[Grampawinger]

Can someone tell the C/G from the front axle for a 06' GL1800?
Thanks
Dusty Roads

It is within a few inches of the support steel for the center stand.



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[Grampawinger]

How was that determined?

By the ease with which one can lift the front tire off the ground while the bike is on the center stand.



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[Grampawinger]

You are confusing center of gravity with the front to rear balancing point, two different animals.

Perhaps you are confusing center of mass with center of gravity.

I will admit that I was describing the approximate location of the balance point since the originator asked for the distance from the front axle.



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[Grampawinger]

Those two points are indistinguishable from one another in any body that is small relative to the size of the Earth.

The two terms are sometimes used interchangeably, but I believe that Dusty wanted to know the distance, from the front axle, to the balance point which is dependent upon the loading on either side of the balance point.

The vertical distance is also important when considering Centrifugal force and how it affects cornering. I.E. a Goldwing has a "low center of gravity" which is helpful when overturning is resisted.

Why are we making this such a big deal?:joke:


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[Grampawinger]

The center of gravity of an object involves a 3 axis visualization. Calculations would involve the X axis, Y axis, and the Z axis.

Visualize the Wing on three skewers, one from end to end through the tires and another from side to side and another through the bottom extending upward somewhere near the back of the seat. The point at which the three skewers intersect and the bike is in balance for each one is the center of gravity.

Center of Mass:

the point in a body or system of bodies at which the whole mass may be considered as concentrated. Our Milkey Way Galaxy has a center of mass.

Center of Gravity:

the point at which the entire weight of a body may be considered as concentrated so that if supported at this point the body would remain in equilibrium in any position.


Class dismissed:joke:


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[Grampawinger]

opcorn:



:coffee1:






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[Grampawinger]

OK,so no one knows the actual measurement.
I don't have my bike with me to measure using the center stand,so that's why I need the actual inches.
Thanks all for the advice.
Does anyone have Motorcycle Consumer News issue with the Goldwing review?They usually publish the C/G
Thanks

Here is a link to the March, 2010 issue comparing the Gl1800 to the Beemer.


http://www.mcnews.com/mcn/model_eval/200410-GLvsLT.pdf


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[Grampawinger]

Bamboo. Metal skewers sometimes leave an unpleasant taste.

Soak the bamboo overnight to prevent charring.


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[Grampawinger]

Interesting thread. Again, I don't think the OP is looking for the CG, but rather the "balance point" of the motorcycle in the horizontal (-X-) axis <only>. He could certainly determine that by using the scale method explained earlier. That will indeed give him the balance point along the wheelbase, but that is not the location of the CG. Why? Because that procedure will not locate the CG locations in the other axis, such as distance above axle (-Y-) or side to side (-Z-) location. The CG is the point at which ALL the mass of an object is balanced, not just balanced front to rear or in a single plane.

Example: A block 50 x 20 x 10 of uniform mass has a CG located at point
25,10,5 in the X, Y, and Z planes


Soo, he ends up without the CG location (but he doesn't need it) but does have a measurement that he can work with and probably suits his purposes. :thumbup:

You are correct about the xyz axis location for the centroid location. But He is adament of knowing the factory cg location probably for calculation purposes for the trailer he is building. Wish I could help him find the data.

Once known someone may empty the gas tank and have 50 lbs of cargo in the trunk and saddlebags. WALAAA the cg shifts.

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