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 February 3, 2021

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Rudder Stops

I wanted to get the rudder angles just right so I used plumb bobs to transfer the motion to the floor where I layed out all the angles. The manual says to set the rudder travel between 30 and 35 degrees. I put the rudder on before I found the center of rotation and had to go back to high school gemoetry to find the center of the circle. (You do remember that two lines perpendicular to the center of different chord lines will intersect in the center of the circle don't you? :-).

Anyway it would be better to find the center of rotation before mounting the rudder by dropping a plumb from the hinge center. Then lay out the angles on the floor, drop a plumb from the trailing edge of the rudder and build the stops.

I also discovered (without messing up any parts for once) that the rudder stops as drawn in the plans would not work. I just made the stops without cutting the angles on the top and clecoed them to the fuselage after drilling the holes. Then I trimmed each one until I had the right travel on the rudder.

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 February 3, 2021