What’s the big deal with the Aloft Alone rope and eye?

I have been asked on multiple occasions why we use the polyester/nylon line for Aloft Alone, and not just use the existing yacht halyard. The first answer is that the diameter of the rope works perfectly in accordance with the gear that makes up the Aloft Alone system.

The second answer to this question is not so obvious; the rope we use has been carefully chosen so that it works perfectly with how the equipment is used on it: it runs well through our devices, it does not ‘work harden’, and it’s a rope that’s tried, tested and respected by professionals the world over.

It’s also bright orange – how awesome is that?!

Thirdly, I would like to write about the stitched eye with stainless thimble: using this method, I have worked hard to reduce the distance between the yacht’s halyard and the Aloft Alone (orange) rope. Obviously, the less clutter or distance you have between these two means more of your body gets up and over the top of the mast. To enable this short yet super strong connection, I met with and contracted Anna Tregoweth of Shift2 based out of East Tamaki Auckland.

Anna does amazing work and beneath this are her words at what she does to create the triple stitch eye loop.


Triple stitching process . Note, this is not actual Aloft Alone rope nor does it show the stainless steel 316 thimble.









Hi Andy

I have attached a picture showing the creation of the 3 layer stitch pattern I use to stitch your rope size. The first layer (on the right) starts in the middle and only connects the outer sheath, the second pass is a little wider encompassing sheath and core, and on the last pass the full width is captured, generally up to half the rope diameter for maximum strength.

We only use Anefil Polyester twisted, high-tenacity, multi-filament thread made in the USA. Anefil Polyester is exceptionally strong for its weight and offers superior UV resistance and seam durability when stitched into ropes likely to be used in adverse work environments.

We then finish all of our stitches off with a clear heat shrink to protect the stitch and so we have the ability to label your rope.

Shift2 also test their ropes to destruction using the method described below. Critically, the rope always fails before the stitch. As Anna describes:

I have also given you one of our testing sheets on the kernmaster rope that you use (see below). Our break-tests use 12mm pins, to simulate the approximate size of a carabiner. We set up e2e stitched ropes and hydraulic rams and pull the rope apart until breaking point where the results are graphed for later inspection and analysis.

The manufacturers spec sheet outlining the reasons why we, and you should use kernmaster rope, is pasted below:


POLYESTER/NYLON CONSTRUCTION (Polyester Sheath/ Nylon Core)- Provides a greater range of chemical resistance than the traditional Nylon/Nylon construction. It is unlikely to encounter a chemical that would affect both the cover and core.

STRENGTH- Exceptional tensile strength. 3225kg for 7/16” and 4,770kg for 1⁄2” These ratings exceed most other manufacturers.

BRAIDED CORE- Core bends more easily with less fatiguing. This makes for better knotability, better control through mechanical ascent/ descent devices, as well as increased strength. Also in the event of a cover failure, the rope core will remain intact, allowing the user to ascend/ descend over the core to get back to a stable portion of the rope. Yale Kernmaster is the only life rescue line which uses the braided core technology.

STEAM STABILIZED CORE- The core is fully steamed stabilized which enhances the rope flexibility and prevents hardening during service.

PERFORMANCE- The 1⁄2” Yale Kernmaster is the only 1⁄2” Life rescue line that will operate effectively through a Petzl Gri-Gri, ID20-S, ID20-L, Petzl Stop Descender, Large rescue 8, Gold Tail/ Whale Tail, SRTE Stop Descender, and SRTE No Worries. Both the 7/16” and 1⁄2” versions of Kernmaster are “true” diameters. They will retain this diameter throughout their life and not expand or fluff out like many other brands. This ensures hardware compatibility throughout the ropes life cycle.

AVAILABLE LENGTH – Yale Kernmaster is available in continuous lengths of up to 730m ex stock , compared to 400m for Edelrid and 240m for Blue Water.

WATER RESISTANT: Having a Polyester cover Kernmaster sheds water far more readily than a traditional nylon/nylon construction. Also the drying time of the rope is dramatically reduced due to the polyester being non hydroscopic.
An additional benefit is that there is no discernable strength reduction to the rope when wet. With full nylon/nylon ropes up to 20% strength reduction can be expected when the rope is wet.

Due to Kernmaster’s water shedding ability, it will not stiffen when wet, and still runs through mechanical devices with ease.

DIELECTRIC RATING: Independent testing has shown Kernmaster to have a better dielectric rating than that of competitor product.

LONGEVITY: Yale back a 10 year life expectancy for Kernmaster providing it is stored in a cool dry environment out of UV light. (Obviously once the rope is put into service this life expectancy is no longer guaranteed due to the great variance in field conditions).

Due to its unique construction Yale Kernmaster will not work harden during standard use and will retain a consistent diameter throughout its life ensuring a longer service life than competitor brands.

EXCLUSIVITY: Yale Kernmaster is made exclusively for Treetools New Zealand in the Bluetongue, Orange code Blue and Blue code Orange colours.


Cheers Andy

Climb Safe