G-forces

I am currently recreating the Manta at Sea World orlando but i was wondering if anyone knew what kind of g-forces it should have in the pretzel loop? I already know heights but not forces. thanks.

Anywhere from 4.2 to 4.6 ought to be reasonable.

Originally posted by Kevin Brennan

4.2 to 4.6.

WOAH, wait...it's that strong? No way, that's immense; so much for a family ride

wow.... i had heard the max force on the whole ride was only 3.7.

[Brtnboarder495]

How are you recreating it? Using the Vekoma flying track type?

Anyways, I doubt it crosses 4 G's. Most fliers tend to have fairly gentle G's.

they do... especially since the force feels magnified by the flying position. No I am using the 4 seat inverted B&M track because I only have version 1.55 currently. I am trying to upgrade but I have to purchase some other unrelated things first. I am also trying to use newton 2 for some assistance to help smooth the track.

[Brtnboarder495]

I just tested it in the editor using a 20 mph entry speed with a tighter radius and the G's barely went over 3.

Yeah that sounds about right. I just found a vid where seaworld claimed the force was around 3. Thanks

But remember guys...the G Forces while vertical in relation to train are horizontal in relation to YOU.

The G's become Acceleration G's and the body can tolerate a LOT of those if applied smoothly. Quickly and you can tear crap in your eyes and other places but since the time its held isnt very long I would think 4 is just about right. It becomes not so easy to keep breathing at the base.


Anyways, Ill be on Manta Saturday so Ill know more recently how intense I think it is.

Wikipedia reports the max G force on the ride is 3.7.

i know it does but i dont know where that max occurs

[Brtnboarder495]

Originally posted by dah137

i know it does but i dont know where that max occurs

Exactly, it could occur on one of those turn arounds.

Unless you're recreating, I'm sure no one would give you crap if they stayed below 4.

Wikipedia isnt reliable. Who quoted that as the source? Thats far more important.

[gouldy]

Surely on a B&M flyer, the Forces don't even approach 4? That's just my understanding, but if designing a Flyer, especially a B&M Flyer, I would only ever go up to 4 on a lay down part of the ride. The flying sections surely don't even get close to that?

If they were to approach 4 on a flying part, it would be very intense and probably uncomfortable.

Originally posted by Real

Wikipedia isnt reliable. Who quoted that as the source? Thats far more important.

That's mainly why I mentioned it's from Wikipedia, but it was the only source that i found that would give me info.

[Brtnboarder495]

While I understand why most don't trust wikipedia, it's not like 3.7 G's would be unrealistic. Maybe this will help:

Q: How does the lie-down dynamic change the safety tests performed? Does it affect the maximum allowable G-forces on the body? Also, what is the standard Safety Factor for a roller coaster like Manta? This one's a bit of a nerdy engineer question, but I'm curious.

A: Answered by Mike Denninger Dir of Corp Rides and Maintenance

While the prone ("flying") riding position of Manta puts riders in an orientation that differs from many other coasters, it does not alter the orientation of the axes by which biodynamic accelerations are measured.

Great second question! The "flying" riding position of Manta reveals that the accelerations traditionally experienced by a rider on a sit down coaster like Kraken, are experienced quite differently when "flying" on Manta. For example, at the bottom of Kraken's large initial loop (after the first drop) a vertical acceleration in the rider's "eyes-down" or "z" direction is experienced. This makes the rider "feel" like they are "heavy". Now comparing to Manta, at the bottom of the dive loop (after the initial drop), a similar vertical acceleration as on Kraken is experienced, but this time the rider is "flying" on their back at the bottom of the loop, and the acceleration is experienced in the "eyes-back" or "x" direction by the rider. So instead of "feeling" heavy, the rider experiences a unique feeling of being "pulled" into the back of their seat. You might relate this feeling to that of accelerating in your automobile on the highway, and being pushed into the back of your seat. As you can see, this rotational difference of the coordinate system results in the need to review biodynamic measurements differently for a "flying" coaster like Manta than for another coaster like Kraken.

With regard to maximum allowable G-forces, ASTM International has published a Standard that details the specifics of acceleration limits for all types of rides and we always adhere to all standards.

Bolliger and Mabillard Consulting Engineers Inc., the same team of engineers and designers that worked on Montu, SheiKra, Griffon, Apollo's Chariot and other world class coasters in our parks, performed the engineering, design, and fabrication work for Manta. While Manta is a uniquely SeaWorld attraction, it is first a very safely-designed attraction. In addition to the exceptional engineering, calculations, and design work required to fabricate and construct Manta, sufficient safety factors were applied in all respects to the many systems operating on this great ride.

- http://www.themeparkinsider.com/flume/200905/1194/

Wow.

Nice find, can't get any better than that quite honestly![:D]

nice find. they should hand out those ASTM International stats to everyone. It would really come in handy.