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Old 10-22-2013, 06:40 PM   #1
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Default chassis weight placement

I know what moment of inertia is...kinda...
Conclusive of mass,speed time...
I'm wandering,mostly blind here so correct me as needed...
My issue is that I'm using a shorty 2s in a tc6.1...
The difference ,in weight,between my shorties and full size batteries,run between 100 and 150 grams...
I'm using that weight margins to counter the weight of my motor...
Currently I have 112 grams in the car,set fairly close to the centerline...
The ballance is good,car handles nicely...
I can move the ballast outboard,reduce the weight and still ballance the motor...
I know that the further out I place the weight,the slower the car will react to input from steering and suspension movement due to the track...
My question is...
Does keeping the weight(112)inboard pay better dividends with more weight...?
Or is it better to move a lighter weight(56) out away from the centerline...?
Thanks...kirt
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Old 10-22-2013, 07:24 PM   #2
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It probably depends on the motor class.

If I was running a slow class like 21.5, I'd want less weight for more straight line speed. If it was Mod then I might go the other way.
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Old 10-22-2013, 07:26 PM   #3
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Quote:
Originally Posted by brwn bggr View Post
I know what moment of inertia is...kinda...
Conclusive of mass,speed time...
I'm wandering,mostly blind here so correct me as needed...
My issue is that I'm using a shorty 2s in a tc6.1...
The difference ,in weight,between my shorties and full size batteries,run between 100 and 150 grams...
I'm using that weight margins to counter the weight of my motor...
Currently I have 112 grams in the car,set fairly close to the centerline...
The ballance is good,car handles nicely...
I can move the ballast outboard,reduce the weight and still ballance the motor...
I know that the further out I place the weight,the slower the car will react to input from steering and suspension movement due to the track...
My question is...
Does keeping the weight(112)inboard pay better dividends with more weight...?
Or is it better to move a lighter weight(56) out away from the centerline...?
Thanks...kirt
How far out the weight is left to right isn't nearly as important as how far out it is front to rear. So if the weight is near the middle of the car, but away from centerline, it's probably better than having more weight but closer to the centerline. Also, moment of inertia comes into play mostly during turn-in and transitions. When you're accellerating, braking, and under constant yaw rate, overall weight is what determines how much load you're putting on the motor and the tires, and less is usually better.

-Mike
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Old 10-22-2013, 08:58 PM   #4
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Talking

Very good information gentlemen...
Thank you kindly...
...kirt
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