Developable hull

The Loftsman · Nov 17, 2013

Lofting

To unfold a radius you develop it to the mean of the material so if you have a 10mm thick plate with a radius of 2000mm you would use 2005mm to develop the curve correct.
To unfold a shell plate you develop it and take into account the expanded lengths while you do the development.
The Black Art of Lofting.

Cheers

nukisen said: ↑

One thing i suppose you have to take in the calculation. As far as I know Freship makes the unfolding with the length of inside thickness of the plates. So if you have a curvature in a sheet with radius you have to offset the lines a bit. For an example.
You have a curvature with inside radius 2000mm and with a curvature length of 3142mm.
This will be inside the thickness. But when you bend material it will not bend and stretch excactly in this curve. A normal length would be the length about 30% inside the material. Yes this is depending on how stiff material you do use and even the bending method. In this case I would need a sheet with a width about 3147mm if the thickness of the sheet is 10mm. the bending steals 5mm sheetlength in this case. The more narrow the bend is and higher thickness will make this different decrease and vice versa.
I wanted to tell this so you dont cut and recognise you miss 5 or 10 mm when you want to weld it together.

A good suggestion is to have the sheet a bit overlength and then cut it after mounting.
Almost always easier to cut than make insertion in the material afterwards.

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