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The Schwab
is an asymmetrical Prusik
with four upper coils and one lower coil. Compare this with the
Schwabich which has three and
one, respectively.
Cavers generally don't use asymmetrical Prusiks
because they cannot be tied with a loop of sling (unless the free
end of the main line is available), but arborists often tie their
knots using open slings with eyes in each end, and they’ve found
a use for this knot in their trade. Adding coils to the top of
a Prusik makes it hold better when
loaded, and also makes it easier to release and slide upward.
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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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