Flywheel Inertia

[trevor.summerfield]

Hey I took this right off the yamaha site, its a flywheel with extra weight right into the flywheel. I saw this at the bottom and wanted to know something.

"""""*NOTE: Flywheels are measured by inertia weights because the affect of the weight differs depending on where it is in relation to the center of the crank. So a 4 oz. and 6 oz. weight might have the same affect depending on where they are positioned in relation to the center of the crank."""

"""""Adds 1.5 oz. for an inertia mass of 4.5 kg-cm² (stock inertia mass=4.0 kg-cm²) """"

So the question is, would anybody know what the inertia mass of lets say a 9 oz flywheel weight be? because it might be more or less than one would think because of the placement. So actually wouldnt this make a 9oz weight from one company be different than a 9oz weight from another, because they might place more of that 9oz's away from the center.

and another way to look at this might be holding a 9oz weight on a short string and spinning around in circles, and comparing that to spinning the same speed with the 9oz weight on a very long string, the affect would be very different.
So with that in mind wouldnt a 9oz weight with the weight centered around close to the crank be the same as a 4oz weight centered further away?
What do you guys think about this?

Trevor

 

[Red Ryder]

You got er right, that makes complete sence. That would have never crossed my mind.

 

[mmz77]

^^ Physics Teacher ^^??? :)

 

[trevor.summerfield]

And this would also make sense to have a different way to advertise the companies flywheel weights, for instance instead of saying 9 oz weight, say adds "x amount kg-cm inertia mass."

Trevor

 

[Red Ryder]

That could be a good money maker. ;)