There are lines in your rigging pictures, other than the shrouds, which originate on the channel wales and go upward but I don't know what they do or where they terminate. For the fore-mast they are between the 3rd and 4th deadeyes. Also between the 7th and 8th deadeyes. For the main mast they are between the 2nd and 3rd deadeyes. Also between the 7th and 8th. Also between the 8th and ninth. For the mizzen mast they are between the 2nd and 3rd deadeyes.
Another question: Is the main stay thicker than the fore-stay? Is the fore-stay thicker than the mizzen stay?
Thank you for your valuable time; I truly appreciate your help. I'm trying to get plans from Fred or the Museum and awaiting the Vasa II book.
They are called mast tackles. I think they were primarily for moving heavy loads (such as guns in and out of the gundecks or ballast from the hold), but also for setting up deadeyes/shrouds when rigging and helping to keep the mast centered and at the desired rake.
On the real thing and in my model, these would be/were set up first and so this is why I think they were used for setting up the shrouds and deadeyes and controlling the mast while rigging. If you are going to rig them on a model, I might study pictures of the real ship carefully (or my pictures), since they are rigged a little different there than in the Vasa museum plans. I chose to rig them as shown in the museum.
Fred might correct me or elaborate on my answer.
The forestay should be thinner than the mainstay and the mizzen stay should be thinner than the forestay. I was concerned about diameters of lines for awhile when it came to my build, but once Fred started doing more research on the rope remains, it became clear to me that the Vasa museum plans actually do a pretty good job with diameters of line, and so I just followed their diameters. Luckily, I had lines of most every diameter I needed.
Correct me if I'm wrong when I assume the mast tackle lines go upward from the channels and through overhead blocks. On the Mizzen mast where are these blocks anchored? If you have time can you also answer for the mast tackle lines on the main and fore masts? I haven't been able to discern this by pictures.
The leg of the mast tackles are connected to the strop on the upper block and then goes up around the masthead. I think with the mast tackles on the fore and main, where there are more than one tackle per side, the line is secured around the masthead like a shroud. On the mizzen it might have been more like a collar and each side of it formed the leg of the mast tackle.
The lower end of the mast tackles are connected to the channels with a block that has a hook in it's strop. The hook is hooked onto a ring that is held in place by one of the chains, where they skipped adding a shroud in order to have a place to secure the mast tackle.
If you go to the thread I made for my finished Vasa, you can see that the pictures that are second and third from the last do an ok job illustrating this.
The mast tackles are set up a little different from one mast to another on the real thing, but how they are held by the channels when not in use (or maybe when being used to control the mast) is the same on all all three lower masts. I believe that on the mizzen the mast tackle is secured to the middle chain, with two chains that hold the lower deadeyes for shrouds to each side.