It is impossible to do without knowing:
a) The angle of the lead-in that you have
b) The angle of the lead-out that you want
Basically, no one (and I mean
no one) is going to be able to build you a perfect camelback without knowing what you have, want, need, wish to have, what your track is doing, etc. Or better yet, you could learn it and build it yourself. But - to help you out some (more than I just did), here is a picture of several examples:
Image Insert: 69.83 KB
Taken from my coaster, "Java".
[sillyme]