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
Billy Chinook He was one of three elected Chiefs of the Wasco Nation, representing the Dalles Wasco. He was a signatory to the treaty that established the Warm Springs Reservation. Chinook lost his land claim at Mill Creek in 1856 and removed to the Warm Springs Reservation. Chinook enlisted as Acting First Sergeant in Captain John Darragh's Company of 50 U.S. Army Indian Scouts in 1866 for a term of 1 year during the Snake War. First Sergeant Chinook participated in the first battle of the war in present-day Crook County, Oregon. In 1866 Chief Paulina, his half-brother Chief Wahveveh and a