Ok, this area is like dead, so Im' gonna ask something. Log flumes.... the ones with convaior (sp??0 belt lifts. What keeps em' from flipping back? Ive never seen how they could lock on.
The conveyor is of rubber, so a little friction holds the log on its way up. Along the sides of the flume, there are 'clappers' (I think thats what they're called) that slam up against the log, to keep it from rolling backwards