You have me wondering what the slight differences in the fitting of the strakes is caused by.
Jan, I was wondering the same thing, so I've spent the time since your posting trying to figure out what's going on.
Clearly, as seen below, if I try to attach a raw, unsanded strake to fit the curve of the stem, it won't reach the previous one to overlap it. This is the problem I have faced since the first strake,
Once I fit the end of it so that the strakes meet, however, then the new one is angled so far towards the keel, that significant pressure must be exerted to conform it to shape.
Where you see the strake overlap in the first 3 or 4 cm, it is just
barely overlapping. In my attempt to fit this one last night, I partially broke it at the glue joint you see at the first frame. I glued it back together and called it quits for the evening.
I thought about wetting or steaming them to try to edge-bend them. That would work if the grain followed the curve of the bend, but it doesn't. Remember, these pieces were cut from a straight-grained sheet of wood. If I moistened the wood, it would only weaken it and applying lateral pressure would surely make it split along the short grain.
Keep in mind that I have only been trimming the barest minimum necessary at the tip of the strake to get it to fit. I then wondered if maybe I was being too conservative and would have an excess of material once I reached the last strake. I decided to dry-clamp the strakes up to #10 to see.
Well, I guess that theory has been shattered. Despite my minimalist approach to fitting, it appears that there will not be enough material to reach the tip of the stem,
even if I trim no more!
I decided to go back to Pavel's videos and try to see what he did. Video #9. Planking Part 2 ends with only strake #4 attached.
I am working on strake #7. His next video, #10 is titled, "Painting Timbers" and he decided to attach strakes 5 through 9 off-camera. Well, a lot of help
that was.
Looking carefully, you'll see that even his strake #9 falls short of the corner of the stem guide piece (the one that is just temporarily glued on.)
My only option at this point is to continue on as I have, carefully fitting with sandpaper and gentile pressure. If (when) I end up short at the stems, I will just have to deal with it as best as I can. Perhaps I messed up early on, but I've really tried to be careful and remove the least amount of material as possible.
I should also point out here that Pavel stops at strake 9 to paint the frames with his patina and tint. This makes sense to make it easier to sand around the sides of the frame afterwards. His next video, #11, dives right into the decking - still only having 9 strakes installed. If you were building from his assembly manual, you would have planked all the way out to #12, the sheer strake and modified your jig into a cradle before starting the decking.
While we have this page of the manual in front of us, there is an important detail that i must point out. The drawing has the bow oriented towards the upper left and the stern at the lower right. You can tell this by the position of the mast step, which is located on the aft side of the central
biti. The location where he drew the detail for the steering oar reinforcement would lead you to believe that it should be placed at that end of the ship. IT IS NOT! The steering oar goes at the lower right end on the side away from you.
As a side note and while the vast majority of those on this forum already know this, here's a bit of nautical trivia for newcomers to ships and ship modeling. Before there were rudders on ships, as in the case of the Oseberg, a separate large oar was used to steer the boat. Most sailors were right handed, so the steering oar was placed over or through the right side of the stern . Sailors began calling the right side the steering side, which soon became "starboard" by combining two Old English words: stéor (meaning "steer") and bord (meaning "the side of a boat"). As the size of boats grew, so did the steering oar, making it much easier to tie a boat up to a dock on the side opposite the oar. This side became known as larboard, or "the loading side." Over time, larboard—too easily confused with starboard—was replaced with port. After all, this was the side that faced the port, allowing supplies to be ported aboard by porters. (Source
National Ocean Service - NOAA)