TTD rollback question

As far as LIM's it would just be a big magnet that would just barely pull the car over. It wouldnt be a launch or anything just something to be sure it gets over the top. Just to kinda barely push/pull it over. If need be.

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My life is spent in 5 foot ques made of metal posts standing for hours on end just to sit down and get up to do it all over again 3 minutes later.

And what in your engineering opinion would said LIM's push off of.

It's about the gravity, folks. If that's not acceptable you might as well put a motor on the train and move it all over the place.

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Jeff - Webmaster/Admin - CoasterBuzz.com - My Blog
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What time does the water show start?

Arent LIM's just magnets?
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My life is spent in 5 foot ques made of metal posts standing for hours on end just to sit down and get up to do it all over again 3 minutes later.

No. LIM=Linear Induction Motors.

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-Sean Newman
*** This post was edited by SFgadvMAN 9/28/2003 5:41:24 PM ***

eh my bad I get that stuff confused I mean just magnets like what superman has (the one that just goes verticle then back down cant remember the exact name atm) Just a magnet to pull/push the train over though which could be flicked on by a computer if the train was going really slow.
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Proud member of:
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My life is spent in 5 foot ques made of metal posts standing for hours on end just to sit down and get up to do it all over again 3 minutes later.

LIM= Linear Induction Motor- a type of motor that moves things in a linear fashion (a line) using Inductors. Found on FoF, the Intamin Impulses, California Screamin, etc.

LSM= Linear Synchronous Motor- a type of motor that relies on electromagnets fired in a synchronous manner (one after another) to move things, usually in a linear fashion. Found on Rock 'n' Roller Coaster, Superman: The Escape.

LIMs do NOT use magnets. They use inductors, which are, in their most basic form, a coil of wire that a current is passed through.

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- John
Homepark: CP Home-away-from-homepark: PKI
My Campusfish Blog

Sure. Technically you could just use magnets but if you're going to have a magnet that's strong enough to give the train a boost, you probably can't let people wearing jewelry or watches or glasses or who have car keys or change in their pockets or iron in their blood onto the ride.

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Be polite and ignore the idiots. - rollergator
"It's not a Toomer" - Arnold Schwartzenkoph
"Those who know don't talk and those who talk don't know." -Jeff

I dont think the magenet would be that strong it would be less powerful then the ones on superman the escape. Id say ttd is doing fine recently not sure what the rollback percent is. Id just speed up hte launch alittle more instead of doing all this im just thinking of a diffrent way's to do it. I think it wouldve been sweet if they had a verticle launched lim/lsm coaster.

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My life is spent in between metal railing, where I stand for hours just to sit down for 3 minutes then to get up and do it allover again.

Okay, you're definitely getting your terms/ideas confused. S:TE's launch is accomplished by LSM's. These aren't just magnets (you can't turn a magnet off to prevent it from pulling the train backwards). They're electromagnets timed to pull the train forward and turn off once the train is past. This technology, afaict, is worse in pretty much every way to LIM technology. Neither is a reasonable way to get a Dragster train up the tower.

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Be polite and ignore the idiots. - rollergator
"It's not a Toomer" - Arnold Schwartzenkoph
"Those who know don't talk and those who talk don't know." -Jeff

The Bowling Ball and Feather Hit the Ground At the Same Time...

TTD is certainly an awesome ride. It is also an incredibly complex ride - especially on the mechanical side. TTD is powered by LIM's. For TTD, LIM's are the easiest way to propel the train. Unfortunately, nothing is perfect, and the rollbacks have proven this all too well.

When the trains are ready for launch, they are weighed by a computer which then calculates the power to apply to the LIM's for launching the trains. It is obivous that the computer hasn't been doing a good job of that because then we wouldn't be talking about these rollbacks.

More than likely, there could be faulty hardware that is giving the computer a false reading, and that results in the computer not applying enough power to the LIM's. Most likely the cause could be faulty weighing hardware. (The scale may not be functioning properly or some sensor could be giving a bad reading or be out of alignment).

In the end, the CP mechanics will have TTD functioning properly once they uncover what ever is causing the problems. Until then, we'll just have to deal with the rollbacks.

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What goes up.... Must come down...

I can't tell whether to hit you or cry. Where's the capt. when you need him?

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Be polite and ignore the idiots. - rollergator
"It's not a Toomer" - Arnold Schwartzenkoph
"Those who know don't talk and those who talk don't know." -Jeff

Wow. That's possibly the most complete delusion I've ever seen on Coasterbuzz. Good job.

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--Maddie--
What do I Listen-To?
Hot stuff.

i havent posted in a few months... anything i had to say was already said... but this... this caught my attention... even if it had been said 100 times already i'd still say it.

TTD is not LIM-powered.

amazing. absolutely astonishing. something equivalent to saying that my car's engine is solar powered..... yet for some reason i mysteriously feed it gas each week

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"It's like something out of that twilighty show about that zone"

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krazy pete said:
The Bowling Ball and Feather Hit the Ground At the Same Time...

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What the hell? What does that have to do with anything?

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TTD is powered by LIM's. For TTD, LIM's are the easiest way to propel the train.

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Um... say it with me "hydraulics"

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When the trains are ready for launch, they are weighed by a computer which then calculates the power to apply to the LIM's for launching the trains.

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No, it's not.

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It is obivous that the computer hasn't been doing a good job of that because then we wouldn't be talking about these rollbacks.

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There are many more factors involved than the computer may not have been programmed to account for.

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More than likely, there could be faulty hardware that is giving the computer a false reading, and that results in the computer not applying enough power to the LIM's.

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Again, what LIMs?

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Most likely the cause could be faulty weighing hardware. (The scale may not be functioning properly or some sensor could be giving a bad reading or be out of alignment).

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There is no scale.

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In the end, the CP mechanics will have TTD functioning properly once they uncover what ever is causing the problems.

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There's nothing broken.

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Until then, we'll just have to deal with the rollbacks.

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The only thing you said that made any sense at all.

Congratulations, you have been ripped a new one.

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- John
Homepark: CP Home-away-from-homepark: PKI
My Campusfish Blog

edit: quote problems
*** This post was edited by Michael Darling 9/29/2003 8:06:45 AM ***

Yes, you could add an LIM near the top to reduce roll backs. It could probably use the reaction fin already there for the magnetic brakes.

No, it would not be simple. It would be far simpler to launch the train with a little extra speed and use adjustable magnetic brakes near the top to slow it to the proper speed. That's provided that you can get the train going fast enough.

The total weight to be accelerated on TTD is far more than just the train. The catch car, cables, drum, motors, and even the hydraulic fluid itself have to be accelerated with each launch. This adds a lot of mass.

Running a half full train might help slightly. If the thrust is the same a lighter train will have a little more speed. I don't see where putting the people in the front would help any amount though. It may just be a loading convenience. They can leave the rows that they aren't using secured all the time.

Does anyone know if revoving the wheels from the catch car increased the coefficent of friction? I know that the issue with TTD is not just control. They are border line on thrust. They have already added larger nitrogen resevoirs to help. Anything that might increase drag such as wind, cold, or other increased friction is going to hurt.

There are no fins on the trains, they're on the tracks. The trains just have plain vanilla magnets on them, the reverse of Millennium Force.

I bet they have a nice set of those tools you use around magnetic stuff. :)

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Jeff - Webmaster/Admin - CoasterBuzz.com - My Blog
Blogs, photo albums - CampusFish
What time does the water show start?

Major brain fade on my part. They would have to add some sort of adjustable fin a the top of the hill which would probably be new technology making it more difficult.

Only vanilla magnets, Jeff? It'd be so much cooler if it had strawberry or Superman flavors.

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- John
Homepark: CP Home-away-from-homepark: PKI
My Campusfish Blog

Jim Fisher said:
Major brain fade on my part. They would have to add some sort of adjustable fin a the top of the hill which would probably be new technology making it more difficult.

that just adds the cost and makes the ride dumb cuz it crawls over the top, roll backs are fine no big deal.

Um...if you had read the rest of the thread, you'd realize Jim wasn't actually considering doing this, but responding to someone else's idea.

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Be polite and ignore the idiots. - rollergator
"It's not a Toomer" - Arnold Schwartzenkoph
"Those who know don't talk and those who talk don't know." -Jeff