CDR_Ret

Regarding mast tapers (and this applies to spars as well), applying the tables found in Underhill's book for the latter 1800s, you can see in this image that the individual masts are not "conical" tapers. They tend to gradually taper starting at the base then more quickly toward the heads. This is because the torque applied to any section of the mast is greater toward the base and least at the head. That torque on a mast also includes the forces applied by the mast(s) above it. So it makes sense that the mast diameter doesn't simply change proportionately with height. An extreme foreshortened view of the 1891 brigantine Galilee's combined fore topgallant-royal mast, showing the mast taper profiles for each section. Terry

That was true as well in our operational spaces on a submarine. Cupholders were provided near any flat surfaces. However, in the Wardroom and Crew's Mess at sea, tables were covered with Naugahyde, which was somewhat padded, so plates and cups didn't slide with rolls, and angles and dangles. Terry

Hey, Julie, I think those are the files for my Background Images tutorial that I created back in 2022 when I was still primarily using DELFTship. The files can be found here in MSW. You are correct that the instructions are a bit dated, but the principles are still pretty much the same. Those instructions were created with reference to DELFTship v. 19.10 (328). The current program version is 17.30 (358). (Don't ask me how the version numbering system works . . .) The instructions are best for providing the steps for approaching a project. The D/S manual is and has been very weak on how to get into constructing a model. It tells you what each feature does, but very little on processes. Terry

Hi, Giorgio. I'm with Julie on this topic. It's likely that someone proficient in Rhino would be able to eventually develop a nice hull, and then add on all the topside embellishments. However, trying to learn how to use a general-purpose 3D-CAD program like Rhino to create a hull comprised of surfaces varying in three dimensions, adhering to an existing set of basic plans, has proven to be challenging to a lot of folks attempting that. DELFTship, on the other hand, is a for-the-purpose naval architectural program with built-in features, like the three standard hull form views (sheer, halfbreadth, and body plans), along with features like "intersection" lines to show stations, waterlines, buttock lines, and diagonals—that all help in hull faring process. This is almost always needed because classic vessels were constructed from hand-drawn plans, and these plans, especially if they were developed before the advent of CAD, tend to lead to lack of fidelity among the standard views. In addition, DELFTship provides surface analysis tools that enhance the faring process, like Gaussian surfaces, that visually reveal bumps in the hull surface as well as providing local curvature analyses. The program is primarily used for hydrostatic and hydrodynamic analyses, but the structural features work well for simply modeling at any scale. One difficulty that most new DELFTship users have is what Julie mentioned—the surface mesh (called the control net) doesn't actually lie on a curved surface because of the mathematical way the program works, which is something you simply have to get used to. I suggest that you take a look at some of the reconstruction projects here in the various forums that utilized DELFTship to see how it presents. Like most 3D modeling programs, it has its own steep learning curve, but once you become familiar with it, the results are directly useful for developing plans of a vessel hull. Terry

Here's my two cents: My Galilee was an 1890s-vintage US-West Coast brigantine. As-built, her standing rigging was steel cable. For the DTM charter (1905--1908), her mast standing rigging was swapped for arctic-service hemp rope to reduce her magnetic signature. Photos of her prior-to and early into her DTM charter period showed rope running rigging throughout except for light chain sheets for the jibs. The foremast yard tye-lifts were of heavier chain, which were retained even during the DTM charter period. Some of the heavier service running rigging for the main boom, like pendants and lifts, may have been wire. Hard to tell from the photos. Hope this helps. Terry

This is a recent BBC article about the Sutton Hoo ship, including a site photo.

Sadly, this just kicks the inevitable can down the road. Digital media also has a half life. The only way to perpetuate information in any medium is to recopy it before the reading-writing technology becomes obsolete. There is the story about a well-known ancient British history book (The Domesday Book) that was digitized in a proprietary format, involving an immense amount of time and resources. However, within just a few years the digital format became obsolete, negating all that work.

Wow, Julie, what an intro! You seem to be what they called a polymath in back in the day. If you need any assistance with getting started in DELFTship, I may be able to assist. It's very good for developing fare hydrostatic hull forms but it bogs down when creating lots of fine details. Terry

You should visit the many threads in this CAD/3D Forum that address your question. For basic hull creation from plans, I believe that DELFTship Free will produce the most faired and smooth results. Then export the resulting model into other recommended programs to create the details.

Those guys all look pretty buff!. Aren't there any striplings in your crew? 🙂

You might try these fixes: https://pdf.minitool.com/news/cant-download-pdf-files.html

And digital is even more forgiving and takes up zero space in the livingroom!😉 Terry

Nice! This configuration shows her several years after I left the boat. Terry

On submarines, we always slid down the main stairs between decks on the handrails with hands only. You controlled your speed with your grip. I even saw our COs do this on occasion! For vertical ladders, there were always hand grips positioned somewhere above the top rung to help the transition between ladder and the deck.