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The
Valdôtain Tress, or VT, is a popular knot among arborists,
but I do not think it is a good ascending knot for cavers or climbers.
The knot is a cross between the Penberthy-Pierson
on top and the French Prusik
below. It consists of four coils followed by two crisscrosses
at the bottom. The resulting knot has a lot of elongation that
leads to considerable lost motion (inefficiency) each time it
is loaded. This is not a particular concern of arborists, but
when using knots on a long free-hanging pit climb, I prefer a
knot with less elongation.
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Note: The performance of any ascending knot depends on the diameter, material, construction, and condition of both the main line and the ascender knot sling material. It may also depend on exactly how one ties the knot. Your knot’s performance can easily differ from mine. |
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