Quote from Manual...
You have to decide for yourself. But from the photos, which could be deceiving, none of these look that bad me. I'd take a rivet gauge to them.
I'm certainly not saying that you shouldn't continue to improve your riveting technique.
If it helps any, here's a quote directly from the RV-14 manual section 5.
"One of the common calls we get is "I had to drill out a bad rivet and now the hole is oversize. What do I do?" Sometimes this is done multiple times in the same hole and now the hole is so large that the builder has to use a bolt and nut instead of a rivet. To relieve the anxiety sometimes associated with an imperfectly set rivet and to avert potential problems arising from
ill-advised attempts at
repair, (not to say 'never
repair a rivet'), guidance
in the form of an excerpt
from the Alcoa Aluminum
Rivet Book, dated 1984,
is provided here"
"The standards to which driven
rivets should conform are frequently
uncertain. In addition to dimensions
and perfection of shape, inspection is
concerned with whether the drive head is
coaxial with the shank (not "clinched") and
whether there is excessive cracking of the heads.
It has been determined that even badly cracked heads
are satisfactory from the standpoint of static strength, fatigue strength and resistance to corrosion. (Poorly set and cracked) rivet heads were tested in tension to determine how well formed a head has to be in order to develop full strength. The tensile strengths of all the rivets were within five percent of the strongest. The test indicated that minor deviations from the theoretically desired shape of head are not cause for concern or replacement. The second rivet that is driven in any one hole [is] likely to be more defective than the first because the hole is enlarged and [the] rivet will be more likely to buckle and form an imperfect head. Tests have shown that very small rivet heads are sufficient to develop the strength of the rivet shank, even when the rivets are subject to a straight tensile pull....where a large head is not needed for appearance, smaller sizes of drive head should be used to decrease the required driving pressures."
Michael-