A friend who is learning rock climbing has asked me to recommend a Prusik-type loop knot. So I am not going to consider the Mark Adams illustrations which are not tied from loops.
I tried the Prusik, Bachmann and Klemheist initially with two wraps of slippery Dyneema 3/16 (4.8 mm). I used two variations of the Bachmann and Klemheist: the working loop-end at the top with the SP at the bottom (towards the load) and the reverse. It is interesting that Budworth shows the Bachmann in the first configuration, but has the Klemheist in both, as if he didn't have a preference.
With two wraps, the Prusik easily slipped. The Bachmann slipped with the SP at the top and was tighter but still slipped intermittently with the SP at the bottom. The Klemheist was tight with two wraps in both orientations. With three wraps, all were tight, but I was left with the conclusion that the Prusik is best avoided if you know the others. And that the SP should be at the bottom, towards the load.
After tying the Prusik, Bachmann and Klemheist I have concluded (as a non-climber who has never tried these knots for real) that the Klemheist with the SP at the bottom is the easiest to tie and the most secure, but the Bachmann has a carabiner to hold the structure of the knot in place (which would be comforting if my life depended on holding that structure). However, the carabiner also reduces the gripping surface of the Prusik cord. So I have tried tying the version in the picture. What do all you real climbers think of this? What do you use?
Please ignore the cheap carabiner in the picture. It is what I have here for the picture.
For a real Prusik loop (if I were really climbing), I would probably use Bluewater 5 mm Perlon and put it through a 10 mm carabiner with the knot version in the picture, wrapped around a 10 or 11 mm climbing rope.
Any thoughts positive or negative ?
Thanks,
Mike