Vekoma Anti-Roll Back Device?

Tuesday, April 10, 2001 1:50 AM
I have noticed that on SLCs, you can't hear the anti- roll backs. I assume the same thing occurs on Stealth. Does this mean Vekoma doesn't have anti-roll backs on their coasters? That can't be true cause whenever a train gets stuck, it doesn't start down the lift. I geuss they use a different type of system? Anyone know more??
Tuesday, April 10, 2001 3:35 AM
They have a electromagnetic anti-roll back device. A wheel connected to the car runs on what I think is a long metal fin, like braking fins. When this wheel is turning, it produces electricity which keeps the brakes on the cars from engaging. If the car stops or rolls back, no electricity is produced and the brakes engage. Kinda like the emergency brakes found on elevators.

Australia's No.1 Coaster Nut
Tuesday, April 10, 2001 5:08 AM
That's true for Stealth, and I think Intamin's anti-rollback system on Millennium Force is similar. But on the SLC it's a little different. On that one, there is a vertical fin running up the lift hill alongside the chain guide. On top of each car is a pair of spring-loaded cams with teeth on one side. As the train goes up the lift, these cams catch on the fin, which pushes them open so long as the train is moving forward. If the train should move backward, the teeth on the cams will catch on the fin; in fact, the more the car tries to pull backwards, the harder the teeth will grip.

Arrow used a similar arrangement on Big Bad Wolf at Busch Gardens Williamsburg, only they put the cams on the track and used the brake fin.

--Dave Althoff, Jr.
Tuesday, April 10, 2001 11:00 AM
Vekoma's anti roll-back system is relative simple.The trains have theeth on the undercariage.The teeht get into the chain and so they cant roll back.Only if the chain breaks.

T. C.
Tuesday, April 10, 2001 11:43 AM
T.C., it sounds like you're talking about the chain clutches, which are pretty much standard from manufacturer to manufacturer. We're talking about the anti-rollback safety...a sawtooth on a traditional lift hill, the fin-and-cam arrangement on the SLC, one-way clutches on the 700J, or that strange electrical thing on Stealth.

--Dave Althoff, Jr.
Tuesday, April 10, 2001 11:58 AM
When ever i see Top Gun at PCW Broken down the train will just stop at the to same with stealth and boomerangs.

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