Mark Johnson - Experimental Aircraft Builder's Log

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Date: 8-16-2021
Number of Hours: 3.00
Manual Reference: 8-7
Brief Description: Horizontal Stabilator Ribs (8-7)

I had to wait on a couple screws to complete the rudder counterweight assembly, so I stated bac on the HS ribs. A few of the ribs needed to be bent to account for the angle of the skin. The KAI says to just bend by hand, but it’s difficult to get a nice bend with the lightening hole. To get a decent ben I ended up clamping the rib to the workbench with some wood pieces and using those to help define where the crease will be. I took a couple iterations, but I ended up getting it to the right angle. The rest of the time was spend deburring all the edges on all the ribs. I also assemble the skeleton together multiple times to match drill all the holes where the ribs connect to the spar. Now ready for the skin as soon as I can clear the rudder off the workbench.

Rib clamped down to bend flange (21-091)

Bending flange for inner ribs on HS (21-092)

Flange now at the 9 deg angle (21-093)

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