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A shaftless flywheel eliminates the annulus holes, shaft or hub. It has higher energy density than conventional design[10] but requires a specialized magnetic bearing and control system.[11] The specific energy of a flywheel is determined by{textstyle {frac {E}{M}}=K{frac {sigma }{rho }}}{textstyle {frac {E}{M}}=K{frac {sigma }{rho }}}, in which {displaystyle K}K is the shape factor, {displaystyle sigma }sigma the material's tensile strength and {displaystyle rho }rho the density.[citation needed] While a typical flywheel has a shape factor of 0.3, the shaftless flywheel has a shape factor close to 0.6, out of a theoretical limit of about 1.[12]

Foshan CKS Truck Parts Co., Ltd. is a professional manufacutrer and exporter offers quality truck spare parts like air brake compressors, air brake system parts, truck engine parts, truck chasis parts, truck clutch parts and truck body parts for Hino, Isuzu, Mitsubishi Fuso, Nissan UD and othe major truck brands. 

Found in 1989, CKS Truck Parts has been in the truck parts business for over 30 years. From 2010, we started our oversea business. And for now, we have provided services for over 1000 customers coming from 15 different countries all over the world. We bases our truck parts business on customer's trust, customer's satifiaction and also the best product quality. That is why we can keep a very good business realtionship with all these customers from all over the world.

CKS Truck Parts located at Foshan, Guangdong, which it's right next to Guangzhou City. With a very conveninent location, we can access to airport, port and all shipping agent's warehouse easily. This can make sure we are able to ship out your products in the shortest time.