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PKI UPDATE?


Dino2003
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"The restraints on Vortex hurt your collar bone because they aren't OTSRs at all. They're horsecollar restraints. "

Last time I checked, they went over my shoulders :) IMO a horsecollar and OSTR is a "like" term... same thing.

As far as the positive/negative g thing.....

A positive g is the force pushing you down in your seat when the gravitational pull increases. Positive G = the gravitational pull on your body is increased.

A negative g is the force pulling you up out of your seat when the gravitational pull is contradicted. Negative G = the gravitational pull on your body is decreased.

On Delirium for instance, you will feel positive g's at the base of the swing. At the higher points of the swing you will feel negative g's.

Negative g's are more commonly referred to in enthusiast circles as "airtime."

However, rides that have inversions or make arc movements like Delirium or looping coasters also rely on another force.... centrifigal force. Centrifigal force is an intertia that contrasts the gravitational pull on an object. So as you swing in an arc, or manuever a loop it pulls outward from all directions. That is what holds you in your seat while going upside down or holds change in your pockets when going fast through a loop.

Using the bucket full of water idea... as you swing it rapidly upside down, centrifigal force holds the water in. But if that motion is slowed or halted, then gravity becomes the stronger force and the water will spill out. Centrifical force relies on speed and heavy inertia to override gravity.

This basic idea explains how some coasters loops really pull enough force to not need restraints, while others do not pull enough and rely on restraints to hold riders in. Think of The Vortex... the vertical loops pull enough centrifical force to keep you in your seat. However the corkscrew is much slower so gravity takes control and your body relies on the restraint to hold you in.

Shaggy

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One other little tidbit of useless information while we are on the topic of centripetal, and centrifical force. On a perfectly round vertical loop (360 degrees, and not tear drop shaped like most loops are) you are 6 G's its proven through physics.

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Thanks for the Physics lesson Shaggy! Thats funny because right now in my Physics class we are learning g's centrifical force, newtons, acceleration, speed, all the good stuff. Our book is littered with pictures of coasters, but no names. <_<

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OTSRs, and Horse collars are the same to me, they both go over my shoulders, but there is a slight deifference, which has to do with viewing.

However the dicitonary on Coasterglobe says this,

Horsecollar - A type of restraint that swivels down and over the shoulders. Not to be confused with an OTSR.

OTSR - Acronym for Over The Shoulder Restraint. A type of restraint that comes vertically down over riders' shoulders. These allow for a better view than horsecollars.

Call them wnat you want, but as far as im concerned teh 2 terms are interchangable.

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Yes, and thats been my arguement, as long as i've been bob dole, or theataris, but somebody (I can't remember who) fought me forever about this, saying that they were not interchangeable. I have a few ideas, but i'm not going to just accuse anyone. Not out to offend, just to have a little fun. We will see if I am right, because the two people I am thinking of don't hesitate to post.

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