How is the Triple Fisherman a stronger knot than the Zeppelin Bend? I haven't seen any evidence.
I'm not even convinced the Triple Fisherman is more secure generally. I'm not referring to your shake test. I mean brute force pulling in slippery rope.
You're avoiding the issue. Why would you judge strength not by percentages of rope strength but by irrelevant behavior after rupture?
The tests you cited made no mention of slipping before rupture. Slipping after rupture isn't a security issue.
I'm right at the issue that I original brought up.
According to the test in the source I cited above, "The sheath breaks
at the knot and the slippery core unties, pulling the sheath through."
That is, the sheath breaks
at the Double Fisherman Bend. I'm wondering if that same sheath would break
at the Zeppelin Bend in the first place. That brought up my comment about how the Zeppelin Bend may be easier on the rope than is the Double Fisherman Bend. I don't know, but would like to know.