Modeling a spiral

Hello,
I want to make a long spiral for my project. Similar to a phone cord or DNA. I’m not sure how to make that… any ideas?

A

greybeard has some excellent video tutorials, including one for making a spiral phone cord:

http://www.ibiblio.org/bvidtute/mytut/curly.mpg

You want to make a helix, not a spiral. (A spiral eventually terminates in the middle.)
To make a helix, you could also check out:
http://wiki.blender.org/index.php/Tutorials/Creating_A_Double_Helix_With_Modifiers
or
http://blenderartists.org/forum/archive/index.php/t-72084.html

good luck!

That’s exactly what I needed, thanks guys!