Expanding side planking of a skiff

[jwel14]

This might be a too simple question. Have Chapelle's "Boatbuilding book. On page 269-271, he mentions a method on expanding the side plank of a Dory. (To get the true shape). Wanting to try it on a skiff. I can understand the method at the stations. By drawing a diagonal at the stations. Then getting the distance from it for the chine and shear, by using the plan view. I'm having trouble on the ends. Also, am I correct in getting the distance between the stations by placing a batten along the shear line in the half breath view? Thanks.

[Peerie Maa]

This might be a too simple question. Have Chapelle's "Boatbuilding book. On page 269-271, he mentions a method on expanding the side plank of a Dory. (To get the true shape). Wanting to try it on a skiff. I can understand the method at the stations. By drawing a diagonal at the stations. Then getting the distance from it for the chine and shear, by using the bodyplan view.
OK so far


I'm having trouble on the ends. Also, am I correct in getting the distance between the stations by placing a batten along the shear line in the half breath view? Thanks.
No, you do not use the shear line, as it might not be straight when expanded.
You draw your diagonal using the profile base line, establishing its shape as normal. Then you lay your batten around the diagonal and mark the batten with stem, each station and stern/transom.
This batten, when straightened out becomes the datum line for your expansion. Erect perpendiculars at the expanded station positions, then set out the width of the side by measuring up and down the station and transferring this to the expanded stations.
By repeating the process of drawing and expanding a diagonal a known distance away from the first one, the two expanded lengths will define the rake of the stem and stern. If you have a curved stem, you will need to repeat this process with four diagonals to plot enough points for the stems curve.

[jwel14]

Thanks.