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RVGator
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Date: 3-15-2008
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Number of Hours: 5.25
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Manual Reference: Sec 18
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Brief Description: Cut off elevator tabs and built "riblet"
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I managed to successfully bend the tabs on the Trim Tab, but I have been stewing about the elevator skin. I have decided after much thought not bend the tab on the elevator skin but to make a rib to support the area. I guess I could have tried the bend first to see how it turned out but the “riblet” idea I liked because if the trim tab and elevator had clearance issues I could always cut more elevator away.
I had scrap E-703 end rib, from a previous screw up so I attempted to make a “riblet” out of this. Well when all was said and done I did not like the fit, I was going to need a shim between it and the skin because I made the thing too narrow. I ended up drilling out the end rib from a Van’s training project I had done and made the “riblet” out of this piece. It turned out much nicer and went much faster than the first “riblet”. The difficult part about using the second rib is that it already had holes in it, so I had to measure and make sure the holes in the skin would line up. I going to orient the “riblet” web side out, I figure this will help airflow wise, builder have done both web in or out. So I marked where the holes should go, I used a #41 drill so that if they were off I could just make a new “riblet” without holes and use the #41 holes in the skin as a guide. Well the holes ended up spot on so I will use the “riblet”. The holes in the “riblet” are not great; after all it was a training project, but this will not matter once I drill out to size for the blind rivets.
I plan to use some narrow head Cherry Max rivets (CR3214-4-3) I learned about from another builder, he actually works at www.gen-aircraft-hardware.com . They are expensive but strong from what I hear. You can go to my builder tips section a see a comparison of both the CM and the MK319 rivets. I will have to use the MK319s on the very last hole in the “riblet” because the Cherry rivets set taller, which means they would interfere with the other side. Now on to the trim tab itself.
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Elevator tab cut out at bend line
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First attempt at "riblet"
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The final "riblet" Note smaller gap at trailing edge with this one.
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