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Without seeing a pic of how elongated the hole is, it is a bit hard to say. Having said that, one only rivet near the trailing edge of the rudder should be ok. As Carlos said, the rivet, to a degree, will fill the hole so I wouldn't be to concerned. Think how strong you rudder would with this rivet missing completely. It wouldn't make any difference to the structure at all. If the strength of our airframes was compromised through the failure of one rivet, I don't think that anyone would ever leave the ground. Maybe when you do your other control surfaces the use of a wood dowel drill stop is a good idea. We all make mistakes Patrick so don't sweat it mate.
i bump into this website from FAA,
AC 43.13 , is this the correct book for young builder like me to read and go through? i am building a ch750 for this 2011. please advise. thanks
AC 43.13 is a LOT of reading, my paper copy is about two inches thick. However, it is a wonderful reference for building, repairing and maintaining any aircraft, certified or experimental. You can learn a lot just reading through it, but it makes a wonderful reference when you wonder how much edge distance is needed, what are the standards for a properly set rivit, how to use the AN and MS aircraft hardware nomenclature, etc etc.
If you want a paper copy, EAA sells them and the profit goes to a good group. If you just want it available, the downloaded version works well and costs nothing. Enjoy!
Patrick: only one bad rivet! I should get you to build my 750! Don't sweat it. Have fun! brian