Talk:Helicopter flight controls

CH-47

"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 differential collective pitch"

This doesn't sound correct to me, or its out of place in the article. It's a collective, it adjusts the collective pitch on both rotors so the helicopter climbs or descends like any other helicopter, only they call it a different name. The differential collective for the fore and aft rotors are what they use in place of the cyclic control, by causing the collective pitch of one rotor to change, creating a differential in lift. This section is talking about the collective and what it does. The thrust control is equivalent to the cyclic on a single rotor machine, the only relationship it has to the collective is that it mechanically functions the same way as a typical collective does on a rotor. Putting this here and phrasing it this way makes it sound like a CH-47 doesn't have a collective control, it has a "thrust lever" that changes the pitch of one rotor. It absolutely has a collective, and it's probably still called a collective. It needs a way to climb vertically by changing both rotors equally, as well as a way to adjust pitch by changing them individually. They call it a thrust lever and not a cyclic because it doesn't work like a cyclic. The collective is still just a collective, only it works on all the blades on two rotors. Or at best you could say it has two independent collective systems, one that only works on one rotor to change pitch, one that works on both rotors to change total lift. But it doesn't "have a thrust lever instead of a collective lever". Idumea47b (talk) 07:06, 2 September 2024 (UTC)