Dave
TS Founding Member
The Wicker Man chain has been doing that for a long time now, you’ll notice usually only when it’s cold and wet. Never when it’s dry. It’s been reported a few times and I’ve even seen it reported on Twitter and it’s been stated it’s perfectly normal and okay to do that.
I can only guess it’s either the weird angle of the lifthill, or just the design of the ride. The way it bangs though I’m surprised it’s not come out of its runner.
Probably a mix of the unusual angle of the lift hill and the fact they have quite basic chain tensioning. If you look at most steel coasters the chain usually runs through an array of gears near the base of the lift hill to tension the whole chain including on the return.
Wooden coasters seem not to do this (well GCI don’t), unsure why.