- Oct 18, 2003
- Saline Michigan
Good to hear that the pushrods are OK. I keep thinking of Marc's observations on Long-EZ back seat elevator control and how easily Peter seemed to get the second half of his stick deflection on his gauged pull.While some of the pushrods are way too small, they're short and none of the ones in the cockpit or wing are buckling, elastically or otherwise.
So some of the belcranks in the plane (for the door locking, and some of the controls) are too small, leading to any play in the rod-ends or bearings being magnified in the total play from stick to control surface. Some also have some to much flexibility in their mounting, adding to play. Pushrods aren't the issue.
The single shear nature of many of the mounting points, or the flexibility of the underlying substrate, is a large majority of the issue with compliance in the roll control system. PItch has its own issues, but yaw actually works pretty nicely.
Also good to hear that the underlying sources of the flexibility have been identified. Single shear connections mean torsional deflection of the associated pieces. Lots of room for improvement in those elements by simple redesign where they are significant contributors. I hope that he starts with the largest contributors and works his way toward smaller ones.