Valdotain Tresse still #1 by a long shot - (Knot performance with different rope products)
Yesterday I was psyched to climb and try various configurations.
So I climbed on a Chestnut Oak that has 1/2" Yale XTC set up for DdRT, running thru a steel ring Buckingham falsie at the top end. But that low friction from the rings is countered by at least two branches that contact the rope on its way down. My 10mm Bee Line eye-to-eye just would NOT grab that 1/2" line using a Schwabisch prusik. Of course I didn't mess about with it for too long because it's not worth my time. I ended up trying an 11mm tail into a loop and Hedden. After that I went up again using the same 11mm loop tied in a Klemheist on another tree. And then for my third climb, I bagged the experimental and used the Bee Line tied in a Valdotain Tresse.
The Hedden, and to a lesser extent the Klem, are not ruling configurations because if you have to adjust your position and descend a little with only one hand on the knot, once you break the hold, they often continue to slip until you ascend again, which re-locks them. Not good if you're doing a paying job, which I wasn't. But still, I did need to reach to my limit to cut off a few sprouts. Even minor tasks aloft are easier if you can depend on your hitch to release and grab with only one hand to work it. I'm spoiled by the VT. It does exactly as you expect, everytime, with no exceptions, using any old combination of rope brands or composition, so long as the rope size ratios stay pretty much the same.
The Schwab prusik worked flawlessly for me a few weeks back, using Ultratech for my eye-to-eye over the same Yale XTC Fire.
And last month during a paying job, the Schwabisch grabbed perfectly with 10mm Ultratech over 1/2" New England Ultravee. I'm cautious when adjusting it with one hand because because of the way can release "for good" with slack. But for the most part, when there's tension on it, it grips very well. As a matter of fact, if I use a Tenex eye-to-eye it locks a little too well, especially on a 12 strand like Arborplex. Then releasing with one hand gets too difficult.
So what's the point? Point is, no matter what my experience has taught me about a sure-fire setup, for me climbing will always be about trying new things. (After I prove them to be safe in a controlled way.) So I will never stop experimenting. But after all is said and done, the VT absoutely RULES. For the amount of time I have spent re-tying or wringing the windings on a Blake's when it doesn't want to grab, or not advance freely enough, and all the other BS involved in making various hitches "just right", I just don't have that nonsense with the VT.
Tie it the way it's illustrated in the Tree Climber's Companion - 4 loops, 3 braids, and a micro-pulley.
It ALWAYS grabs perfectly. It releases predictably (with varying degrees of effort depending on your eye2eye/lifeline combination) and when you let it go, it stops DEAD. It NEVER, EVER slips.
I have read about the possibility of a VT inverting and failing. If anyone knows of this happening with the micro-pulley, I'd be interested to hear about it. Maybe without, but with the pulley I don't see how.
That's it - my .02
Get hitched!