Flywheel Inertia Calculator
SI
Imp
Imperial
Inputs
View results
Flywheel shape
Solid disk
Annular disk
Flywheel mass
(m)
Flywheel or rotating part mass.
lb
Outer radius
(r_o)
Outer radius of the rotating disk.
in
Inner radius
(r_i)
Inner radius for an annular disk.
in
Engine speed
(n)
Flywheel rotational speed.
rpm
Overall ratio
(G)
Gear ratio from flywheel to tire in the selected gear.
Tire rolling radius
(r_t)
Rolling radius at the driven tire.
in
Results
Default result
Edit inputs
Moment of inertia
(I)
0.0784
kg*m^2
Pass
Also computed
Stored energy
(E)
13,400
ft·lbf
Rim speed
213.2
mph
Equivalent vehicle mass
Pass
228.6
lb
Method notes
2 notes
The geometry model treats the flywheel as a uniform solid or annular disk. Real flywheels concentrate mass unevenly.
Equivalent vehicle mass is reflected through the selected overall ratio and tire radius, so it changes by gear.
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