les, I gotta say none of my models would work without the master/slave parameter "tricks" I learned from you.  For example, I use a constant delay to open the landing gear doors before the gear starts to move.  Because the rotating linkage in the lowering mechanism is not uniform, I will need intermediate parameters to move them correctly.  There probably is a mathematical relationship between them, but I will be using your try-and-check method to find the values.

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