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Old 10-19-2006, 03:23 AM   #6541
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I actually feel dumber reading your last few posts ASW.

The CG can move. It is not a fixed point.
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Old 10-19-2006, 03:34 AM   #6542
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Run a lower ride height and you will lower your CG.


Place lead weights on your chassis and you will lower your CG.


Remove weight from the upper deck and you will lower your CG.


Switch to a different brand of radio gear and you will move your CG, not always up or down but sideways too.
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Old 10-19-2006, 03:37 AM   #6543
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Given the fix location of upper deck and fix location to put all the hardwares ( not to mentioned those hardwares are bolt on to upper deck ) please explain to me how are you going to change the CG of the car ?
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Old 10-19-2006, 03:38 AM   #6544
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My goodness.... you are so fast to answer before my questions.
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Old 10-19-2006, 03:53 AM   #6545
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This will help clarify the center gravity issue for everyone:

http://members.aol.com/sccacuda/cars/4SmthTa.html

Additional Resources/Examples:

http://www.nesea.org/transportation/...0via%20EVC.pdf

http://www.longacreracing.com/articles/text/CGH_p.htm

It would be good if everyone tried to help each other understand how these things work, instead of arguing who is right and who is wrong.
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Last edited by rmdhawaii; 10-19-2006 at 04:13 AM.
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Old 10-19-2006, 03:57 AM   #6546
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I will try Ti screws and lightweight gear houses.

Which do you use clutch shoe?I use only black one.I think Red clutch shoe more durable than yellow and black.But their clutch grab different.
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Old 10-19-2006, 04:10 AM   #6547
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Quote:
Originally Posted by Scott Fisher
The CG of the car is not fixed and can be raised or lowered.
hey Scott,i thot the CG is fixed but the RC changes up or down, this is what i was told,is this wrong,and how do you change CG on a car thx,
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Old 10-19-2006, 04:12 AM   #6548
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Quote:
Originally Posted by mydo84
I will try Ti screws and lightweight gear houses.

Which do you use clutch shoe?I use only black one.I think Red clutch shoe more durable than yellow and black.But their clutch grab different.
yellow is very good,stock is grey and works fine,the others i dont like.
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Old 10-19-2006, 04:14 AM   #6549
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Quote:
Originally Posted by rmdhawaii
This might help clarify the center gravity issue for everyone:

http://members.aol.com/sccacuda/cars/4SmthTa.html

Additional Resources/Examples:

http://www.nesea.org/transportation/...0via%20EVC.pdf

http://www.longacreracing.com/articles/text/CGH_p.htm

It would be good if everyone tried to help each other understand how these things work, instead of arguing who is right and who is wrong.
ahhhh this is good,you guys allways find the good stuff for us to read.
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Old 10-19-2006, 05:09 AM   #6550
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Quote:
Originally Posted by wallyedmonds
hey Scott,i thot the CG is fixed but the RC changes up or down, this is what i was told,is this wrong,and how do you change CG on a car thx,
I'm pretty sure MTX4' CG is fixed even if you have the ability to lower your radio equipments ultra low. Unless you significantly reduce the total weight of the car, only then the location of CG will be change to a new location.

After looking at the CG equation, 3 parameters are count : loads on each wheel, wheelbase, and trackwidth. ( Raising or lowering radio equipments are not count in equation). When we change the weight of the car, only then there is possibility you change the loads on each wheel, and thus change the location of CG. It's either going forward or backwards, or slightly off center between left and right.

Are we getting wrong perception about CG ? People always thought changing locations ex. lowering radio equipments and using Ti screws on upper deck would lower the CG value. Infact CG value is actually a location around the chassis.

I guess we were wrong

Okay guys..... I stop here..... what a day in office

I have to go to Airport and see you soon in 9 days.

Ciao !!!
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Old 10-19-2006, 05:32 AM   #6551
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CG is NOT only related to where the mass is. It also related to how heavy the mass is! If you run a heavier chassis like 4mm one. The CG is lowered.

And that's only when everything static on ground.

Also, the link (http://members.aol.com/sccacuda/cars/4SmthTa.html) only tell the CG on front/rear. Where most of people said "lower CG" is the CG in height. Like I said, CG is a point in 3D space.

In fact I prefer to use CM (Center of Mass) rather than CG. CG is more like the projection of CM on designated dimension. But that's a bit complex than just refer "CG".
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Old 10-19-2006, 05:41 AM   #6552
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Quote:
Originally Posted by asw7576
Are we getting wrong perception about CG ? People always thought changing locations ex. lowering radio equipments and using Ti screws on upper deck would lower the CG value. Infact CG value is actually a location around the chassis.

I guess we were wrong
Before you draw that conclusion, you should try some experiments and take a look at the results.
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Last edited by rmdhawaii; 10-19-2006 at 03:19 PM.
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Old 10-19-2006, 05:46 AM   #6553
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Quote:
Originally Posted by ttso
CG is NOT only related to where the mass is. It also related to how heavy the mass is! If you run a heavier chassis like 4mm one. The CG is lowered.

And that's only when everything static on ground.

Also, the link (http://members.aol.com/sccacuda/cars/4SmthTa.html) only tell the CG on front/rear. Where most of people said "lower CG" is the CG in height. Like I said, CG is a point in 3D space.

In fact I prefer to use CM (Center of Mass) rather than CG. CG is more like the projection of CM on designated dimension. But that's a bit complex than just refer "CG".
If I understand you correctly, I think you mean absolute CG: front/rear and right/left. That might be best addressed by ensuring that the weight measured under the front left/right wheels are the same. Same for the rear left/right wheels.

I know that this is a rather simplistic method for calculating center of gravity height, but it's the only one I could find.
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Last edited by rmdhawaii; 10-19-2006 at 03:27 PM.
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Old 10-19-2006, 04:59 PM   #6554
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A few more interesting articles about weight:

Weight Transfer

http://www.turnfast.com/tech_handlin...eightxfr.shtml

http://racingarticles.com/article_racing-19.html

http://www.autozine.org/technical_sc...handling_3.htm
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Old 10-19-2006, 07:16 PM   #6555
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man this hobby is becoming a job LOL im just joking
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