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Message: <blockquote data-quote="a33" data-source="post: 1148638" data-attributes="member: 332642">How I understand it, is that flopping occurs when the actuator goes over the rotation axis. So indeed, for instance, when extended (and near the rotation axis), and the dish weight is pulling the actuator over the axis.It can also happen at the retracted side, for instance when the legs of your actuator triangle design are rather unequal in length, and one of the legs is pushed the wrong way.So the actuator triangle fixing points, in relation to the arc width you want to receive, are important.Also notice the text "The bigger C is, the more the risk of flopping is reduced" in this post:[URL unfurl="true"]https://satellites.co.uk/forums/threads/my-channel-master-1-8-project.180003/page-25#post-1128312[/URL]That could help as well!Greetz,A33</blockquote>