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Cathead
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Everything posted by Cathead
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Your idea is great, but is there any reason they need to be circles? Squares would be much easier to make and seem like they'd grip just as well since the essential point is the surface, not the shape of the edge. -
For what it's worth, "chimney" is the correct term for what would otherwise be called "smokestacks" on a riverboat. Just one of those language quirks; that's what they called them.
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This is just a guess, and hard to describe in writing, but I think the thread on the back side is being tucked under itself before heading off to the next loop around the spar/sail, and that's what's letting it get drawn up along the spar and out of the way rather than creating the diagonal that you have. Looking closely at the instruction photo you posted, I can see that each section of thread running along the spar does a little jog under each loop that looks like it's tucked under and drawn tight. So consider the following actions. Starting at the end of the spar, from left to right, for each loop: - Thread gets run to the next loop - Thread goes over the spar, down through the hole in the sail, out the other side, and back up to the spar. - Now, thread gets tucked under itself, from left to right, then run toward the next loop. This ought to pull the previous one tight against the spar and draw the overlap up to the spar instead of across the sail. I tried this in my mind and it worked. Don't know if that's clear, or even right (could be mistaken). If you want, I can make a quick test case with a few photos to show what I mean.
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- Model Shipways
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Nice job so far! Very cool that you're using local wood, A. angustifolia looks similar to the related Araucaria species I've seen in Chile. In tree form, anyway.
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Garboard strake is shaped and attached. This went smoothly following the directions. Basically, I marked off a scale 12" up from the rabbet on the frames in the center of the vessel, a scale 14:" at the stem and stern, then used a thin batten to project the line the rest of the way. Then I cut out a paper template and used that to cut the planks from my strip of milled cherry. Planks cut prior to bending: Each plank was then soaked and clamped on to take the necessary bend. I used a hot planking iron to fix the bend in place, moving my clamps one at a time to get full coverage: And here is the garboard strake glued on: The closeup photos show that I've been having some trouble with the softer keel woods, both the plywood stem and sternpost from the kit and the basswood I used to replace the lower keel. They're damaging easily. I intended to sand the damage done once the planking is done and see what it looks like then. Camera closeups are also great at accentuating such things when they'll be hardly noticeable on the finished product. This honestly went more smoothly than I expected and makes me look forward to continuing on. Can't wait to see this really start to take shape.
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What a neat and worthwhile prototype! I look forward to seeing this project come together.
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So far I've found it very helpful to be able to remove the framing, it let me reach a variety of different angles while fairing that I otherwise could not have achieved. I was also able to better stabilize individual frames while working, by reaching in from behind, which I found important because the framework overall isn't very well supported from the back and can twist easily under pressure (unlike a frame with solid bulkheads connected to a longitudinal sheet). I suppose one could achieve this by gluing some additional supports between the back of the frames and the build board. I can see the value of either approach but I haven't regretted mine yet.
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I can definitely appreciate the fenders. As a young'un in Western NY, I enjoyed watching lake ships pass through the canals and locks bypassing Niagara Falls. Seemed like there was only a few inches clearance on either side, and in those pre-9/11 days, you could walk right up to the canal-side and touch the ship as it went by.
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I was thinking of the vessel captained by the famous Arturo Prat at the 1879 Battle of Iquique, seen here in 1:20 glory at the Museo Marítimo Nacional in Valparaíso (me for scale). Or perhaps one of various vessels from the War of Independence. As you say, the modern Esmerelda has a somewhat controversial history. But I should not derail your thread any longer. I look forward to learning more about her Mexican equivalent!
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Fairing is complete. It was pretty straightforward; a lot of material to be removed and some shimming to be done, but I feel reasonably comfortable with the result. I ran thin battens all over it to check. I can always do small-scale revisions as planking progresses, adding a tiny shim or carving a bit away if needed. One nice thing about a half-hull is you don't have to worry about symmetry between both sides! Bow views: Stern views: Overall views: So far this is all pretty dull. I'm looking forward to starting the actual planking, when I find out if I'm crazy for trying to use my own wood...
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Cool prototype, this looks to be a very interesting project. A Chilean naval vessel is on my maybe-someday list, so following this can be a stand-in for now.
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I think they're quite good in context.
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The framing is installed and braced. I didn't take in-progress photos as this is well-documented elsewhere and I didn't think I had anything to add. Stern: Bow: These frames are going to need a LOT of fairing. They seem really uneven, and I don't think it's my installation as they're all nice and square and the tops line up fairly well with the rail on the plan (when checked using a square). They're just really inconsistent. For example, look at the gap between these: These: Or these: I'm trying to decide whether to sand down the high frames or build up the low frames. I'm leaning toward sanding down as the frames are plenty thick, and this is overall easier than applying lots of filler strips, which would still then need to be sanded down. Neither the official build log nor the instructions make any mention of this sort of thing, just vaguely mention fairing. So I can't be sure whether it's a manufacturing/design flaw or somehow a mistake I made, but I did find mention of it in some other build logs I read, and it's a bit disappointing as some inconsistency is to be expected but this seems extreme. Oh well. Probably going to break out the Dremel for this, though I normally prefer not using power tools.
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NRG VIRTUAL WORKSHOP - AUGUST 21
Cathead replied to kurtvd19's topic in NAUTICAL RESEARCH GUILD - News & Information
I'm in. Sounds fun. -
I strongly suggest this resource as well: https://www.uwlax.edu/murphylibrary/collections/special-collections/steamboat-photographs/
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I'm working on this project now, and catching up on various other logs. Did you keep working on this? The snapped-off frames would certainly be frustrating, and I'm thinking ahead to how to stabilize this sufficiently when I get there. It also looks like your frame surfaces came out pretty uneven, given the major shimming you're doing? That's how mine is as well. Anyway, hope you haven't stopped working on this.
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Great work! I love it when a model becomes one's own through tweaking. As to the chimney band question, chimneys were built from metal sheets coiled into hoops, which could only be made so wide, so the regular bands likely reflect the joints between those. On the photo of America that you shared above, you can clearly see the regular spacing all the way up. I'm not sure about the exact function of the thicker bands, your suggestions all seem plausible.
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Welcome back, congratulations on your degree, and I look forward to enjoying your return to the hobby. The black makes a nice contrast with the deck.
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Personally, one reasonably accurate set seems sufficient to me, since pure accuracy isn't attainable in this kit and one was very common. You'll improve the looks a lot just by getting the one set right.
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Yeah, you can't go too wrong basing your upgrade on that image. Looking closely, I think she may even have two sets of parallel longitudinal chains, one above the other. And I agree, she does have a couple lateral chains, especially visible around the boiler area. The lateral chains aren't necessarily due to a lack of structure between the decks; that was true of many smaller sternwheelers. They're just part of the inherent need to stabilize a lightly built flexible design without a lot of heavy timber bracing. In particular, this vessel (like many) has "guards", the extension of the main deck out beyond the hull. They're relatively narrow here, but they're there. Those areas were commonly used for cargo storage, you can see piles of lumber for example, so there was a lot of weight on an extended deck with almost no structural support. So the lateral chains are part of the solution to placing all that weight out there beyond the hull. In contrast, the AL design has almost no guard width, which is why I suggested it may not have needed lateral chains (though adding a few would still give visual interest and wouldn't be "wrong"). If there's one truth in steamboat design, it's that things were done lots of different ways and there was no one specific design. These didn't come out of Royal Navy dockyards with standardized plans. So you can't go too wrong picking an image/prototype that you like and using that as a base for whatever improvements you want to make.
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Bob, if you want to learn more about hog chains, you might consider watching a short segment of a talk I gave on steamboat design earlier this year (shameless self-promotion alert!). The whole thing may be of interest, but at 25:05 I specifically discuss hog chains with a few diagrams and photos (https://www.youtube.com/watch?v=Rj7yzkd9geg). Google will also turn up some useful basic information. Hog chains were solid iron rods, not wires, ropes, or chains. And they should run in a straight line parallel to the longitudinal axis (or at 90º to it in some vessels that needed lateral support, which wouldn't really be true for yours), not bend inward anywhere. Though, as you say, absolute historical fidelity isn't really a concern here so it may or may not be worth correcting that. Also, they weren't anchored above the deck (as to an eyebolt) but down into the hull or at least through a deck beam. So, for example, here is a longitudinal chain on the Arabia (note the turnbuckles): And here are a couple lateral chains: If you're interested in making the hog chain assemblies a bit more accurate without too much fuss, I'd suggest two changes: (1) shorten the posts so the chain runs roughly parallel to and just above the surface of the upper deck and (b) run them all the way down to the main deck (if you can) and just insert them into a hole in the deck rather than to any eyebolts. For example, here are longitudinal chains on the Bertrand: There was more than one arrangement possible, but they really shouldn't go as high as the kit has them.
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Just read through your build, I love the extra details that help bring a kit alive and give it a personal touch. A very attractive model thus far.
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