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    Knot Starting Over!?!

    per *useless info* I am unclear if you are directing this question to me? If yes, and you are referring to the AZTEK drop tests... i would comment that in my test it was configured to induce FF 1.0. This resulted in total destruction of #1763 Prusik hitch on host Sterling 8.0mm cord. Richard...
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    Knot Starting Over!?!

    per Brocky: This question comes in 2 parts: Q1. As stated above - it's a standard AZTEK I'm surprised that you are unaware of an AZTEK? An AZTEK would be a very handy bit of kit for tree rigging work. Built from 6.0mm hitching cord on 8.0mm host cord. Q2. Sterling USA are the manufacturer of...
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    Knot Starting Over!?!

    Yes - I understand your underlying motive for starting this thread. What I am struggling with is how to interpret what you write - in the context of slide and grip hitches employed in tree climbing applications. The construction of this paragraph and the manner in which language is used makes...
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    Knots for joining two ropes for life support

    Interesting that your attached image doesn't mention that the #1439 Carrick bend tying method (as shown) results in capsizing to arrive at the final load stable geometry. Step #3 in the tying sequence shown is a transient state - which capsizes to reach the final step #4. It is also possible to...
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    Knot Starting Over!?!

    That's a different proposition. Again - what I was stating is that fundamentally, when a person ties a slide and grip hitch, it will be formed either from a round sling (ie a circle), or it will be formed from a linear open ended length of cord. What you are discussing is actual loading profile...
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    Knot Starting Over!?!

    RE: Explaining how a Zeppelin bend works and why it is jam resistant (in contrast to #1425A): I am unable to extract anything meaningful from this explanation. This is starting to make a little more sense but, it does not explain why one jams and the other doesn't. You are simply attempting to...
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    Knot Starting Over!?!

    That wasn't my point. What I was stating is that a slide and grip hitch can fundamentally be built from either of the following: 1. A circle (ie a round sling); or 2. A linear open length. Within the tree climbing industry, there is a tendency to form slide and grip hitches from linear, open...
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    Knot Starting Over!?!

    *useless info*, I would like to see you apply your theoretical concepts to the following end-to-end joining knots: 1. Zeppelin bend 2. #1425A Riggers bend. One is totally jam resistant right up to its MBS yield point...while the other horribly jams. Zeppelin is built from 2 superposed loops...
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    New Petzl GriGri 3 (2019) vs old GriGri 2 (2015)

    Although this is drifting further away the original posters question/thought process... And I would also comment that the context of this forum is tree climbing (not rock climbing). And so forum posters may be thinking about belay devices and their associated risks from a different viewpoint...
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    New Petzl GriGri 3 (2019) vs old GriGri 2 (2015)

    climbstihl: With all the iterations of GriGri's released by Petzl, it is starting to get confusing. I prefer to categorize all GriGri's according to the rope diameter they can accept. Third Generation GriGri's are capable of 8.5mm. Third Gen includes both the 'GriGri+' and it sister model...
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    New Petzl GriGri 3 (2019) vs old GriGri 2 (2015)

    No. When I write about GriGri's, I write in terms of 'generation'. #1 = first generation - down to 10mm #2 = second generation - down to 8.9mm #3 = third generation (ie GriGri +) - down to 8.5mm The third generation of the GriGri (branded as GriGri +) has the anti-panic feature and is rated to...
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    New Petzl GriGri 3 (2019) vs old GriGri 2 (2015)

    No iteration of the Petzl 'RIG' ever had an anti-panic function. Only the Petzl 'ID' had the anti-panic function (before introduction of GriGri #3). Edit note: #3 means third generation (ie GriGri +). In addition, the Petzl ID has an anti-error catch, which is intended to act as a 'failsafe' if...
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    Decoding Patterns of Forces

    per *useless info* Except that this approach fails when applied to non-jamming knots such as the Zeppelin bend. This 'bend' remains jam resistant right up to its MBS yield point. I would also comment that in all of the primary Bowlines based on single or double helical nipping loop, the...
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    New Petzl GriGri 3 (2019) vs old GriGri 2 (2015)

    Jan - to specifically answer your question re the GriGri #3. First and foremost - one must point out that Petzl did not manufacture any GriGri product specifically for the tree climbing / Arbor industry. That is not Petzl's target market. With that fact in mind - the rest of the product...
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    Rope bridge, finally. Now what knot?

    JeffGu, although drifting off the original posters topic: The 'Safeguard' works on 11.3mm diameter rope quite well (but I am splitting hairs over 0.3mm difference...but just pointing out that 11.0mm is not the absolute limit). In fact, it also works quite well down to 8.0mm diameter cord...
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    Knot Starting Over!?!

    A good first step is to organise the various knots into logical groups. Knots used in life critical applications can be grouped as follows: [ ] fixed eye ... (eg figure 8 family, bowline family, etc) [ ] mid-line 'Tiable-In-the-Bight' (TIB)... (eg clove hitch, #1053 butterfly) [ ] end-to-end...
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    Rope bridge, finally. Now what knot?

    If you want an adjustable rope bridge, I would recommending installing a 'Safeguard' (made by Madrock USA). Unlike the CT Roll n Lock, it uses a smooth cam that will not damage the host rope material if shock loaded. Furthermore, it allows full adjustment in both directions even while under...
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    UK Arb moving to two ropes at all times (USA next?)

    Correct. The original poster ought to have used a different construct to announce this information - as you can see by most of the replies - it is ringing alarm bells in peoples minds (unnecessarily). Facts: 1. The UK HSE does not write legislation (ie the law). That job falls to the Parliament...
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    Odd knots

    The notional concept of 'strength' is an urban myth that is endlessly propagated. There is no load that a climber can generate that will reach the MBS yield point of a knot (eg eye knot). Of greater importance (and relevance) are the properties of jam resistance, whether it is 'TIB', biaxially...
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    Biner gate opened during climb

    Hello 'Bart', I seems that no one has asked you exactly what type/design carabiner (connector) you were using when the gate became unlocked.... One assumes that is was some type of 'locking' carabiner? But, what is not clear is the design of the locking mechanism. For example, was it a dual...

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