Flywheels - Kinetic Energy

Calculate kinetic energy stored in a rotating flywheel using moment of inertia and angular velocity. A flywheel stores energy mechanically to smooth energy fluctuations in intermittent operating machines.

Flywheel Material	Density (kg/m³)	Design Stress (MPa)	Specific Energy (kWh/kg)
Aluminum alloy	2700	-	-
Birch plywood	700	30	-
Composite carbon fiber - 40% epoxy	1550	750	0.052
E-glass fiber - 40% epoxy	1900	250	0.014
Kevlar fiber - 40% epoxy	1400	1000	0.076
Maraging steel	8000	900	0.024
Titanium Alloy	4500	650	0.031
Super paper	1100	-	-
S-glass fiber/epoxy	1900	350	0.02

Calculator

Inputs

Moment of Inertia (I) (kg m²)

Angular Velocity (ω) (rad/s)

Results

Kinetic Energy (Ef)-- Joules (J)

Calculator

Inputs

Inertial Constant (k)

Mass of Flywheel (m) (kg)

Radius (r) (m)

Results

Moment of Inertia (I)-- kg m²

Calculator

Inputs

Linear Velocity (m/s)

Wheel Radius (m)

Results

Angular Velocity (ω)-- rad/s