In his book Prusiking, Bob Thrun divided ascender knots into "knots consisting entirely of rope" (which I now call "ascender knots") and "semi-mechanical knots." I've chosen to break the latter into "carabiner knots" which use only a sling and a carabiner, and "semi-mechanical ascenders," which include the rest.
Paraphrasing Bob, carabiner knots and semi-mechanical ascenders use the sling rope to do most of the gripping. The semi-mechanical ascenders in my collection appear in the first table, and the carabiner knots are discussed below.
|Eight-Link||8-link for connecting chain, for Eight-Link or Heddon Eight-Link knots||
|176||H-Bar, Version A||Two 7/16" steel side bars with two 1/4" steel crossbars, for semimechanical Prusik||Gary Storrick, 2004||122||70||60||11||46|
|177||H-Bar, Version B||Two 7/16" steel side bars with two 1/4" steel crossbars, for semimechanical Prusik||Gary Storrick, 2004||133||74||58||11||48|
|107||Interalp Camp Look||Forged Al plate /w notches, for single or double rope.||Repetto Sport, 1982||58||98||42||8||33|
|2303||Rope-Tek Hitch Hiker 2||Riveted steel channel, steel dogbone||Pinnacle Arborist Supplies, 2017||311||90||51||63||291|
||Forged Al block /w hole and notch, for semi-mechanical helical knot.||
||Small hardware store snap link, for Varnedoe V-knot.||Tru-Value Hardware, 1989||25||77||27||10||21|
|112||Storrick, Version A||Hand cut Al block /w hole and notch, Salewa copy, noncommercial||Gary Storrick, before 1982||22||35||34||10||12|
|259||Storrick, Version B||Milled Al block /w hole and notch, for semimechanical helical knot.||Gary Storrick, 2008||11||31||26||7||6|
|3442||Storrick, Version C||Milled Al block /w hole and notch, for semimechanical helical knot.||Gary Storrick, 2021||9||29||25||6||5|
|3443||Storrick, Version D||Milled Al block /w hole and notch, for semimechanical helical knot.||Gary Storrick, 2021||9||31||25||6||5|
|2294||Thrun, Version A||Drilled Al plate with 3 3/8# holes, for semimechanical Prusik||Bob Thrun Collection, 2017||30||63||26||6||10|
|198||Thrun, Version B||Drilled Al sheet with 2 5.16" holes, for semimechanical Prusik||Gary Storrick, 2005||6||51||20||3||3|
I placed the carabiner knots in a separate table because the weight and dimensions depend on the particular carabiner being used.
The Gallery shows the following knots, which form a small portion of all the variations invented over the years:
|Bachmann Knot||Cheater Knot|
|Bachmann Knot with Turns
|Bachmann Ring Knot||Marlatt Knot|
|Carabiner Hedden||Prusik Around Carabiner|
(a.k.a. Bachmann 1947)
|Carabiner Prusik||Snap Link Twist|
I would like to thank Franz Bachmann for letting me know of the history of his knots that he makes available at http://www.eneafiorentini.it/icorsroc/nodroc1.html, and for the nice comments he has made there about my site.