Helicopter flight controls blades collectively ("i.e.," all at the same time) and independent of their position. Therefore, if a collective input is made, all the blades change equally, and as a result, the helicopter increases or decreases its total lift derived from the rotor. In level flight this would cause a climb or descent, while with the helicopter pitched forward an increase in total lift would produce an acceleration together with a given amount of ascent. The collective pitch control in a Boeing CH-47 Chinook is called a "thrust control", but serves the same purpose, except that it controls two rotor systems, applying
Chinook Point was designated a National Historic Landmark in 1961. Chinook Point is a hilly promontory on the north bank of the Columbia River, roughly east of its actual mouth, which is marked on the north by Cape Disappointment and the south by Point Adams. The point is fortified with the remains of Fort Columbia, which include thirteen buildings erected in 1902, and three artillery emplacements installed between 1897 and 1900. The mouth of the Columbia River, the major river of the northwestern United States, was almost discovered several times before Captain Robert Gray spotted it in 1792. Spanish explorer Bruno de