Link edited to put flame straight down.
For some reason, flame forge doesnt let me use it after a certain short period of time each day. =/
But if you really want to see this, press CTRL + L ingame, preferrably in single player, and enter the values listed in the link into the flame forger console. Its a lot easier than it sounds.
Just go to the XYZ tab, set z_gravity to about 20, z_velocity to about -70, and the flame will go down quite fast, but once it gets to the bottom, will rise up again.
as you move, it should curve in that direction. but you'll get to see it happen. once youre happy with it, click create. youll be taken to a page on the toribash website, with a new link, copy and paste that link to someone with a flame forger "license", ask for price quote etc.
Anyway, enjoy.
flame i showed you earlier, but should be going straight down. I wouldnt trust/use this personally. only use it for reference.
http://forum.toribash.com/tori_flame..._body_radius=0