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Old 10-16-2007, 11:13 PM   #11
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Re: Kinetic Sculpture Racing - Millicent's purpose in life


There is just no resisting these two shots by Tina Kerrigan -- from the Corvallis, Oregon, race this summer. Yes, we have fun!




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Old 10-16-2007, 11:24 PM   #12
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Re: Kinetic Sculpture Racing - Millicent's purpose in life

Does that one perhaps suffer from a bit of a frame torsion problem or is that just suspension? Axle articulation with chaindrives is beyond the scope of what I'm comfortable designing.

Where do you keep finding these dirt track tires at?
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Old 10-17-2007, 12:07 AM   #13
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Re: Kinetic Sculpture Racing - Millicent's purpose in life


Actually, chains are remarkably tolerant of twisting. Some guys twist a chain 90 degrees instead of using bevel gears!

But in that photo, what you are seeing is the suspension at work, and there is NO twisting of the chains. This vehicle is hinged in the middle. Actually, not just hinged, but articulated with three ball joints and a link, so the two halves can twist in relation to each other, keeping all four tires on the ground on any terrain. Nothing moves in the drive mechanisms - relative to suspension and steering. This system is often used on heavy equipment, like earth movers and front end loaders.

A "bonus" is that I'm steering it from a rear seat -- which was simply where it was easiest to mount the steering rack.

The tires are from Sprint Cars -- those 800 HP thingies with a giant square wing on top. I just pick up discarded tires after the races -- most of mine are from my local World Of Outlaws race a couple of years ago. (I work as a motor sports journalist on the side, so I have better access than the average guy, but the tires get thrown away, so anybody can get some.)
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Old 10-17-2007, 12:43 AM   #14
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Re: Kinetic Sculpture Racing - Millicent's purpose in life

Coolness on the link engineering. More pics perhaps? It's the mechanicals of these things that gets me interested.

Those World of Outlaws guys have a bigger checking account than most of hte racers I've seen I think. The WISSOTA guys don't get rid of a tire until it flat out won't hold air anymore (and sometimes longer). Even after that much of their life is gone they end up (shhhh) using them as fire starters because their nylon bias ply construction and soft rubber compound burn exceptionally well without leaving a wiring mess. Heck, I think even the IRA Outlaw Sprint guys pack that stuff home.

I'm a huge dirt track fan. My ultimate racing preference has always been for down and dirty drag racing...but those circle track guys come darn close to doing just that and I can't help but have respect for a guy that is a team owner, crew chief, public relations liaison, and driver all while still putting in 40 hours per week at the office.
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Old 10-17-2007, 12:50 AM   #15
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Re: Kinetic Sculpture Racing - Millicent's purpose in life


Quote:
It's the mechanicals of these things that gets me interested.
You know it!

I'll take pics of the articulated chassis tomorrow. Meanwhile, here is a Sprint Car I shot some years ago -- for those who would like to know what we are talking about.

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Old 10-17-2007, 11:59 AM   #16
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Re: Kinetic Sculpture Racing - Millicent's purpose in life

Ever gotten a good look inside one, Elliot? I don't know how those guys do it. Even guys that are my Shrek-ish size seem to fit yet they don't even have room for pedals. The gas and brake are just kind of sliders on the floor. 120 mph in the straights, a single glowing orange brake rotor, no clutch or transmission even to speak of...it's like death on 4 wheels and pretty darn cool if you ask me.
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Old 10-17-2007, 02:22 PM   #17
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Re: Kinetic Sculpture Racing - Millicent's purpose in life


Ah, here we are:



There is the answer to “where do those tires come from?” I use those Right Rear tires. Sprint Cars have no differential, so they have a LOT of “stagger”.


Oh, and as for the cramped cockpit of a Sprint Car... well, it ain’t a living room, but I managed to fit:



In fact, I found myself steering with my fingertips -- walking the steering wheel thru my hands with my fingertips -- after just a few laps. Of course, it might be different at racing speed! (This was about ten years ago, when I wrote a story on Jimmy Sills and his racing school. Yeah, tough work, but it needs to be done.) I do see top drivers at speed with their hands in their lap, apparently cruising comfortably.
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Old 10-17-2007, 10:10 PM   #18
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Re: Kinetic Sculpture Racing - Millicent's purpose in life


Here is the steering pivot on "Henry Ford Goes Surfing":



The single ball joint is at the top, and the link with two ball joints is at the bottom (the only part that looks somewhat clean). The parts are agricultural tractor/plow hardware from Tractor Supply Co. The steering link is in the background -- it's simply one end of a rack-n-pinion from a small car.
I don't know if this is understandable?
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Old 10-17-2007, 10:45 PM   #19
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Re: Kinetic Sculpture Racing - Millicent's purpose in life

It makes sense to me. Thanks for the pictures.

What's with Millicient's white forehead? She's starting to look WAY too Prevost.
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Old 10-18-2007, 12:42 AM   #20
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Re: Kinetic Sculpture Racing - Millicent's purpose in life


Prevost Marathon -- $700.000 to $1.5 million. Prevost good.

Millicent soon all white, then we start decorating....
I just watched a documentary film where they visited Ken Kesey on his farm in Oregon, circa year 2000 -- with Further parked indoors in mint condition! Presumably, that's the second or third Further -- I think the original is in tatters.

One more Kinetic race this year: Ventura, Southern California, October 27.
Millicent needs heaters reconnected for night travel in late October!
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