Tachyon is 24 strand double braid with a core. That is, a typical double braid is a braided rope within a braided rope. The inner braided rope is hollow, and, depending on how tight the weave is, there is some amount of squeeze or bagginess. Tachyon's inner braided rope has a core, so the rope is firmer and stiffer than typical double braids.
Attached is one side of NER's sell sheet for Tachyon.
This is a post I wrote for the thread NeoPro Reviews in Rigging and Roping:
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When the 11mm lines came out they were were touted as being lighter and having less surface friction. But, because of the smaller diameter, they are more difficult to hold and pull.
Interestingly, rope manufactureres have addressed this issue in different ways.
New England introduced Tachyon, which is a 24 strand double braid with a solid core, so that it maintains its shape and is easier to hold.
Samson introduced Lightning, which is a 1/2 inch 16 strand, so that it is easier to hold, with a new type of core, so that it is lighter than traditional 16 strand lines.
All Gear introduced NeoPro which is a 16 strand, so that is easier to hold and has a familiar feel, but is 7/16 inch, so that it is lighter than traditional 1/2 inch 16 strand lines.
Three different approaches to making climbing easier.
Yale has had great success with Blaze and did not introduce any new climbing line.
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