Weight of wheel

[cologne]

Where is the weight of the wheel and unsprung part of suspension and brake?

Before:

Code:

[ wheel-FR ]
mass = 19

[NaN]

It is calculated from tire dimensions. The densities are chosen to match real world tire/rim weight.

Code:

    // calculate wheel inertia/mass
    float tire_radius = tire.GetRadius();
    float tire_width = tire.GetSidewallWidth();
    float tire_thickness = 0.05;
    float tire_density = 8E3;
    
    float rim_radius = tire_radius - tire_width * tire.GetAspectRatio();
    float rim_width = tire_width;
    float rim_thickness = 0.01;
    float rim_density = 3E5;
    
    float tire_volume = tire_width * M_PI * tire_thickness * tire_thickness * (2 * tire_radius  - tire_thickness);
    float rim_volume = rim_width * M_PI * rim_thickness * rim_thickness * (2 * rim_radius - rim_thickness);
    float tire_mass = tire_density * tire_volume;
    float rim_mass = rim_density * rim_volume;
    float tire_inertia = tire_mass * tire_radius * tire_radius;
    float rim_inertia = rim_mass * rim_radius * rim_radius;

[cologne]

It is calculated from tire dimensions. The densities are chosen to match real world tire/rim weight.

I didn´t follow the developers-discussion, but i worried about this result.
Not a good idea because:
- masses an inertia may vary between steel-wheels/normal tyre and cart wheels/slick and rally car or a formula car,
- the result of weight, inertia computation is completely intransparent (can´t add masses in .car-file to totalweight) and
- the unsprung parts of suspension/brakes are unconsidered!

Please allow:

Code:

[wheel-n]
mass = 20
inertia = 0.04

...as optional parameter. Not in 'wheel-n' defined parameter are computed!

[NaN]

Added optional mass, inertia parameter to wheel declaration in rev 2847.

Not a good idea because:
- masses an inertia may vary between steel-wheels/normal tyre and cart wheels/slick and rally car or a formula car,
- the result of weight, inertia computation is completely intransparent (can´t add masses in .car-file to totalweight) and
- the unsprung parts of suspension/brakes are unconsidered!

I'd avoid adjustments of wheel properties to get a certain handling. You would tune for the current implementation. And it has its own load of issues (like low inertia values).

I guess you've got some real-world wheel, unsprung parts mass and inertia values?

[cologne]

Sorry, too slow, to catch Trulli´s rear wheel with unsprung masses in Hockenheim, :-(

I guess you've got some real-world wheel, unsprung parts mass and inertia values?

[NaN]

Try to be faster next time, hehe.