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
Birdman Chinook 2008, described the Chinook Plus 2 with the HKS 700E engine: The factory claims that a first time builder can complete the Chinook Plus 2 in 220 hours of labour. The rights to the Chinook Plus 2 were sold to US company, the Aeroplane Manufactory in 2013, which put the design back into production in 2016. The Chinook WT-11 design won Reserve Grand Champion at AirVenture in 1983 and again in 1984. In August 1983 test pilot Dennis Maland flew a WT-11 with the standard Rotax 277 engine to a height of . In November 1984 Jack Hughes flew a