Started experimenting with the Limber Channels (eel channels).
It's terrifying to cut a gouge in every frame, that took 18 days to fair smooth. I needed a foolproof, repeatable method before cutting the channels.
Many beautiful models omit this detail (possibly, the builders are also terrified of marring a beautifully faired hull)??
Below process is very basic stuff. I want to help anyone by sharing the method this shipyard came up with.
1. Below photo shows how small a 4x4 inch limber channel is. A square jewelers file is shown next to the channel.
View attachment 573600
2. Shipyard laid out a line, then used a sharp chisel to define the centerline of the channel.
View attachment 573603
3. Next a triangle jewelers file increased the depth of this chisel line.
View attachment 573604
4. A few passes with a round jeweler's file increased the width and depth slightly.
View attachment 573602
5. Next a rough #2 cut round rasp quickly cut to the final depth and width.
View attachment 573605
6. A round file smoothed the edges.
View attachment 573606
7. The chisel squared the round edges.
View attachment 573607
8. Finally, a few passes with a square jeweler's file gave a square 4"x4" limber channel.
View attachment 573608
6 minutes/frame x 86 frames = 516 mins (estimate 8.5 hours to do all the frames).
Sorry for the long post. This worked for me and I hope it helps someone else in the future.