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 Observer Chinook Observer The Chinook Observer is a weekly newspaper serving the Long Beach Peninsula of Washington state. It is named after Chinook, Washington, where the paper was founded in 1900 by George Hibbert and Frank Gaither. Hibbert sold the paper to John and Margaret Durkee in about 1923, who sold it to Bill Clancey in 1933, adding James O'Neil as a co-owner in 1937. O'Neil moved the paper to Long Beach, Washington in 1938. The paper was purchased by Craig and Geri Dennis in 1984, then purchased in 1988 by the East Oregonian Publishing Company, now called the EO Media