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Multiple Servo Linkage Geometry

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Multiple Servo Linkage Geometry

Old 07-02-2021, 02:16 PM
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Going Balistic
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Default Multiple Servo Linkage Geometry

Has anyone ever seen or setup linkages like this before? This comes from an extremely well built plane that I purchased a number of years ago and just now getting around to prepping to fly.

The interesting thing is that this plane has a removable tail section and the push rod drives another linkage in the tail that actuates the two externally mounted push rods that are connected to the elevators.

Not sure on the reliability, etc.

The workmanship is impeccable, but a little concerned with all the mechanical aspects and the geometry of the two servos. There is a cap screw on the end of the shaft that will prevent the shaft from coming out of the linkage.

Any feedback / experience would be appreciated.

Old 07-03-2021, 03:42 AM
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scale only 4 me
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Wow,, What kind and how old is the plane? I mean those servos are so obsolete today, having to couple 2 70oz servos makes no sense to me,,

Question,, does the center link slide on that rod?

Based on what you say about the extra linkage in the tail doesn't this result in a lot of play in the elevator(s)
Old 07-03-2021, 03:50 AM
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That linkage is called a "walking beam" and I have seen it discussed at length several years ago. I've not implemented it myself. It is a method of providing control if one servo dies, but only half the travel. It does provide the torque from both servos when they are working.
Chuck

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