dgw
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Everything posted by dgw
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Thanks for the information Rob, and others. Very interesting stuff. I guess, like many design problems, there's a balance to be struck. Under 'normal' loading, you want sufficient pull force to ensure that the white loop has sufficent grip on the lolon cable so that the risers don't release if the cut-away handle is floating. On the other hand, under 'abnormal' conditions, you still want to have enough mechanical advantage to allow a release of the risers. Whatever way you slice it up, when you line up a three ring release with the Capewell system (which I did), the three ring system makes me feel warm and fuzzy on the inside, whereas the Capewell system looks like a bad day out.
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QuoteIts more like pullys then a fulcrum lever problem, but kinda in-between really. I think (and I'm no expert) pullys pertain to mechanical advantage when the force is transmitted through a flexible mechanism (a rope or its ilk). In the three-ring system, the mechanical advantage is acquired through rigid (round rings) levers. Notwithstanding this, the fundamental parameter (for leverage) is the distance between the 'top' of the system, and the lowermost fulcrum. Interesting info about the Tandem risers though. Thanks! Darren
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I was wondering about the three ring system. I have recently acquired, for the craic, an old school harness/container with some form of Capewell release mechanism (I think). It looks like a real dogs-dinner of a release system compared to the three-ring release. I was wondering if anybody has considered why three rings are used in the current release system, as opposed to two or four (or *five*)? It seems to me that the same mechanical advantage could be achieved with any number of rings (with the exception of a single ring), provided the sizing was appropriate. Having had this thought, I further wondered if higher cut-away forces associated with mini-rings, compared to normal 'large' rings, could be mitigated with a mini-four-ring system? (More bling for your buck). This post is not a slight on the three ring system. It is wonderful. I'm just interested in any views regarding 'flexing' the design parameters, and only for the sake of discussion. Darren
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And again... http://cgi.ebay.co.uk/Brand-New-Complete-skydiving-rig-mirage_W0QQitemZ230023930613QQihZ013QQcategoryZ47021QQrdZ1QQcmdZViewItem
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Here's an article from The Sunday Times. A relevant article. http://www.timesonline.co.uk/article/0,,2087-2200250.html