I had a new battery installed in my 2000 Volvo S70 a couple of months ago. The car sat for a couple of weeks, and now the battery appears to be dead.

Brake rotors are one of the most integral parts of a modern vehicle. Without them, you’re hitting a tree, a mail carrier, or Timmy’s dog Spot. Too often do we overlook brake rotor wear, only ...

Rotors: In A Nutshell. Brake rotors in cars are circular metal discs connected to the wheels. There are four brake rotors installed in cars, one for each wheel. The rotors’ primary purpose is to slow ...

Drilled rotors have holes drilled into them and look to provide improved brake cooling, similar to slotted rotors. They also allow water to escape the brake’s surface better, ...

Though uncommon, squirrel-cage rotors can fail. Here are tips on how to find the problem, fix the rotor, and get the motor running again.

Brake rotors should be 8 to 30 mm thick, or whatever your vehicle manufacturer recommends. Measure them with a brake rotor gauge or micrometer measuring tool.

The rotor sail was invented by German engineer Anton Flettner. It is effectively a large, spinning metal cylinder that uses something called the Magnus effect to harness wind power and propel a ship.

The ram-rotor detonation engine: an unprecedented design promising class-leading efficiency from zero all the way to Mach 5 hypersonic speeds and beyond ...

Close, but not quite, since the rotor blades are fixed-pitch. We’ll just go with “monocopter” for now and sort out the details later for this ducted-fan, thrust-vectored UAV .