Flatten a curved surface

[martin.sona]

Hello, 

I want to build a small looping to drive an rc car through. As I want to build it from sheet metal I need a good idea what form to cut from the material. I thought it would be easy to do in Fusion 360 and I got very close to what I want really fast but now I'm stuck. I don't even need a full model, or even a sheet metal model, it would be totally sufficient if I just get the shape of the part I need to cut out. 

I created this spiral that has all the right dimensions so that the outside face conforms to what I need. But I can't manage to find out how to lay it flat so that I can make a pattern. 

I've recorded a screencast of what I did and hope someone can help.

Thanks a lot!

Martin

[wmhazzard]

If all you need is the length just use the measure function on the outside curve or just use diameter times PI. The flattened form is just a rectangle. 

[TheCADWhisperer]

Examine the attached part.

It has all the functionality that you need to adapt to your part.

[davebYYPCU]

You think so?,   Rectangles from cylinders, parallelograms from coils, but an easy development for cutting.

[wmhazzard]

Yeah, I know, but I didn't think it was important enough to correct.