We've been discussing this one over on news://rec.roller-coaster because some assertions have been made that the brakes are hydraulic, which they are not.
But it is safe to assume that the lift motor is hydraulic, and that might explain the reported behavior of the ride: the hydraulic motor is fired up to bring the train down, but of course when the train is being lowered, the weight of the train is enough to do the work...the control valve on the motor basically serves to regulate the motor speed as the train comes down. If a pipe or hose blows between the motor and the control valve, that would release the back-pressure on the motor and allow it to spin more freely, causing the train to drop down the track and into the station brakes.
Which makes me wonder why there is no fuse on the output side of the motor to prevent this from happening...
--Dave Althoff, Jr.
If i'm thinking right about what you describe (with my limited knowledge of hydraulics), Maybe the motor running backwards OVERPRESSURIZED the line (a motor is just a pump in reverse), and the line acted as a fuse by blowing when it reached it's rated burst pressure.
For example, a hose has a working pressure of 3000 psi, which is the pressure it's designed to operate at day in and day out and a burst pressure that 2-3 times the ops pressure, say 10,000 psi. The burst pressure is the absolute MAXIMUM pressure the line can withstand.
So in a sense, the line acted as a fuse to protect the pump and other components.
Coaster Junkie from NH
I drive in & out of Boston, so I ride coasters to relax!
In any case, I have learned that this can't be what happened on Two-Face. Apparently the lift motors on the Invertigo are in fact electric, not hydraulic. The hydraulics on the ride are the release arms that operate the catch car, and the chain tensioner. No telling what the fluid release was, or even if it was related to the actual ride failure, without more details on the ride system.
--Dave Althoff, Jr.
A day at the park is what you make it!
Rob Ascough said:
The article was very misleading. If I didn't know better, I'd have read the article and assumed the train slammed into another one. Typical people making a big deal out of something very minor and the ignorant media not taking the time to learn a little about what they're reporting.
Especially since anyone who knows anything about TF would know that the coaster, by its design, only HAS one train.
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