Ponys only. Isaacs are hard to come by....and I don't need a pony.
I will, however, be happy to accept a free ISAAC...
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With all due respect Stan I must wholeheartedly disagree with your statement. The commonly mis-quoted "single-point-of-release" rule actually states "The phrase "single point of release" on the other hand means to me exactly what you and many others have expressed, that there must be a single point, somewhere in the harness system, that when activated releases the driver from the harnesses. If the rule in fact stated there must be a single point of release I would agree with you completely. However that is not what the rule says, and to my way of thinking there is nothing in section 20.4 that would preclude me from using the ISAAC, or any other H&N device regardless of how it functioned. Of course, that's just one man's opinion.that still leaves the single-point-of-release rule (GCR 20.4) in place...and the ISAAC still non-compliant.
Stan
PS - I have nothing against the ISAAC...just pointing out the glaringly obvious. [/b]
Earl,With all due respect Stan I must wholeheartedly disagree with your statement. The commonly mis-quoted "single-point-of-release" rule actually states "The shoulder harness shall be the over the shoulder type. There shall be a single release common to the seat belt and shoulder harness." And no, I'm not playing silly word games. There is a huge difference between "single release" and "single point of release" in my opinion. "Single release" refers to the mechanism that attaches the individual components of the harness system together, and as far as 20.4 is concerned means that there must be a single mechanism, or latch, to which all the individual harness pieces attach, and which when activated releases the harness components from each other.
The phrase "single point of release" on the other hand means to me exactly what you and many others have expressed, that there must be a single point, somewhere in the harness system, that when activated releases the driver from the harnesses. If the rule in fact stated there must be a single point of release I would agree with you completely. However that is not what the rule says, and to my way of thinking there is nothing in section 20.4 that would preclude me from using the ISAAC, or any other H&N device regardless of how it functioned. Of course, that's just one man's opinion.
Oh, and one last thing; even though I disagree with you on this issue, I also want to thank you for taking the time to stop by and join in the discussions when you are able. I know every member of this forum really appreciates the fact that a member of the CRB is listening to our opinions.[/b]
Well, that woke everyone up.
Regardless of which way the vote went, I agree that the fat lady has yet to sing. I also agree with Dave that the time is ripe for a more proactive stance, which reminds me of an observation made recently by a party who shall remain annonymous. Allow me to paraphrase:
Annonymous Party (AP): "So, an Isaac is as good as SFI designs in frontal impacts?"
Me: "Well, you can tune a HANS to get under 1,000N neck tension on the Delphi sled, which is better, but you need a four belt shoulder harness."
AP: "That's great if you hit something at 300Gs, but you're dead by then anyway, right?"
Me: "Right. Soft tissue injuries in the chest cavity start around 150Gs or so."
AP: "And no SFI design can touch an Isaac on side impacts, right?"
Me: "Not even close."
AP: "And SFI designs can lose the belts in amateur road seats whereas the Isaac will keep them in place on the shoulder -- and they can cause egress problems, right?"
Me: "The SFI designs don't always have those problems, of course, but they can, yes."
AP: "So, it is then safe to say that SFI designs don't really offer any practical safety advantage over the Isaac designs, and have documented safety weaknesses, right?
Me: "A good summary, yes."
AP: "And the SCCA wants to use SFI as a point of reference, right."
Me: "They prefer referring to an outside standard, yes."
AP: "Then the solution is obvious."
Me: "What's that?"
AP: "Petition the SCCA to ban all SFI head and neck restraints."
Sounds good to me.
Oh, one other thing that I didn't want to bring up before the vote because it would just muddy the waters. A free pony to the first person who can name the day jobs of two of the three members of the CRB's Safety Committee, listed about a third of the way down the page here: http://www.scca.org/Inside/Index.asp?IdS=0...30&x=080|070&~=.
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In effect. The spec (38.1, section 2.5) goes to this single release issue.I didn't know SFI designed H&N restraints???
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Following is a portion of my letter to ALL those people at SCCA. Racers.****
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But forget the rules and look at instances where drivers are trapped in their cars by head and neck restraints. Every time it has happened -- every time -- it has been by a product that conforms to this odd interpretation of 20.4 to which you refer. Never an Isaac system. So even if that interpretation of 20.4 is correct all of the evidence says it is the more dangerous approach. What do you do with a more dangerous interpretation of the rule? Enforce it?
Greg,
I'll play Devil's advocate for a second without offense I hope, as you know I use the Isaac.
There would be more instances of drivers hanging up with a HANS simply because the numbers of HANS users is higher. It becomes a much more powerful (number of participants) study. If 1 in 1,000 users get hung up and you only have 500 users you may not expect to see hang ups....yes?
That is part of the enigma, shrouded in mystery, wrapped in a conundrum that I see with this whole thing. Sometimes "the people" get confused with pseudo-science (it's even easier to get a lawyer to bite on pseudo-science). The bottom line is unless we have enough users out there with documented crash histories we may not be comparing apples to apples in "their" eyes.
I chose the Isaac because the science was good. But, then again....I understand science.
R
......
2. A separate requirement defining minimum egress time requirements - since it seems like this is an issue that we care about. The number of releases (or whatever) is an weak-at-best indirect measure of the time required to get the hell out of a crashed car. Since it is the latter that we care about, rather than the former, the policy should act directly on the desired intention of the rule. Add an item to the GCR that requires that drivers demonstrate, at the request of the appropriate officials, that they can get all the way out of their car with all of their accoutrements in place. If they want to handcuff themselves to the wheel, that's their own how-do-you-do, as long as they can get out in XX seconds.
....
K
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