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Post by Crash Enburn on Mar 22, 2017 12:10:40 GMT -5
Why is it that the shape on a standard car (BASX, Street Stock, etc.) is a plank, but the bodies on the Eliminator/Unlimited classes are often shaped?
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Post by Vitamin K on Mar 22, 2017 12:12:35 GMT -5
Why is it that the shape on a standard car (BASX, Street Stock, etc.) is a plank, but the bodies on the Eliminator/Unlimited classes are often shaped? I was wondering the same thing myself. Unless it's a phallic thing. The Zeebzob wanna come clean about the real reason Floyd is pink? |
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Post by Crash Enburn on Mar 22, 2017 12:16:22 GMT -5
 Bwahahahahaha!
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Post by micro on Mar 22, 2017 12:51:18 GMT -5
I think more are going back to a plank as that is what the leading cars are now.
When Floyd was the fastest people copied that. Now that Floyd is.....well I have never beat Floyd.
Floyd is still fast in my book.
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Post by The Zeebzob on Mar 22, 2017 13:16:46 GMT -5
Why is it that the shape on a standard car (BASX, Street Stock, etc.) is a plank, but the bodies on the Eliminator/Unlimited classes are often shaped? I was wondering the same thing myself. Unless it's a phallic thing. The Zeebzob wanna come clean about the real reason Floyd is pink? I have been using that shape just because it was successful. Now that its been beaten pretty handily, I am making planks. Goat Boy dominated with that shape starting in about 2011 or so, I have been using it since then as well. The reason Floyd is pink is so I can see it easily when watching the live feed. |
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Post by Professor Moriarty on Mar 27, 2017 23:34:15 GMT -5
OK Andy,
It is time to demystify these bearing cars that intrigue you so.
Now then... It is no secret that you discovered that: When you cut smaller wheels for your bearing cars, they ran faster.
I will ask what your theory is on this phenomenon... but more importantly... since the topic is "car bodies"...
How does one go about weighting a body that has wheels less than an inch in diameter?
Does one go with the fat route? .375" thick at the ass end?
Or... Does one hang that ass out further back than the wheels?
Or both?
Thanks,
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Post by The Zeebzob on Mar 27, 2017 23:43:49 GMT -5
OK Andy, It is time to demystify these bearing cars that intrigue you so. Now then... It is no secret that you discovered that: When you cut smaller wheels for your bearing cars, they ran faster. I will ask what your theory is on this phenomenon... but more importantly... since the topic is "car bodies"... How does one go about weighting a body that has wheels less than an inch in diameter? Does one go with the fat route? .375" thick at the ass end? Or... Does one hang that ass out further back than the wheels? Or both? Thanks, Small wheels weigh less than the old wheels, which were typically about 1.150 - 1.200 inches. In 2015, the wheels I ran at the Nats were .900". The combined weight of my 3 wheels were about equal to one if the old ones. This affected the moment of inertia...lighter wheels take less energy to get rolling. To weight it, move the wheels as far back as possible with no weight hanging out back. Drill the axle hole as low as possible to allow for rail clearance. Never measured the thickness, but the quarter inch cubes plus the tungsten plate would be a typical build. |
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Post by Professor Moriarty on Mar 28, 2017 0:05:01 GMT -5
Amazing! MOI wins the day!
I betcha everybody wants to know what the next material will be. If it can be lighter than the acrylic ones being used... then that person would have quite an advantage.
We need to start a photo section for each car class. This way we can post car photos from other forums and dissect what is going on.
The MOI really makes me think back to those old style BSA wheels...
HAHAHA! That was probably my favorite post ever when I spilled the beans on those old BSA wheels. (You're welcome Dud)
QT was the one that accidentally gave away the secret when he ran some Pinecar wheels in SS and came within a hair of his fastest time on BSA wheels.
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Post by The Zeebzob on Mar 28, 2017 0:21:09 GMT -5
A while back I tried some different materials. I tried G10 once and really thought I might be onto something. It was slightly heavier than acrylic, but it was so stiff, I could cut it really thin! The problem however, was because its a glass reinforced resin, I was unable to get the edge smooth enough. It sounded like a jet engine going down the track. That stuff was so tough, one wheel completely dulled my cutting tool.
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Post by Professor Moriarty on Mar 28, 2017 0:57:56 GMT -5
Interesting...
I betcha it is because it is made of glass layers?
Do thermoset plastics usually cut well?
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Post by micro on Mar 28, 2017 8:03:59 GMT -5
A while back I tried some different materials. I tried G10 once and really thought I might be onto something. It was slightly heavier than acrylic, but it was so stiff, I could cut it really thin! The problem however, was because its a glass reinforced resin, I was unable to get the edge smooth enough. It sounded like a jet engine going down the track. That stuff was so tough, one wheel completely dulled my cutting tool. Interesting...I tried Ultem with no Glass, which is harder as well and slightly heavier. That was a lot louder too and not as fast. |
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Post by Crash Enburn on Mar 28, 2017 9:48:41 GMT -5
...but the quarter inch cubes plus the tungsten plate would be a typical build. So, you put this plate below the tungsten cubes? So your car wound up near 3/8" at the ass end?  I am quite surprised by this. And a thought on aero: Have you considered putting a thin mini-fender to deflect air around the hub? |
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Post by The Zeebzob on Mar 28, 2017 9:56:04 GMT -5
...but the quarter inch cubes plus the tungsten plate would be a typical build. So, you put this plate below the tungsten cubes? So your car wound up near 3/8" at the ass end? I am quite surprised by this. And a thought on aero: Have you considered putting a thin mini-fender to deflect air around the hub? If I remember correctly, Floyd had a row of 1/4" cubes at the back, then a row of 1/8" cubes, then the wood for the axle. The center of the axle is probably a little less than 1/2" from the rear. I know there is a plate on top, I can't remember if I put one underneath or not. As far as thickness, I'm not as concerned because the extra rearward weight seems to offset any aero disadvantage. Never did any fender work on an unlimited. It's one of the reasons I like this class. Fender work sucks. |
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Bwahahahahaha!
I am quite surprised by this.