Helicopter rotor of gravity fore-aft. However, it requires the expense of two large rotors rather than the more common one large main rotor and a much smaller tail rotor. The Boeing CH-47 Chinook is the most common tandem rotor helicopter. Coaxial rotors are a pair of rotors mounted one above the other on the same shaft and turning in opposite directions. The advantage of the coaxial rotor is that, in forward flight, the lift provided by the advancing halves of each rotor compensates for the retreating half of the other, eliminating one of the key effects of dissymmetry of lift: retreating blade
Chinook Sciences its focus on becoming a technology and equipment provider to metal, industries gasses and environmental industries. In October 2008 Chinook Sciences announced the formation of Chinook Energy. A division that would exclusively handle their waste to energy technology application. In March 2009 Chinook Sciences and European Metal Recycling (EMR) announced a joint venture named Innovative Environmental Solutions UK LTD. (IES), which they would claim is the “first commercial scale enterprise to generate renewable electricity and recycle metal from automobile shredder residue” (ASR). The proposed venture would process 120,000 metric tons of automobile shredder residue per year using Chinook's patented and