Usually when we think of multicopter drones, we picture aircraft with four or more rotors. The V40 agricultural drone takes a different approach, using two tilting two rotors in an effort to improve ...

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For decades, single-piece rotors have been the mainstay of light- and medium-duty truck brakes. Now, two-piece rotors — first developed for NASCAR and other car racing sports — are slowly making their ...

More power in a smaller package for less money is the promise for an unusual type of wind turbine with two rotors arranged in tandem. Easier component transport, handling and assembly are benefits on ...

Managing Editor Josh Goldman is a laptop expert and has been writing about and reviewing them since built-in Wi-Fi was an optional feature. He also covers almost anything connected to a PC, including ...

In its standard form, the Mazda 13B Rotary engine has two rotors that make a distinct 'brap-brap' while at idle, and a 9,000 RPM scream on full tilt. It's a two-stroke dream of an engine with a cult ...