Friction Hitch Testing

Mangoes

Mangoes

Participating member
Location
Greater Toronto Area
Wondering if anyone can diresct me to some performance testing (goverment or ps). Ontario just had some done and I think there are some variables that weren't entirely analyzed.
 
Paolo Bavaresco (Lazarus II) also did a pretty detailed study of friction hitches. You should be able to reach him through this site. I have a copy of the report, but I don't know if it is for public distribution and I don't want to forward it without his ok.

I also have Ian's report, but again, I don't know if it is for public distribution and I would really have to dig to find Ian's contact info.

Hope this helps.

Can you post a link to the Ontario study?

Thanks!
 
The ont study was briefly outlined at our annual conference in Feb. It was said that the study wasn't available until June/July to anyone but the funding parties, which as I recall were, Davey, Bartlett and the Research Trust. Kind of bugs me that its all so hush hush. Funny thing is that the Arborist Safe Work Practices Final Draft is to be critiqued by the end of March, as it will then go to final draft. Problem is that it now restricts all vt based friction hitches. The only ones that pased were the Tautline (bull$hi! test as the knot rolled out like 6-8 inches to the stopper knot) Blakes, Schwabisch and the Gripping Hitch (never heard of) So how can we acurately evaluate and critique a document if a part of what the document is based on is being held for those that funded the testing only. As well isn't the resaerch trust something that I pony up money for? And doesn't that make me eligible?
 
I know who did the testing by name, but.......

They had a dyno at a TIP aprox 15 feet off the ground. "uppers" were tested on an SRT set up. FH's were apparently tested in a DdRT set up (heres a flaw). A 100kg weight was hung from the system to set the knot, and then susequently dropped from a height of .......120cm. The peak shock load at the TIP was measured as well as the slippage of the hitch. Anything over a 15cm slip failed. Problem here cause 15cm of slack in a DdRt sytem only constitutes a 7.5cm drop of the weight, logical?
The Knut for example slid 22cm, and is therefore illigal for use in Ont. They used 1 type of half inch 16 strand with three eighths spliced tenex eye and eye. No attempt to consider characteristics of different cordages.
 
This test will determine LEGAL and ILLEGAL practices? Covertly carried out with funding from special interest private parties as well as public tax dollars? Typical.
 
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