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 Point Pacific Northwest. A military reservation was established at Chinook Point in 1864, but was not significantly developed. It was not until 1898, when both the Spanish–American War and heightened tension with Britain over the Alaska boundary dispute prompted formal development. Chinook Point is now part of Fort Columbia State Park, which is in turn part of the Lewis and Clark National and State Historical Parks, a series of parks preserving and commemorating sites related to the Lewis and Clark Expedition. Chinook Point Chinook Point is a headland in Pacific County, Washington. Located just northwest of the mouth of the Columbia