Formulas?

[A//// Guy]

Anybody know the kind of formula for rotational weight. For wheels. brakes, drivetrain etc....

Like if you make 365HP to the wheels with 25LB rims... what will you make with 15LB rims... etc

I have no clue... Raptor- You know this stuff?

[1ViciousGSX]

It all has to do with this, ASK RAPTOR :P


It has to do with where the weight is placed in the design of the wheel (more weight at the center or hub of the wheel, or more to the outside of the wheel), the diameter of the wheel, the weight and diameter of the rotor, etc. Inertia, accelerating forces applied to the wheel and kenetic energy all play a factor. That's a tough answer to put together when you look at all the variables. It would be better to try different wheels or rotors while noting their weight properties and designs and make some data sheets to compile the effects between different designs.

When all else fails, ASK RAPTOR :lol:

[jd1828]

I = 1/2m r^2 that is the equation to find inertia of a solid sphere. which is close enough to a rim

[1ViciousGSX]

Originally posted by jd1828@Oct 28 2003, 05:00 PM
I = 1/2m r^2  that is the equation to find inertia of a solid sphere.  which is close enough to a rim
What ever dude :razz2: (in my best brain dead surfer dude voice)
:lol: :lol: :lol: :lol: :lol:

[Jakey]

Originally posted by jd1828@Oct 28 2003, 04:00 PM
I = 1/2m r^2 that is the equation to find inertia of a solid sphere. which is close enough to a rim
Ummm, moment of inertia of a solid sphere is (2mR^2)/5.
Moment of inertia for a solid cylinder is (mR^2)/2 which is what a rim + tire could be respectively considered.

[jd1828]

Originally posted by Jakey@Oct 28 2003, 04:10 PM

Ummm, moment of inertia of a solid sphere is (2mR^2)/5.
Moment of inertia for a solid cylinder is (mR^2)/2 which is what a rim + tire could be respectively considered.
i ment cylinder not sphere

[Super Bleeder!!]

so how many dooods on here have had to take physics/calc?

[A//// Guy]

Ive taken physics in High school.. forgot all the formulas... Math sucks so Ill never see calc in my lifetime... GO Math for Liberal Arts!

Well about the formulas... I dont know how to apply that to HP or anything... I know that 100lbs is roughly .10 off 1/4... but what about rotational lbs.... It has to affect WAY more than non rotational lbs.

[CVD]

I think the most basic/simplified/non-mathamatical way to figure it is:

-10lbs = +1hp
Multiply by 4 for rotational weight.

[Jakey]

Originally posted by gixxer@Oct 28 2003, 09:28 PM
so how many dooods on here have had to take physics/calc?
I'm in my first of two physics classes right now. I had two semesters of calc last year and have to take differential equations this spring.