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Jim's Web Site
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Date: 7-17-2012
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Number of Hours: 1.50
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Manual Reference:
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Brief Description:
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While I'm letting the elevators cure for a few days, my attention can return to the rudder. Yesterday the lower rudder hinge/control horn combination came from Lancair. So today I began to see where it would fit and how. That's when the fun began.
The plans call for the rudder spar to be adjusted to the exact height of the ribs as drawn on the plans. When I made the first spar, I did just that. When today I placed the lower hinge at its location on the spar, it overlapped the spar at least 1/8 inch on each side. The manual for the internal rudder contemplates that, to a degree, and advises trimming the sides of the hinge to match the spar. Problem is that to fit the spar I made to fit the ribs, the required trimming would require removing parts of the working surfaces of the piece, not just the mounting face.
That prompted me to check the fit of the spar. I taped it into place in the right half of the rudder skin, then placed clay on top of the spar and fit the left skin in place. Removing the left skin revealed about 1/4 inch gap between the spar and the skin. Enlarging the spar this much would allow the skin to fit and would allow fitting the rudder hinge piece to fit with little trimming. Of course that would make the ribs not high enough. So if I keep the spar larger, I'll have to increase the rib dimensions, contrary to the note on the plans. So what's right?
Image below shows the hinge placed on my second rough spar.
I think my next task is to try to come up with a dimension on the trailing edge of the vertical stabilizer, to see if the extra thickness of the rudder will still fit.
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Lower rudder hinge on rough spar
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