The Hollowing of the hull has been completed. As I mentioned previously, the best way to hollow parts out is to use the shell command, which automatically creates a hollowed out shell with walls of a specified thickness. I didn’t do this initially because I was making it to scale and the thickness of the walls would vary depending on what scale I wanted to make it. My plan was to get it as far along as possible so that only minor modifications would be required to print different scales. Well, I think once a part is modified, the shell command ceases to work, because it won’t work on any of my sections. So, I essentially remade another hull, smaller and less detailed, and subtracted it from the existing parts, piece by piece. It was a fairly time consuming process.
I started with the bow. I first copied the sections and the reference datum to the side. In the images below, the inner hull to be subtracted from the existing hull is colored red. In the hull section the hollowing began aft of the torpedo tubes. All of the walls will be slightly under 3/32” thick at 1/144 scale as I made the inner hull so that the walls would be approximately 1’ thick.
The image below shows the inner hull to be subtracted from the main hull for Part 1.
In the next image I have copied the shape to the existing hull. Note that it protrudes from the hull. For each part, I copied the end sections outward and included it in the loft to make sure that the lofted shape sliced all the way through the hull.
Subtracting the objects produced the hollowed out shell for Part 1.
Unfortunately, slicing the piece eliminated support for the anchor and created a hole behind the aft anchor arm. To remedy this I drew a couple of polylines on the part end sections…
…And copied them to the main hull.
To finish the part, I copied the anchor to the side and subtracted the one left in place from the hull to create the anchor arm hole.
Actually I only thought I was finished with the part. If you notice in the image above, the lower forward torpedo tube brackets are protruding from the hull. It took me a while to fix that, but once I figured out the best way to do it, it was fairly easy. I didn’t document that process.
The next image shows how I created the sections. The blue polyline is the hull section. The red lines are 1’ long. I drew a polyline between them on one side, mirrored it and joined them. The green “line” on the left is the section at the end frame of Part 2. Although I did Part 1 on a copied version of the hull, for the remaining parts I did all of the modifcations directly on the part...
In the image below, the section has been rotated 90 degrees, the aft end section of Part 1 has been copied, and the sections have been lofted.
The next couple of images show the inner hull with the model layer turned on, before and after subtracting.
As with Part 1, the hollowing left a part suspended in mid-air. In this case, it was the support arms for the bow planes.
In a manner similar to before I made a “patch” for one side…
…And mirrored it to the other.
I then had some objects to subtract, including the plane control arms…
…And various other hull openings.
The image below shows the port side.
The next two images show Part 3. No additional modifications were required.
Part 4 was next.
The bridge slot protruded slightly through the shell so to make sure that there is a proper fit; I beefed up the bottom of the foredeck(?)…
…Copied the bridge onto the part…
…And subtracted it from the hull. In the image below, you can see where it cut into the patch.
Parts 5 and 6 were straight forward and required no additional modifications.
As I was hollowing out the various parts, I was also copying them to the complete model drawing. The image below shows the hull from the end of Part 6 looking forward.
Parts 7 and 8 were also straightforward although Part 8 required a middle section in addition to the end sections.
Part 9 required several sections as shown in the images below.
One last look down the hull. This one from the aft end of Part 9.
The hollowing on Part 10 stopped just forward of the torpedo tubes.