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 Chief Maquinna and his brother Callicum performing a theatrical using mock English and mock Spanish words and mimicry of European dress and mannerisms. There evidently was a Jargon in use in the Queen Charlotte, but this "Haida Jargon" is not known to have shared anything in common with Chinook Jargon, or with the Nooktan-Chinookan "proto-jargon" which is its main foundation. Pacific Northwest historians are well acquainted with the Chinook Jargon, in name if not in the ability to understand it. Mentions of and phrases of Chinook Jargon were found in nearly every piece of historical source material before 1900. Chinook