Hi All,
New to the forum. I have been tinkering with a side profile based on the logarithmic spiral, a common shape in nature. I have attached my spreadsheet point calculator if anybody wants to give it a try. There are only 3 parameters to play with, so quite easy to adjust the profile. The start and end points will require adjusting manually to bring them back to y=0.
My particular example is designed to make the most of a particular sheet size and I think is quite an attractive profile.