Figure 9

[knudeNoggin]

With the LOOP of the D[irectional]F9 loaded

It would be great to have photographs of the knot at the start
and then at some guesstimated near-80%-capacity states, to try to
understand what geometry is at play here.

(as a comparison the through-rope strength for a directional Figure-8 tends to be about the 60-70% strength range expected from all Figure-8 knots. We haven't got enough data on the DF10 to confirm figures but a few tests this afternoon showed it behaves similar to the DF9, with a very low through-load strength and a likening for untying itself...)

This seems surprising to me. The end-to-end loading of a Dir.F8 is
quite different from that of a Fig.8 bend or loopknot (as I noted above,
it's like a Reef knot), and the Fig.10 is more entwined. Again, one needs
to know exactly what geometry (how the knots are tied) is at play here.

Thanks for the data!

*kN*

[LifeOnALine]

I'll post some photos in a few days - tied up with work and away from my files at the moment!

~DM~