mpgxsvcd
Active Member
I looked at the spreadsheet but I am not so sure I agree with all of the data that was entered or even with how the calculations are done. First what does "mass of wheelset 1" represent. Is that the mass of one wheel? Mass of all of the wheels combined? Mass of one wheel and tire combination?44lbs of rotational weight is not equal to 90lbs of static weight, its about equivalent to ~51lbs, depending on various variables.
You can play with the math on the 2nd tab on this spreadsheet:
Vehicle Energy Maths
Highway Range From Wheel/Tire Changes Original Car Mass (lbs),4200 Battery Capacity (kWh),82 Cruising Speed (mph),70 Cd,0.23 Frontal Area,2.22 Starting Wheel/Tire Package,Modified Wheel Tire Package Wheel/Tire Weight (lbs),100,80 Tire CRR in (kg/t),7,7 Range (miles),301.7286608,302.2162577 Vehic...docs.google.com
I am actually moving from heavier tires to lighter ones as well. Since all of the tire is beyond the wheel's outermost diameter those tire differences should be factored in as well.