Re: Cotton Carrier Side Holster vs. Spider Holster
that would be carabiner. the ones pictured below are 7075 series Aluminum alloy.
i\'ll have to explain to Black Diamond, Mammut, DMM, Wild Country, Omega Pacific and a few others that their use of alloy biners in Technical climbing is totally inadequate even though the rated load on thes gate closed is about 24KN and open gate 7KN. oh by the way those are the PROFESSIONAL makers of CARABINERS in the world plus a few more. i climbed since 1972 and even back then it was aluminum alloy biners. they were heavier then the ones today. never had a biner fail just the rock around where the chock was placed. we don\'t use steel. the middle one called the xenon lite weighs in at 29gms and has a UIAA closed gate strength of 24KN or 5395lbs. you get anywhere near that load and your jello
most of buckles and snaps today are made from polymer materials that are used in 98% of camera bags and 100% of heavy load bearing mountan backpacks. these buckles have held my F4s F5 1Ds 1Ds2 1D3 40D XTi and my current D3 and D700 including a 70-200/2.8 and the occasional 300/2.8 too. all major manufacturers use these buckles. the lexan material used on the Cotton Carrier is substantially stronger then any of those products.
lexan will flex bend chip craze crack. these are all visible results of use and abuse that may lead yo failure. if it reaches ultimate yield with the cotton design you\'ll know about it as your being dragged for a few yards first. or the 1/4-20 thread ripped out of the bottom of you $5000 camera body.
oh, also i ride Cannondales (both mountain and road) and have done so for 20 years. used to rip it up pretty god back then too.
alloys and catastrophic failure. most alloys stretch and deform before failure and and the joints small cracks form and if you actually look you will see them. neither composite or modern alloys used in situations properly have catastrophic failures unless you allow them to fatigue well beyond its operation parameters. that said these limits a generally well beyond human tolerance. composite is the problem child of fatigue testing though. a crush is easily seen. alloys are easily zyglo dye penetrant inspected or eddy current inspected for serious loading.
how about Jet Fan blades (C1) with leading edges of Ti alloy w/ Ti web and the rest composite (the black painted part). they take a pretty good beating right?
welcome to the GE90 in service for over 12 years now. does regular (daily) over the north pole trips to Beijing, Shanghai, HK. sucked in a few birds during its time with us. just had to wash em out so far. quite literally hundreds of thousands of fleet hours in our fleet.
for size reference. this gentleman is approx 6ft tall
takes a lickin and keeps on spinning
the materials world is advancing quite rapidly. i think you need to reevaluate these advances even on a consumer level. you ain\'t seen nothing yet.
as with any gear you use for whatever purpose you use if for you have the responsibility to inspect it for your and your gears safety.
Mar 07, 2010 at 01:08 AM
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