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Re: Conic Projection

Good stuff here, folks. Sorry that I am late to the party; I should have been more attentive.

As I started my career as a pencil-and-paper draftsman, I did a fair amount of conic projections. Modern computer technology has certainly taken a lot of the drudgery out of designing boats, but it IS nice to know how to do it 'the old way'. Over the years I have collected a number of papers on the topic, which I would be happy to share with interested parties. Send me a PM and we'll work out a method to get a copy to you. In my file #2180 I have the following papers:

**Multiconic Development of Hull Surfaces** - Sam Rabl (The Planimeter, 1958)

**Developable Hull Surfaces** - Ullmann Kilgore (Marine Technology, SNAME)

**A Standard Series of Developable Surfaces** - L.W. Ferris (Marine Technology, SNAME) *(a mathematical method, not graphical - mmd)*

There are a number of other papers, but they are more complicated, more mathematical, and mostly geared towards programming a computer to develop fair planar surfaces.

The Rabl paper is probably the best one for developing a chined hull panel using conic projection. It is clear in both illustrations and prose, and easy to follow along. It is available as a downloadable PDF at https://www.boatdesign.net/attachmen...001-pdf.82878/ Click on this link and it will download the PDF to your computer.

*Hope for the best, but plan for the worst.*