Panel Anew

Panel discussion continued

In the last post I described how to develop the flat bottom panel of the sampram and how to develop the bow and stern transoms. In this post we'll discover how to develop the side panels.

The sides of the sampram have pretty constant angle to the bottom which allows us to develop the panel fairly easily.

The first step is to determine the overall length of the panel at at least two elevations or waterlines. The first step is to draw in two waterlines on the profile one as close to the bottom as possible, but still staying within the confines of the panel shape, and the same at the top.

These waterlines are then transferred to the plan drawing using the method described here  and here , with a hitch, since your sections are already developed you draw the waterlines through the sections then transfer those points, the intersections of waterline and station line in the section, to the station line on the plan drawing and then join those points to make a curve.

Once those curves are drawn then we start to construct the side panel in the same way that we did the bottom panel. However with the bottom we knew we had a good starting point since we knew the position of the bow and stern and we could start our drawing from either end. In this case you don't really know where the bow and stern edges will fall so you need to start from station 5 and work in both directions. Why you ask, well with the bottom the section lines in the plan drawing  are vertical and parallel and remain so on the panel. The section lines on the profile a similarly vertical and parallel but on the panel when transferred they are not and you can see this by measuring the distance between the station lines on the section drawing on the waterlines.

The difference may appear miniscule but it makes a huge difference to the shape of the panel.

In any event we start to transfer the distances between the station lines to our panel drawing. To start draw an horizontal lines as the baseline for the panel drawing. Draw a vertical line, which will be station 5, up from the baseline. Transfer the distance from the lower waterline to the intersection of the chine and station 5 from the section drawing,

and draw an horizontal line through the intersection of the new station five and the transferred circle. That horizontal line is our lower waterline.

Now transfer the other distances from the station 5 section in the section drawing to our panel drawing. The circle A is the lower waterline, B is the upper waterline and C is the full length of the station line at section 5. Draw in the upper waterline and we're ready to begin drawing in the gunwale and chine.

Ignore those station lines they were just there to establish a central point for station 5.

Erase all the station lines, except 5, and the circles leaving the tick mark where circle C cuts station 5.

 

Next time, the panel itself!