1 - 18 of 18 Posts

Joined

·
11,891 Posts

They built the trailer to balance the smart, so they should know where it is.

Joined

·
48 Posts

Go to a truck stop and get the axle weights. Then ask Mark (DIYGuy) or Henry (hjsdds) for the formula to calculate it. I think I know what the formula is, but I can't remember it for sure and don't want to give you bad info. (It's at home and I'm not) I know they know it. I'm watching your turntable project with interest, as I may do the same thing.

Steve

'09 smart on a Volvo 660

Steve,

Go to a truck stop and get the axle weights. Then ask Mark (DIYGuy) or Henry (hjsdds) for the formula to calculate it. I think I know what the formula is, but I can't remember it for sure and don't want to give you bad info. (It's at home and I'm not) I know they know it. I'm watching your turntable project with interest, as I may do the same thing.

Steve

'09 smart on a Volvo 660

Thanks. As soon as I get CG I can have welder begin project. I cannot believe that Daimler does not readily have this info.

Will keep posting details as project proceeds on HDT forum.

Joined

·
9,491 Posts

And surrounding posts... :wink:Well, I've done it. I finally did a Center of Balance. Now last time I weighed my car it chimed in at 80 pounds less! This time thegross weight is 1840. Now myfront axle weightwas760and therear axle weightwas1080.

After I did the math theC/Bwas58 inches.For those who need the center of balance for whatever reason, putting a Smart on a trailer etc. 58 inches is just a hair behind the end of the grab handle/door pull in the interior.

Disclaimer:Your center of balance calculations may vary, but I bet they're pretty close to this one.

...

Joined

·
11,307 Posts

-----------------------

**GVW**

**Key:**

D1= Distance from the front of the car to the center of the front axle

D2=**Distance from the front of the car to the center of the rear axle**

W1= Weight of the front axle

W2= Weight of the rear axle

GVW = Gross Vehicle Weight

CB= Center of Balance

This was one of the first things I did when I got my car, figure out the CB. I'm weird that way. I teach a class about once or twice a week where I have to explain the CB formula. That explains my enthusiasm.

D1= Distance from the front of the car to the center of the front axle

D2=

W1= Weight of the front axle

W2= Weight of the rear axle

GVW = Gross Vehicle Weight

CB= Center of Balance

This was one of the first things I did when I got my car, figure out the CB. I'm weird that way. I teach a class about once or twice a week where I have to explain the CB formula. That explains my enthusiasm.

The method of locating the longitudinal center of gravity is easy if you know the weights bearing on the front wheels, and the weights bearing on the rear wheels. The LCG is found by a mensuration of “moments” – the products of weights and distances from a common point.

A workable common point could be 1” ahead the front axle (you can’t use the front axle itself because a real distance must be involved). The smart’s wheelbase is 73.5”, so the front axle is 1" behind the common point, while the rear is 74.5" behind. The curb weight of a smart coupe is 1808 lbs.

Just for argument, let us say that the smart has a 45/55 front-to-rear weight distribution, thus there is 813.6 lbs on the front and 994.4 lbs on the rear. Proceed thusly:

Front moment = 813.6# x 1” = 813.6

Rear moment = 994.4# x 74.5” = 74,082.8

Add the moments – 813.6 + 74,082.8 = 74,896.4

Divide that sum by the total curb weight – 74,896.4/1808# = 41.425

The LCG is located at 41.425” behind the common point, or, 40.425” behind the front axle.

Joined

·
9,491 Posts

I vaguely remember someone posting about the weight distribution by wheel, vs. by axle, but I cannot find it. And it said that each wheel showed a different number.

Joined

·
9,491 Posts

The scales I used are a track set that sat on the shop floor and could be off on the total a bit we did level and zero would bet the relationships are good.

LF 390 RF 404

LR 529 RR 525

1848 lbs. wet without driver, I can see an 88 lbs difference with all the options. There have to be others that have access to scales...

you can clearly see how she carries her weight

karl

I vaguely remember someone posting about the weight distribution by wheel, vs. by axle, but I cannot find it. And it said that each wheel showed a different number.

Thanks to all for your help. Seems like the techies can get ansers faster than the mfg. Many thanks. Watch Escapees HDT forum for more on my long Smart loader for legal carry.

Thanks again.

Joined

·
75 Posts

Hi Steve,Skiptamm

Go to a truck stop and get the axle weights.

Steve

'09 smart on a Volvo 660

FWIW= Found out you can't weigh the Smart at the CAT Scales by itself. CAT Scales require a minimum of 2000lbs to activate the scale.

I know this for fact as when I went to weigh mine

this info came out. Had to get a buddy to put his truck on the scale and make two weighs and subtract the difference for the Smarts weight.

Actual weight of the Smart w/full tank of fuel was 1880lbs, note mine is a Cabrio.

This is how we carry our's.

Later

Rich :smartje:

Joined

·
277 Posts

It was my understanding that there was a single CG that has an x, y, and z component... I spent about 30 minutes 15 years ago explaining how a bit bucket had no impact on the cg of a shelter I was designing a computer system for

Well, yes there is, but it is really only useful for a static object - then it is Center of Mass. When you think of dynamic forces on a smart that make it yaw, pitch or heel, the xyz components have to be considered separately.It was my understanding that there was a single CG that has an x, y, and z component... I spent about 30 minutes 15 years ago explaining how a bit bucket had no impact on the cg of a shelter I was designing a computer system for

Joined

·
7 Posts

I have a 2015 Pure and only place I found a curb weight figure was Wikipedia, which says the 451 Coupe is 750–795 kg (1,653–1,753 lb)

1 - 18 of 18 Posts

Join the discussion

Smart Car of America Forum

A forum community dedicated to all Smart Car owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, economy, maintenance, and more!

Full Forum Listing
Recommended Communities

Join now to ask and comment!