineering Record at the following link: http://www.loc.gov/pictures/item/ma1719.sheet.00018a/ I chose to use the Ernestina plans because they are very clean and accurate, requiring little extra work to make them usable. I cropped each of the views and saved each to a separate file. Then each plan was brought into Fusion 360 as a canvas, as shown below. To ensure correct scale, I calculated how large each image should be in the 3D environment, I created rectangles of the correct dimensions, then placed the canvases onto those rectangles. That put the images into the 3D world at the correct size. The canvases were positioned so that the world origin point was at intersection of the baseline, center line, and forward perpendicular. Next I created offset planes for each waterline (4 total) and each station line (15 total). It is a mystery to me why Fusion 360 displays larger and larger planes the further each offset plane is from the origin. I created fit point splines for each waterline, drawing each on the appropriate waterline offset plane. I learned early on that if I want to use the Loft operation with Rails, it is a requirement that every profile being lofted must intersect with every rail. To make sure this would happen, I would select an offset plane and use Sketch -> Project / Include -> Intersect to create a set of points where the offset plane intersects with the waterlines. This was repeated for each station offset plane. The intersection points are visible as the purple circles in the image below. Note that one forward station and the four aft-most stations do not intersect all 4 waterlines. Then I drew a fit point spline for each station, making sure to touch each intersection point along the way. Finally it's time to loft. I switched from Model mode to Patch mode, then went to Create -> Loft. The image below shows the result of lofting all 15 sections without using rails, then creating a mirrored body for the other side of the hull. For this particular hull, the shape is pretty good, but I know that for other hulls the incorporation of the waterlines and/or buttock lines and/or diagonal lines is required to achieve an accurate hull shape. So in order to incorporate the waterlines, I need to loft with rails. I can only use the stations which completely intersect with every waterline, so some must be skipped. The result of lofting with rails is below. And that's as far as I can get. My questions: Am I following a good approach, or are there features of Fusion 360 that I have overlooked that would make this easier? How do incorporate the station lines that couldn't be used in the loft + rails? How do I close up the shape at the bow? How do I force curved edges of a body like the one below into straight lines that can bend at sharp angles? Thanks again for any insight.
  6. On Friday I visited Chestertown, Maryland for Downrigging weekend. While I was only able to visit for the one day (it's still ongoing as I type), I was able to see and photograph the ships on display. These included the 17th century ship Kalmar Nyckel, schooners Sultana, Lynx, and Virginia, skipjacks Elsworth and Sigsbee, pungy Lady Maryland, as well as number of small wooden watercraft. I have included in this post a handful of the better pictures. And if you follow the link below, you can view all the pictures I took (unabridged -- both good and bad). I tried to capture as many details of the ships as I could, and I hope that anyone planning to model these or similar ships might find something helpful in there. Enjoy. Link to full set of photos here.
  7. Nice work. How do you plan to handle the centerboard? It looks like it slides down to one side of the keel. Will you plank the hull first, then cut a hole for the centerboard? Or do you create the hole now and add the frames around it?
  8. Earlier in the year, when I visited the Chesapeake Bay Maritime Museum, I purchased a copy of Chesapeake Bay Schooners by Quentin Snediker and Ann Jensen. It contains lots of historical information about these schooners, many pictures, and a handful of plans. It may be useful for this project of yours. I think "longhead" refers to how, at the bow of Chesapeake schooners, pungies, bugeyes, and skipjacks, the stem extends forward and narrows to a sharp point, with traditional painted trailboards integrated on either side.
  9. SardonicMeow

    Fokker Dr 1 by Mike Dowling

    I remember recently seeing a remarkable stop motion video of the building of this kit. Happily, I was able to find it again: Stop motion build of AL Fokker Dr. I by Tom Grigat Maybe it will even help with some of your assembly questions.
  10. SardonicMeow

    Fusion 360

    Isn't it just a free trial? Or is there a free for personal use option that I missed?
  11. SardonicMeow

    Fusion 360

    I have recently been trying some 3D modelling using Blender. I have had some decent success, but wonder how much better other tools might be. For hull modelling, the main challenge is fitting a surface to the various curves that the plans describe. Can Fusion 360 (or any other software, for that matter) do this, taking into account curves in multiple directions? In Blender, it's possible to create a surface from multiple curves, as long as every curve has the same number of control points. However, the connections between the curves are more or less straight. There is no way to use another set of curves, orthogonal to the first set, to "guide" the shape of the surface between. I don't know if that's just a limitation of Blender, or something no software can do.
  12. Here is an explanation of how I have mixed text and images in posts. I hope it's useful to you. First, I decide what pictures I want to include. Then, in a text editor (e.g. Notepad) I write the text of my post and make a note of where each picture will fit. I save the text file so I will be able to reproduce the post if needed. The contents of my text editor would look something like this: When I am ready to post my update, I go to my build log topic on the MSW site, scroll down to the bottom, and click on "Reply to this topic", then click "choose files" and select and upload all the pictures. There will be a thumbnail of each picture at the bottom. Next, I use cut & paste to paste the first section of text into the reply (only the text to be above the first picture). Then I click on the thumbnail of the first image. That inserts the picture at the current location. I am careful to always hit enter after inserting a picture, because otherwise the next text you enter will not start after the image. (Until you hit enter, the cursor will be at the right edge of the image and may be hard to see.) Then cut and paste the next section of text. When entering new text, make sure the cursor is at the far left or the text will not display below the image. Sometimes, when you click below the image, the cursor will be in the wrong place and you'll need to move it down. See below. After pasting in the next section of text, click on the next image to insert and hit enter. Repeat until the entire post is complete.
  13. I don't think it's too much of a problem. Use a small keyhole sawblade and remove the material marked in red in my picture. Then glue and clamp the end of the bulwark to the transom. Will that fix it?

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