How to define basic construction elements in the shell expansion drawing

Before detailing the ship's structure you need to define the fundamentals: the basic construction elements.

This article guides you through the process of defining these elements, which include bulkheads, girders, and more. Adding these primary components forms the foundation for the secondary construction elements, such as stiffeners and brackets. Essentially, defining the basic construction elements establishes the starting point for outlining the entire hull's structure.

Did you know? The complexity of a shell expansion drawing can vary greatly depending on the size and design of the vessel. Simple barges might have a relatively straightforward drawing, while large cruise ships can require incredibly detailed and intricate shell expansion drawings to capture all the nuances of their design.

Defining basic construction elements in the shell expansion using MasterShip

This video shows how to make basic construction elements in the shell expansion drawing in MasterShip from the software perspective. Next to that, we have listed some of the best practices in the shipbuilding industry from the engineering perspective, and how MasterShip functionalities apply below. 

• Define in 3D shape model first: Begin by creating the elements in the 3D model using features like SHIPPOLYPROJECTION or PROJECTGEOMETRY. Then, transfer them to the shell expansion drawing using the SHIPLONGS3D2D command. This ensures consistency between the two and avoids missing elements in the drawing.
• Define in shell expansion drawing first: You can define elements directly in the shell expansion drawing for a simpler initial layout. The SHIPLONGS2D3D command can then be used to transfer them to the 3D model. Utilize AutoCAD commands like OFFSET and TRIM for defining these elements within the drawing.
• Include typical lines for reference: for example waterlines, framelines and other relevant lines. They can be generated in the 3D model using the SHIPDRAWINTERSECTIONS command. This aids in positioning the elements.
• Tip: While there's no direct link between the 3D assembly model and the shell expansion drawing in MasterShip, you can insert the shell expansion drawing into the assembly as an XRef. This creates a visual reference for checking consistency.

Output and Next Steps

Following these practices will result in a shell expansion drawing that clearly represents the basic construction elements of your vessel. With this foundation set, you can proceed to the next steps, such as designing the basic construction in the sectional drawings and defining seams and butts