Rotating mass
 

Back when I was drag racing snowmobiles a lot of the more successful racers obsessed about reducing rotating mass.

From what I have read here that unlike the garden guys the pulling crowd tends to not use wheel weights or load their tires. I get it. Less rotating mass equals greater wheel speed.

Sitting here swirling the ice in a tumbler of White Label got me thinking. (yes, it hurts sometimes) Are fluid filled tires really considered rotating mass?

Yes. Even if it's fluid movement, there's still drag/friction. As well as unsprung weight. Can't imagine about the fluid sloshing in the tires.

Think about the concept of determining if an egg is hard boiled or raw. :biggrin2:

I have to agree. takes energy to get it moving. then it will slosh around to , not something you would want. its not moveable either

Thanks gentlemen. Both very good points.
If I wasn't getting sloshed myself I might have figured it out on my own. :biggrin2:

I will also point out that tractors with loaded tires are harder to stop, if your brakes don't work that good with empty tires you might not be able to stop at all once there loaded.

Tractor pulling and "work" pulling are two completely different things. With tractor pulling you don't want to waste HP trying to getc the weight rolling, and wheel speed is important. Plus, like Don pointed out, the weight isn't movable.
When doing tillage work at slow speeds, we don't care what it takes to get it rolling.... it's not a race. You need the weight directly on the tire because your trying to gain traction. Bouncing around in a field/garden, you want as much weight on the wheel itself so the axle bearings don't have to absorb the abuse.

Very, very different applications.

Drinking and not thinking. Forgetting my basic physics.

Newtons first law...
An object at rest will remain at rest. An object in motion continues in motion.
Newton's second law...
Acceleration is produced when a force acts on a mass. The greater the mass the greater the amount of force needed.
Newton's third law...
For every action there is an equal and opposite re-action.

Simple machines... It's amazing the things we do every day but forget the science behind it all.

I think I need another drink.