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cyclic and collective mechanics


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Hi everyone.

 

I've been trying to research the mechanics behind the cyclic and collective movements. I understand what each one does (the cyclic changes the tilt of the swashplate and the collective raises or lowers the swashplate as a whole). What I'm trying to find out is how are the pushrods connected and what, (and where) are they connected to, so that they don't interfere with each other? If someone has a diagram that would be very helpful.

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Hi everyone.

 

I've been trying to research the mechanics behind the cyclic and collective movements. I understand what each one does (the cyclic changes the tilt of the swashplate and the collective raises or lowers the swashplate as a whole). What I'm trying to find out is how are the pushrods connected and what, (and where) are they connected to, so that they don't interfere with each other? If someone has a diagram that would be very helpful.

MD_Rotor Control.pdf

AS350 B2 Rotor Controls.pdf

Edited by iChris
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  • 4 weeks later...

Hi everyone.

 

I've been trying to research the mechanics behind the cyclic and collective movements. I understand what each one does (the cyclic changes the tilt of the swashplate and the collective raises or lowers the swashplate as a whole). What I'm trying to find out is how are the pushrods connected and what, (and where) are they connected to, so that they don't interfere with each other? If someone has a diagram that would be very helpful.

 

I am no collective or cyclic mechanic and I don't know if this is going to help you or not but I recently taught this preparing for my CFI ride. All of the control inputs you make on the collective and cyclic move the Mixer bell crank. The mixer bell crank has the control rods connected to it on the bottom end of the control rod and the top of the control rod is connected to the stationary swashplate. The control rods only move up and down and like you said tilt the stationary swashplate. There are bearings in a channel in between the stationary and rotating swashplates that let the stationary control the rotating will remaining stationary. The collective moves the mixer bell crank up and down changing the pitch of the blades collectively hence the name collective. When you make these control inputs you move the rotating swashplate that has pitch links on it which are connected to your pitch horn which allows your feathering hinge to turn therefor changing the pitch of the blades. I really hope this doesn't confuse you more haha.

 

IMG_5784

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