The current 'Go to' methods for forming compound curved shell plating for steel and aluminum fabricated boat hulls are: 'Line Heating' for steel and 'English Wheeling' for aluminum. The down side is that both methods require highly skilled Craftsmen using very specialized techniques and industrial equipment.
These skill an equipment to fabricate True Round Steel and Aluminum are really exclusive to professional steel and aluminum boatbuilders. As a 'One-of' steel and aluminum Designer and Boatbuilder I understand why the forgoing methods are their methods of choice.
However, there are talented 'One of' Builders who would like to build a True Round sailboat hull, but the traditional process of forming the shell plating for a True Round hull is stalled by lack of equipment and the high learning curve of operating that equipment.
However, there is an 'Alternative Way' to form the shell plating for a True Round steel or aluminum hull that does not require the hands-on-skills and or equipment required by 'Line Heating' and 'English Wheeling'.
If you can build a Hard Chine sailboat hull you can built a True Round hull without the use of an 'English Wheel' or 'Line Heating'.
The Alternative:
The True Round steel and aluminum Boat-building method that I am about to introduce was developed entirely by the author, and is the result of his career in Architectural Metal Fabrication, CNC Programming, Sheetmetal pattern Development, and his studies at the 'Westlawn Institute of Marine Technology'.
The Authors True Round Design and Construction method combines the traditional hand layout method known as 'Approximate Development' with Multisurf by Aerohydro's Marine Three-dimensional surface design software, that enables a Builder to construct a True Round steel or aluminum hull as easily a building an Hard Chine hull design.
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The Prototype & Proof of Concept Build

Click on the below link (Hull Components) to see a preview of the Transverse Frames, Longintudinal Frames, and Shell Plate fabrication or (Building the Hull) for an overview of how the Hull is fabricated.
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A simulated race, (via VPP software), between a Double hard chine hull and Her redesigned version to a True round hull form. (Note: This is not just a race between one person's steel Hard Chine Boat with another person's steel True Round boat, since the True Round Hull is a clone of the Double Hard Chine hull.) The result of the race will shine light on the long ask question. Which type of hull is faster, a true round hull or a Double Hard Chined hull? |
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