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01-03-2007, 03:47 PM | #41 | |
MODERATOR™ Join Date: Jul 2004 Location: Ohio
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Typically, a race car's CG is really low, so their links need to converge at a low point to achieve the results they're looking for. Typically, a crawler's CG is higher than a really low race car's CG, though the link angles will still be relative to the IC & CG & NL to achieve the results we're looking for. Point of convergence, relative to the IC & CG. Last edited by EeePee; 01-03-2007 at 03:51 PM. | |
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01-03-2007, 03:50 PM | #42 |
MODERATOR™ Join Date: Jul 2004 Location: Ohio
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Cole you know what this makes me think of? A full suspension mountain bike that puts the rear lower pivot inline with the middle chainring. And when you shift into the smallest ring, it'd mechanically pull the rear tire inward, planting it into the ground. Or when you put it into the big ring, you get some squat effect bouncing. |
01-03-2007, 04:18 PM | #43 | |
TEAM MODERATOR Join Date: May 2004 Location: Tennessee
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If it was easy......there'd be girls building the rigs for us. Girls build the easy rigs | |
01-03-2007, 04:25 PM | #44 |
I wanna be Dave Join Date: Jul 2005 Location: Cedar Rapids
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I know exactly what you are talking about on the FS MTB. I'm thinking of it as if your bottum rear link is below the center line of the axle. Asuming that is where the up ward torque of the axl is coming from. The higher above that point your link is. the more torque it is putting on the links. So you have more anti squat forrce applied to the suspensiuon the further up your links are mounted. Then you have to make them have less anti squat to get the same leverage as if it was lower on the axles. I'll draw a picture as that was ????????? Lets say the yellow links intersect in the same place as the black one. Won't the yellow links have more leverage on the axles making it have antisquat. If so then the 100% nuetral number mena nothing and that's what the suspension calculator bases there design around. Last edited by Cole82; 01-03-2007 at 04:30 PM. |
01-03-2007, 04:44 PM | #45 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
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If the yellow and black links converged at the same points your AS would be the same (with no articulation). The roll center of the axles would be different though, so the axle would articulate along a different path.
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01-03-2007, 05:34 PM | #46 |
I wanna be Dave Join Date: Nov 2006 Location: spring hill TN
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Timmy's 1.1 buggy does have plenty of seperationon the on the front bars and there is not a 5th link.The upper is above centerline of the rockwell axle as a matter of fact all the bars are above the centerline of the axle.The link setup is double triangulated front and rear and has almost no flex steer. As far as added stress goes timmy will beat a rig harder than i have ever seen anybody in my life.Every thing on this one is built very stout.The heims are 1 1/8 joints using a 2 inch DOM tubeing for the bars,all mounting points are 1/2 plate that is gusseted in every way possible,the axles are 2 1/2 ton rockwells with chromoly shafts,the trans is a coustom th400,transfer case is a atlas with the biggest input and output shafts they offer and still breaks.The little alum.headed 383 he run year did not make enough so he put a ramjet 502 in this one. I will get some better pics when it gets back from powder coat and the other parts get back from paint. To date the buggy has coast timmy about 65,000 with out powder coat and they started on it about 2 months ago so i am sure ther is a few more $ to be spent. Here is a picture of timmy beating the crap out of a friends rig i will also see if i can dig up some pics of the rig he run last year just so you can see how he will test the link mounts. |
01-03-2007, 06:05 PM | #47 |
I wanna be Dave Join Date: Nov 2006 Location: spring hill TN
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Here is a link to a short vid of dan on a local trail and let me tell you timmy is way harder on a rig than dan.There is a little foul language in the vid so watch it around the kids. http://www.fototime.com/ftweb/bin/ft...reenheight=768 |
01-03-2007, 10:43 PM | #48 |
I wanna be Dave Join Date: Jul 2005 Location: Cedar Rapids
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I did some testing with the unsymmetrical link suspension. I switched out springs so it would have such bad torque twist it lifted the one front tire. I moved the rear suspension so it has one top link below the servo mount and one above. Doing this eliminated the torque twist. I mean Zero flat as can be. In theroy you should be able to run a softer spring and still not get torque twist. |
01-04-2007, 08:57 PM | #49 | |
TEAM MODERATOR Join Date: May 2004 Location: Tennessee
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What shafts are you running? They look like miniature Revo shafts. Do they have an index spline? | |
01-04-2007, 09:02 PM | #50 | |
I wanna be Dave Join Date: Jul 2005 Location: Cedar Rapids
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They are revo shafts. They have 8 or so ridges evenly spaced apart. | |
01-04-2007, 09:03 PM | #51 |
Web Wheeling Join Date: Jan 2005 Location: Twin Cities
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Cole, aren't those Jato shafts?
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01-04-2007, 09:08 PM | #52 |
I wanna be Dave Join Date: Jul 2005 Location: Cedar Rapids
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Woops sorry you right. I'm really tired at the moment. |
01-04-2007, 09:21 PM | #53 |
TEAM MODERATOR Join Date: May 2004 Location: Tennessee
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I was gonna say,they look awefully small to be Revo's. So,anyway you slide together they slide with ease? Revo's will go together anyway you like. They have an index spline,can't really tell which one it is. If you don't assemble the shaft on the right index,they are harder to slide together. |
01-04-2007, 09:25 PM | #54 |
I wanna be Dave Join Date: Jul 2005 Location: Cedar Rapids
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Man you made me get the allen wrench out to take the shaft out and see. There is NO indexing. |
01-04-2007, 09:37 PM | #55 |
Web Wheeling Join Date: Jan 2005 Location: Twin Cities
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Cole, pretty sure there is a notch on the Jato shafts as well. Just keep the ears lined up, and they will work fine. If you clock them, you will notice they are a little tighter.
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01-04-2007, 10:06 PM | #56 | |
TEAM MODERATOR Join Date: May 2004 Location: Tennessee
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Sorry bud,didn't mean to aggravate ya I'd like to find a shaft thats smaller than the Revo's,dang near as strong and with no index(for a dig set up ) | |
01-05-2007, 06:18 AM | #57 | |
I wanna be Dave Join Date: Jul 2005 Location: Cedar Rapids
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Etype R is right. Allright afdter checking it out this morning when I'm not a sleep at the wheel. It has 180deg Indexing. The yokes allways line up with each other. Last edited by Cole82; 01-05-2007 at 06:22 AM. | |
01-05-2007, 04:00 PM | #58 | |
Keep it real Join Date: Jun 2006 Location: Yakima,WA
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01-05-2007, 06:29 PM | #59 | |
PapaGriz Yo Join Date: Apr 2004 Location: In the garage building the wife a crawler
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I'm going to experiment with this asymetrical setup to see if I can fix my torque lift. Thanks for the great info guys. | |
01-06-2007, 03:26 PM | #60 |
I wanna be Dave Join Date: Jul 2005 Location: Cedar Rapids
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To show what good suspension tuning can do. Before it was tuned, this 65deg incline was inpossible. Couldn't even ramp up it. Now after several hours of theory and testing. I can both crawl up this and ramp up it nothing else on the truck has changed just link placment.
Last edited by Cole82; 01-06-2007 at 03:34 PM. |
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