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 Jargon a hundred years old, like Henry Broderick, the realtor, and Joshua Green, the banker." Jones estimates that in pioneer times in the 1860s there were about 100,000 speakers of Chinook Jargon. Most books written in English still use the term Chinook Jargon, but some linguists working with the preservation of a creolized form of the language used in Grand Ronde, Oregon prefer the term "Chinuk Wawa" (with the spelling 'Chinuk' instead of 'Chinook'). Historical speakers did not use the name "Chinook Wawa", however, but rather ""the Wawa"" or ""Lelang"" (from Fr. "la langue", the language, or tongue). NB "Wawa" also