Do boomerangs/invertigos have anti-rollbacks

Monday, February 11, 2002 3:27 PM
Do boomerangs/invertigos have anti-rollbacks? If they do, how does it come back down from the 2 lift? If it doesn't, does it ever not make it to the top and fall backwards??
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Monday, February 11, 2002 3:37 PM
I belive it has rollbacks just like Millenium Forces, which is why there is no click click sound.
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Does CCI know how to make a bad coaster?
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Monday, February 11, 2002 3:56 PM
hey FOF, just out of couriosity, what park are you working for?

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Monday, February 11, 2002 3:59 PM
No they don't.  They roll back often, but when that happens they stop in the boomerang, or another valley. 

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- Peabody

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Monday, February 11, 2002 4:05 PM
I thought they had the ones like on M-Force. I think I have seen them.

What happens is they can rise up...and drop down so if a train stops they rise up and stop it...and if it is ready to drop is drops down and the train can roll backwards.

That thump you feel on the second lift is the anti-rollbacks and chainlift coming up to catch the train...atleast that's what I always thought it was.

Can anyone verify this?

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Monday, February 11, 2002 4:37 PM
No anti-rollback per se, but they do all have a brake between the vertical loop and lift two. This brake closes when the train is engaged on either of the lifts; opens when the train is successfully raised to the top of either lift; and closes right after the train passes it.

You can hear the pnuematics cycling.
jeremy
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Monday, February 11, 2002 4:44 PM
I could swear Face/Off has a system like Millie
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Does CCI know how to make a bad coaster?
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Tuesday, February 12, 2002 10:47 AM
Now,when I post this, I just want to explain I havent seen the antirollbacks on MF...

On F/O at PKI, there is something that does release when you are at the top of each drop. I dont know if this is part of the grabbing mechanism, but it releases and you go downward. The reason the brakes are at the bottom is for a miscatch, so you dont keep going in between the loop and anywhere else (in case you do have enough speed to go over the loop again). Thats a much easier spot to get people down from.

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http://www.islandguide.8m.com
all about PKI
SOB/TG crew in 2002

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Tuesday, February 12, 2002 12:02 PM
I believe that it doesn't have anti-rollbacks. If it did then there wouldn't be a need for the brakes at the base of the loop/2nd hill. I think the thunk you are referring to is the chain dog grabbing onto the train. And I also think you got the drop down thing confused. The chain drops down and nothing else. I have studied this ride closely and I haven't seen rollbacks at all.
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SFNE loses its "floor" for 2002! Visit www.geocities.com/sfneguy for info. and pics of SFNE, including the most unique constr. pics of SFNE on the web. Formerly known as srosatsfne.
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Tuesday, February 12, 2002 12:35 PM
FOF and Jeremy and SFNE Freak have sussed it.

There are no anti-rollback mechanisms on the Boomerang or Invertigo coasters, but the lift mechanisms of the two coasters are very different. Both use the same "Bad Thing Protection" mechanism.

On the Boomerang, Lift #1 uses a claw mechanism mounted on a catch-car and pulled by a wire rope to haul the train backwards up the lift. As the train leaves the station, the station brakes close...the idea is that if the hoisting cable breaks, the catch-car lets go, or other Bad Things happen, the brakes will slow the train enough that it won't complete the first inversion and will roll back into the station. When the train reaches the top of the lift, the station brakes open. Finally, the catch-car passes a ramp mechanism that opens the claw, releasing the train. The train heads down the drop, through the station, through the three inversions, and up Lift #2. As the train passes the brakes at the base of Lift #2, those brakes close. Again, the brakes are intended to slow the train if there is an early release so that it will valley between the vertical loop and the lift instead of between the two sidewinders 80' in the air. Lift #2 uses a set of conventional chain dogs on the train, and an almost conventional chain lift. As SFNE Freak pointed out, the chain lift is mounted on a pneumatic cylinder so that once the train reaches the top of that lift (and the brakes at the base of Lift #2 open), the entire lift assembly...chain, chain guide, bullwheel, idler wheel, motor, etc....drops back perpendicular to the lift track, releasing the train so that it can roll backward down the hill.

The THUMP! and lurch that B&M-TYCOON is talking about on the second lift happens because when the train reaches the chain lift, the chain lift is either stopped, or has just barely started moving. So the train tends to overrun the lift, then drop backward until the chain dogs engage. You can hear the dogs jump over the first few links of the chain before that happens. Both lifts on the Boomerang use hydraulic motors, so they are stopped when not actually lifting trains.

On the Invertigo, things are somewhat different. The brake timing is the same as on the Boomerang, but the lift mechanism is different...but basically the same on both lifts. A catch-car waits at the base of the lift for the train to arrive, moving up the lift at a speed to match the train. As the train engages, the catch-car closes what is essentially a brake caliper on a fin on top of the train and pulls the train to the top; at the top an external trigger opens the caliper to release the train. By matching the speed of the catchwagon to the speed of the train, the engagement is much smoother than on the Boomerang, where the traditional tooth-shattering chain clutch is used.

Any questions? :)

--Dave Althoff, Jr.

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Tuesday, February 12, 2002 1:02 PM

2Hostyl said:
No anti-rollback per se, but they do all have a brake between the vertical loop and lift two. This brake closes when the train is engaged on either of the lifts; opens when the train is successfully raised to the top of either lift; and closes right after the train passes it.
You can hear the pnuematics cycling.
jeremy
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Wow.  You know, now that you bring that up, I remember seeing that when I was in line for Face/Off.  I remember learning when it would open and close, too, since I was in line for so long.  Neato.

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Tuesday, February 12, 2002 1:30 PM
I was waiting for Rideman to nail this one.  Thanks, man!
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- Peabody
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Tuesday, February 12, 2002 1:41 PM
Also, many of you know SFDL's boomerang was working 'zonky' this past season, when the train catches on to the chain, it rolled back a good 5-10 feet or so before actually going up... scary indeed... and kinda prooves that no such thing actually exist =P
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Tuesday, February 12, 2002 2:08 PM
Dave:

How are the catch wagon and the train synchronized on an Invertigo so that they are going at the same speed?

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Tuesday, February 12, 2002 6:59 PM
Honestly, I don't know exactly. Of course, once the caliper closes and hooks the catchwagon to the train, they'd better be synchronized... :)
I'm not sure whether the train speed is measured, or if they just estimate what the speed should be and snap the caliper closed when the train gets there, or what. Point is, the catchwagon is moving when it catches the train.

--Dave Althoff, Jr.
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Tuesday, February 12, 2002 7:34 PM
On Deja Vu there are breaks underneath the cobra roll and before the second tower thats what I know but as far as having a catching system on a cable lift or any reverse coaster you could not have one due to that it would catch the roll back thing just as FoF said.
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Wednesday, February 13, 2002 7:13 AM
Dave/Jim...the moving catchwagon is a pretty big improvement IMO....just hate how sometimes a train will "catch" the chain and BANG, you're bouncing up a lift...
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Wednesday, February 13, 2002 7:20 AM
Why would they need anti-rollbacks.  There is only one train.  It would be much easir to get the riders out anywhere else than the vertical/inclined surface if the ride would fail.
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Wednesday, February 13, 2002 10:12 AM
Also, I don't know why Flashback does this and Zoomerang doesn't but Zoomerang is lifted up the second hill much faster than Flashback. On Flashback the pause has been getting longer and longer. You head up the 2nd hill here the chain dog (rapid clicking) but then it doesn't start right away. If anybody is into the technical side of rides as much as I am they will have noticed the change in pause from 2000 to 2001. When I locked in you don't go for about 3 secs. and you can hear the motor struggling with the weight of the train. Is this the only boomerang that happens on?

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SFNE loses its "floor" for 2002! Visit www.geocities.com/sfneguy for info. and pics of SFNE, including the most unique constr. pics of SFNE on the web. Formerly known as srosatsfne.

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Wednesday, February 13, 2002 12:04 PM
 Maybe they have a system like on S:UE. Where fiber-optics pass through little "teeth" looking metal slabs on the track and that tell the computer how fast the train is moving thus it knows how much it needs to slow it down or speed it up or in the case of the invertigo's how fast to move the catching mechanism.

I am not sure but I wonder if a sensor on the track could measure how fast the wheel assembly's are going by. I think it could be done...basically the same principal.

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