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.
1 Turn on the computer. 2  When the initial blue HP screen appears, press the F10 key repeatedly until a recovery menu appears. 3  The progress indicator that first appears does not indicate that a recovery is taking place. 4  The progress indicator represents the time before the recovery process is started.f your HP computer did NOT come with disks, itâs quite possible the HP system recovery files are on a hidden partition on the drive. In this case, you should follow the START menu to restore your PC to factory condition.