For making your own flywheel steel should do fine. You're probably not aiming for an 80,000+RPM flywheel that rides on magnetic bearings. So composites shouldn't be needed. The best material, eventually, for flywheels should be carbon nanotubes. They have huge tensional strength, but lousy compression strength. Tensile loads is what a flywheel has, so they'd work great.
It is important to note that not all batteries associated with these computer models are affected. The company is directing all users to its HP Battery Recall website to go through the online validation and replacement process.
Reliable memory for HP Desktop and Notebook computer. Memory Upgrades. Memory is an important component of your computer, and selecting and managing it properly is vital to keeping your system up and running at peak efficiency. If your computer is an older model or if it lags or freezes, you may not have enough memory.