Slipping

Flashback was the first to use heartlining, (other than pipe-line coasters?). Since then ALL Intamin's (and later B&M's when it was formed) use it. I dont think vekoma or arrow ever did. Thats why arrow and vekoma dont't have inline-twists, the G's would be insane without heartlining.
Btw, heartlining was werner stengel's innovation, he designed flashback and "invented" the heartline (genius!)!
Flashback is rough because of it's age, and I heard rumors that Six Flags "butchered" the ride, because the heartlining didn't look right to them, so they made modifications to the track.

knowinf six flags and what they are like...thats all too good of a possibility

Just to clarify: The "slipping" (a term that is not used in coasterdesign AFAIK) is the result of heartlining. No difference really.

Buster.

About Flashback, IMO it isn't rough, just not B&M smooth. It isnt painful by any means, and I think it is one of the best rides around. About SF butchering it, I believe that they modified slightly due merely to aging of the track, not because it didnt look right.

[coolbeans326]

Dude, Ole should post here, too!!! Since Coastersims.com likes to Ban people, just because its fun to make kids cry!!!!

Since Coastersims.com likes to Ban people, just because its fun to make kids cry!!!!

WHAT!!!!! Anyway, CS doesnt have an RCT section and they require u to be 15 to join.