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Sid & Houston Mayeux Project
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Date: 2-19-2013
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Number of Hours: 3.00
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Manual Reference: Arm rests
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Brief Description: Reinforcing the cockpit arm rests, part 1
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The RV-7's cockpit wall ribs are intended for use as arm rests by the pilot and copilot. However, they're just really flimsy. They're not intended to hold a person's weight or for use to prop yourself up in the chair. Most builders do nothing to these armrests, but I want a little more strength. Many builders do reinforce these arm rests and often use 3/4" x .063 angle, but that seems a little like overkill. I found a solution.
Early in the build, I screwed up my HS-702 horizontal stabilizer forwar spar: I threw them in the scrap bin, ordered two new ones and moved on. Now, one of those spars worked perfectly for this job. It's 0.032", which is not too thick but basically doubles the thickness of the existing arm rest ribs. Also each side of the HS-702 spar has a 90 degree flange with a bend radius identical to the arm rest ribs' flange bends. Image 1 shows where trimmed off the outer 3/4" of each side, making a 3/4" x 3/4" angle.
Also, HS-702's side flanges come pre-drilled with perfectly spaced holes for rivets. Image 3 shows me match-drilling to #40 from behind through those pre-drilled holes.
Drill, debur, dimple for AN426-AD3 flush rivets, then prime...
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Creating angles from scrap
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Fitting the angles to the arm rests
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Match-drilling through the angle rivet holes
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