# TTD Question

Thursday, January 27, 2005 3:47 PM
I was wondering if anyone know the circumfrine of the hydraulic drum for TTD. I'v been looking around for it but it seems that they like to keep info like that confidential. Thanks
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Thursday, January 27, 2005 5:07 PM
Why, building one yourself?
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Thursday, January 27, 2005 10:01 PM
What I was doing is designing a "fantasy" rocket coaster on autocad and was interested to find out how many time the drum would have to turn in order to reel in the amount of cable as fast as it does. If i can find out what the radius or the circumfrince is i can figure it out with a little mathematics. I was just curious, couldn't find it anywhere on the net with searchs and figured maybe someone here would know. If you want to close this thread thats fine i understand its not really that important, but at the same time it would be information that i would like to obtain.

Thanks

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Thursday, January 27, 2005 11:48 PM
In some news report back in 2003, Monty Jasper was quoted as saying that the drum spins up to 500rpm. Equating 500rpm and 120mph gives:

d=(120*5280)/(500*pi*60)=6.723ft or 6' 8.672"

I personally am 6'2", and having stood next to the drum in the hydraulic room, I can attest to the fact that it is a little bit taller than me.

While that probably isn't the precise dimension, it should be enough for you to create a reasonable autocad model.

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Friday, January 28, 2005 1:57 AM
wow. math can be cool. too bad I don't understand what u did :)
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Friday, January 28, 2005 3:00 AM
Purdue University Engineer..

remember that TTD's actual launch speed is variable. Most times I was there I saw between 122-124. I think I saw 121 twice. IIRC, it rolled back both times, too.. hmmm...

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Friday, January 28, 2005 7:12 AM
It's also made it over at 119 before ;) Wind can be a b***h. But there are definitely days that it averages 122 or higher.
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Friday, January 28, 2005 7:52 AM
The geekiness (is that a word?) never ceases to amaze me.
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Friday, January 28, 2005 8:12 AM
I'd think that the number provided should be a good estimate to make a "fantasy" coaster... and gee if it don't work spin the drum a little faster... or bang on it all day?
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Friday, January 28, 2005 1:13 PM
Well thanks alot guys, i reason that i asked this was becasue the drum that i had designed had a 31' diameter, witch gives it a 92' circumfrence ( spelling) with all of the mathematics done to it equals about 500mph, for 4 seconds witch is rediculis (spelling). So i figured i would ask the pros. thanks alot guys i can refigure everything to be more realistic.
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Friday, January 28, 2005 1:18 PM
Yea, lets not get too picky because he did say "While that probably isn't the precise dimension, it should be enough for you to create a reasonable autocad model."
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Saturday, January 29, 2005 12:47 AM
What is the formula for the circumfrince of a circle? Or the circumfrence, for that matter? "Witch" may be something like the circumference? Sorry, MForce, just having some "ridiculous" fun with you. Couldn't resist.

And one thing I want to see on this site is mooooooooooooore--- decimal places. A mere three will never do. Pshaw!

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Monday, January 31, 2005 10:06 AM
Lisa--I can't believe you found a practical use for geometry

(Bart from the classic episode where he enters the minature golf tournament).

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