I remember hearing that Intamin megas use the advancing wheels to completely stop a train because the magnetic breaks could not fully stop a train. I also remember seeing small fin brakes on Volcano used for the same purpose.
I thought the holding brake on Impulses are magnetic. Do they really hold the train for a split second or do they just delay the drop?
They are (I believe... correct me if I'm wrong) LIM's on the back spike that hold you up, not brakes.
They do, in fact, stop the train completely on the back spike (sometimes, the train will skid a little down the spike). I suppose they could hold a train up there as long as they want... or at least until the LIM's overheat.
The LIM's fire at just a strong enough level to stop the train in place and counteract gravity...without overpowering it and moving the train back up the spike. The whole process lasts for just about a second.
-Proud co-founder of the Coasterbuzz street team
They are not really brakes, they are motors which apply a 1G backward thrust to the train. A motor operating in this fashion is said to be operating "at stall"...that is, power is being applied, but the reaction plate is not moving because an outside force...in this case gravity...is preventing the reaction plate from moving in the direction the motor is going.
The Impulse coaster is really a very good demonstration of all the different things that LIMs can do, as it has acceleration in both directions, fine positioning, and operation at stall, all things that may be more difficult with other drive systems.
--Dave Althoff, Jr.
Hmmm, they could reverse the thrust & slam the train downwards with a similar effect to a Turbo Drop.
I also wonder if they've ever held the train there for say 5 seconds or more in testing. The track should be strong enough for that. Maybe not if the LIMs overheat quickly.
A neat little thing to look for... that 1G thrust Rideman is talking about is actually only programmed to counteract the weight of the train empty. When S:UE tests in the morning, it makes a complete stop aside of the tower, it doesn't slide down at all. But when you put bodies in the seats, that's when the LIMs don't put forth enough energy to keep the train motionless, it then slides down.
I wonder what would happen if the LIMs were up-ed a notch to make a 1.5 upward thrust on the train... it would push the train up when testing empty, but it would completely hold a full train when people got on.
*** This post was edited by Zero-G on 7/11/2002. ***
SFGAm: 1)DV 2)V2 3)AE Blue 4)Viper 5)Bull
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