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 interact with the First Nations people living there. The old settler families' heirs in the Pacific Northwest sent communiques to each other, stylishly composed entirely in "the Chinook". Many residents of the British Columbia city of Vancouver spoke Chinook Jargon as their first language, even using it at home in preference to English. Among the first Europeans to use Chinook Jargon were traders, trappers, Voyageurs, Coureurs des bois and Catholic missionaries. Hawaiians and American in the region made much use of it as well. In some places Kanakas married into the First Nations and non-native families and their particular mode