The minimum grip spec on these seems to be widely ignored with no
adverse effects that I'm aware of. As long as the mandrel doesn't
protrude (they don't on mine).
You are perhaps already doing it but some folks like to drill to final
size AFTER dimpling so that the hole is more precisely sized and
parallel for the rivet. Or I seem to get acceptable results by drilling
to 1/8" (instead of #30) and then dimpling. I used Q rivets in a few
specific locations but while they are stronger (and pricier), they don't
expand radially like the avex rivets so they are not a universal
subsitution.
Ken
Charlie Eubanks wrote:
Hello All
I am just getting a good start on building my Rebel. I have completed the ailerons, flaps and the rudder and am presently working on the elevators. I have built three other metal aircraft before that used mostly the solid AN type rivets. Rebel's all Avex blind rivets are a lot easer but I have encountered a couple of places where I think solid rivets should be considered. For example the dimpled outboard ribs and skin of the rudder and elevators. I didn't just want to arbitrarily replace the Avex rivets with out giving it some thought and studying the available data. The manual talks a little bit about edge distance, maximum grip length and displays a chart of all the rivets used in the kit. It really does not get into the design data of their rivets. I downloaded some data from www.avdel.trextron.com which revealed that the 120* countersunk rivet RV- 4412 has a grip range of .093 Min. to .250 Max. I am sure a number of you have already done this, but I made up a few test cou
pons of two pieces of .020 thick
aluminum each, In one I drilled six # 30 holes, two of these holes I dimpled. I then pulled two RV-1410 domed rivets, two 120* RV-4412 countersunk rivets and drove two 1/8 x 1/4 solid rivets. In this sample I band sawed through the rivets centers, sanded and polish the sawed edge to get a good look at the cross section of the assembly. The rivets all looked good except the RV-4412. In the other sample I dimpled 4 holes and pulled 4 more RV4412 rivets. I found the countersunk rivets could (with some effort) be rotated by hand between the thumb and index finger. I am not a student of the entire manual yet so I don't know if their or other thin, dimpled assemblies where this rivet is called for but after seeing this I have decided to use AN type rivets in these type of assemblies.
Charlie E. Rebel 802R
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