Crosskart Xtreme best center of gravity height?
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Re: Crosskart Xtreme best center of gravity height?
Maybe you could redesign the rear suspension so the brakes have anti-dive, preload it on the brakes for the launch and make it squat.
Re: Crosskart Xtreme best center of gravity height?
Any added weight above minimum rule requirement raises the cog which should always be as low as possible.ptuomov wrote: ↑Sat Dec 23, 2023 10:22 amThe cart is an older, lighter model that we bought from a heavier driver and our driver is young and light (and very fast). Consequently, we can install heavier components anywhere as the previous owner got the cart without a driver as light as possible, to the edge of reliability. This gives us some ability to shit the center of gravity height, from installing a heavier rear wing to adding lead plate ballast to the floor plate.
The ground clearance is measured at the end of the suspension travel if I recall correctly. Since the springs are free, it's not usually bottoming; except in the big jumps on some of the Swedish tracks.
Added weight is for front to rear balance or side to side balance.
If you want to add weight for the starts put it as far back as possible that way you won't need to add much.
Ignorance leads to confidence more often than knowledge does.
Nah, I'm not leaving myself out of the ignorant brigade....at times.
Nah, I'm not leaving myself out of the ignorant brigade....at times.
Re: Crosskart Xtreme best center of gravity height?
Assume that the car is always at the minimum weight. There's enough flexibility to move weight around.
My question is at which point is it better to improve the traction at start by moving CG towards rear vs. moving CG up?
Both will improve traction at the start, but one may hurt the flying lap more than the other per improvement at the start.
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Re: Crosskart Xtreme best center of gravity height?
ptuomov wrote: ↑Sat Dec 23, 2023 4:18 pmAssume that the car is always at the minimum weight. There's enough flexibility to move weight around.
My question is at which point is it better to improve the traction at start by moving CG towards rear vs. moving CG up?
Both will improve traction at the start, but one may hurt the flying lap more than the other per improvement at the start.
As low as is practical, as far back as possible.
Ignorance leads to confidence more often than knowledge does.
Nah, I'm not leaving myself out of the ignorant brigade....at times.
Nah, I'm not leaving myself out of the ignorant brigade....at times.
Re: Crosskart Xtreme best center of gravity height?
Why is that obvious?
Paradigms often shift without the clutch -- https://www.youtube.com/watch?v=cxn-LxwsrnU
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Re: Crosskart Xtreme best center of gravity height?
Paradigms often shift without the clutch -- https://www.youtube.com/watch?v=cxn-LxwsrnU
https://www.instagram.com/ptuomov/
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Re: Crosskart Xtreme best center of gravity height?
Do u have a link to the official Extreme kart rules you can share with us?
Re: Crosskart Xtreme best center of gravity height?
Paradigms often shift without the clutch -- https://www.youtube.com/watch?v=cxn-LxwsrnU
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Re: Crosskart Xtreme best center of gravity height?
My observation and logic says that the factory designed the roll center geometry as if the car would be a front-wheel drive car. They is, a higher roll center in the rear than in the front. This is necessary as the lack of differential means the inner rear tire must lift and slip in turns.
Paradigms often shift without the clutch -- https://www.youtube.com/watch?v=cxn-LxwsrnU
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Re: Crosskart Xtreme best center of gravity height?
Images of how a front-wheel drive car is set up and how this crosscart appears to be designed from the factory:
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Paradigms often shift without the clutch -- https://www.youtube.com/watch?v=cxn-LxwsrnU
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Re: Crosskart Xtreme best center of gravity height?
In the vast majority of cases the rear roll centre is higher than the front, in both FWD and RWD vehicles
Very rarely is it the other way round, IIRC mostly rear engined
I've come across various reasons why this would be so, but 'feel' near the limit is generally more natural for the driver when set up this way
Very rarely is it the other way round, IIRC mostly rear engined
I've come across various reasons why this would be so, but 'feel' near the limit is generally more natural for the driver when set up this way
Re: Crosskart Xtreme best center of gravity height?
Identify the handling problems then address them.
1. Reduce start line wheel spin.
2. ?
1. Reduce start line wheel spin.
2. ?
Ignorance leads to confidence more often than knowledge does.
Nah, I'm not leaving myself out of the ignorant brigade....at times.
Nah, I'm not leaving myself out of the ignorant brigade....at times.
Re: Crosskart Xtreme best center of gravity height?
I drive a lot of Porsches (not well or fast) and I think those have the roll center higher in the front than in the rear.BCjohnny wrote: ↑Sun Dec 24, 2023 3:03 pm In the vast majority of cases the rear roll centre is higher than the front, in both FWD and RWD vehicles
Very rarely is it the other way round, IIRC mostly rear engined
I've come across various reasons why this would be so, but 'feel' near the limit is generally more natural for the driver when set up this way
I think that the track cars that lift the front wheel when cornering on track likely have the front roll center higher than rear roll center. All those cool photos with the inside front wheel in the air…
https://www.thedrive.com/guides-and-gea ... -cornering
“Picking up a wheel, inside front (typical BMW) or inside rear (most FWD cars), is a natural occurrence of dynamic weight transfer," Rodriguez said. "It is not necessarily a bad thing. You know it's going to happen and just drive through it."
Paradigms often shift without the clutch -- https://www.youtube.com/watch?v=cxn-LxwsrnU
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Re: Crosskart Xtreme best center of gravity height?
2. Without seriously increasing the flying lap times. Currently the car is basically as good over a flying lap as our noob moron setup skills can ever get it.
Paradigms often shift without the clutch -- https://www.youtube.com/watch?v=cxn-LxwsrnU
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Re: Crosskart Xtreme best center of gravity height?
Roll center.
Cars don't body roll around a center that's on the centerline of the chassis.
These ones almost did, until they start to roll and the slides on an angle.
Cars don't body roll around a center that's on the centerline of the chassis.
These ones almost did, until they start to roll and the slides on an angle.
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Last edited by Tom68 on Sun Dec 24, 2023 5:52 pm, edited 1 time in total.
Ignorance leads to confidence more often than knowledge does.
Nah, I'm not leaving myself out of the ignorant brigade....at times.
Nah, I'm not leaving myself out of the ignorant brigade....at times.