This is model of a lightened flywheel, tested within Solidworks FEA at 500Nm of torque. This design passes both stress and frequency tests.
Modelled within Solidworks 2015, updated and rendered within Solidworks 2016. Up to 4173 polygons and 6211 vertices. Solidworks material is Gray Cast Iron. Renders include PhotoView 360 and RealView Graphics at 4K.
Feel free to use this model how you desire. Suitable for 3D renderings for visualizations, vehicle simulation, real-time scenes, CAD/FEA work, etc.