The bobsled was prone to sand. Does that count? ;)
Long live the Big Bad Wolf
Also, I've seen Gemini after valleying a couple times. And a friend was a test rider on it when it rolled back. I think Gemini is probably the ride most prone to do that, cause the turns are relatively high, and the train goes slow on them even when warm.
According to the official Raptor manual:
"if the wind speed is greater than 20 mph, an empty train must not be dispatched from the station. If the wind speed is greater than 30 mph and the wind is blowing directly off the bay, Raptor must be closed immediately but without dispatching an empty train"
Found this next line interesting:
"Management reserves the right to override this call depending on the wind direction, temperature and speed of the trains"
When I worked on Raptor and we had simular wind conditions we wouldn't even dispatch a train until it was full. We even ran 1 train operations to insure a heavier train. I know we "used" guests as weight on more than one occasion just to get a train back to the station, then we would let them off on the runway.
Lifetime Raptor flights: 1163 :)
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Gemini probably does it the most. I saw at least 2 of those the summers I worked there.
MF valleyed once, thus the water dummies used in test runs now.
Blue Streak can valley in strong winds at the turnaround.
Mantis can valley between drop and loop if the conditions are right and the trims are left on (oops).
Magnum didnt' make it around the pretzel turn once.
I've seen wildcat have to be pushed to get it going again.
Mean Streak has valleyed.
Maybe the question is which coasters can't valley?
I think I would get sick of rocking back and forth after about 2 minutes. 10 minutes would probably feel like an eternity. I guess I could handle it on Magnum of MF because the seats are at least comfortable and open, but Raptor or Mantis would suck.
Other than that, witnessed a couple rollbacks, one on Ka, one on TTD...and a couple *near-valley moments* on some kiddie coasters (BB's comes to mind, LOL).
Tower 2 is basically the same except the train would stop between the loop and Tower 2. After the train stopped rolling back and forth, they would winch it up about 10 feet since the Tower 2 catch car is not able to come all the way down.
2012 SFGAm Visits: 26 2012 Season Whizzer Rides: 84 X Flight Rides: 91
The brakes are there purely to dampen the train's pendulum motion, not to prevent valleying in other sections. Even running at full speed, the train barely makes it over the second half of the cobra roll on the return trip, so to suggest that it clears that, doesn't make it high enough on Tower 1 to catch the car, and then makes it back over the first half of the cobra roll is preposterous.
SFGAm Shock Wave said:
There are brakes at the bottom of the boomerang that stop it so it doesnt valley somewhere else.
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