Why are my Vytec and Cobra so different?

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Genesis once bubbled...

As I noted earlier in the thread

Sorry, I saw you and Jamei go at each other again and skipped to the end of the thread. Looked like it was the same argument, just in a different thread.

Drew
 
It pretty much is, other than the additional evidence that I've amassed since that time, including actual dives on the Vytec with PO2s approaching and slightly exceeding 1.4 - without it doing the same thing.
 
do the simulations yourself guys... if the simulations even count... there's no way to know for sure they're the same as actual dive calculations. You'll never see a recall based on a simulation dive.

Fact is, a dive to 107' which is the MOD of 32% according to the "suunto tables" ,which are all that matters when talking about a suunto computer, as my pictures show will not lock your dive computer out at 15 or even 20 minutes. There is no acceleration during that dive. The OLF rate is higher througout the dive due to the fact that the entire dive, almost to the NDL is at the MOD. MOD generally does not mean that you should spend the entire dive at that MOD. Thats just stupid. Who would ever do that? No one except a guy that loves to cry about every LDS and dive manufacturer that he has every bought anything from and me that just wants him to tell the whole truth. The whole truth is that the suunto cobra and vyper never lock up in error mode as Genesis has stated several times and never give any indication that the diver should shoot to the surface.

The basis for his claim that these dive computers are "severly flawed" is safety. There is absolutely no safety concern there or the CPSC and/or suunto would address it. There is no acceleration. The computer does not blind side you. A dive that for its entire duration is dead on the MOD will show OLF values at a higher rate, but there is no acceleration. Thats whats called safety and conservatism. From the time you hit 107' til the end of the dive (15 minutes at that depth are the given), the rate of increase on the OLF graph remains constant and gives the diver plenty of forewarning when to end the dive.

Can you dispute that Karl???? Concentrate on just that for a moment... the basis of your claims that the computer is unsafe. If the dive computer was based on the SSI tables... don't you think they would say so? They don't because it isn't and so you can't compare the two... all you can say is what we all already know... The suunto cobra and vyper and mosquito (I guess you'll buy one of those and complain as well) are all more conservative than most tables when and only when you strictly compare the NDL and erroneously compare the OLF and the CNS O2 clock... those two are not the same as I've stated numerous times in this thread and you keep ignoring.

If this problem is real and is really a safety concern... wouldn't that be a big deal since there are probably hundreds of thousands of these models on the market? Thats basically almost all dive computers suunto has put out in the last few years. That could shut suunto down, right? The CPSC would love to jump on that one so why haven't we heard anything? Would suunto ignore such a big deal? Wouldn't they know that something like that can't be kept a secret? Call the papers... call the television shows Karl. You could be the one to break the story. Look at all the talk about the uwatec computers and there weren't all that many with the problem as compared to this were there? Funny how you dropped the crusade for a month.

There's a whole lot of suunto cobra and vyper owners on this board and none seem to be putting their two cents in because they know its not a problem, its just how their dive computer is and how you are.

You sure have a pile... but its not evidence. You have simulation dives which will never count in the real world and they aren't conclusive. The info you have from real dives is a mess at best and had nothing to do with your complaint about 32% to 107' (MOD @1.4 po2) and also proved nothing. Scubaboard doesn't count in the real world... no matter who believes you here, you have to have actual documented proof in the real world. Has the CPSC even contacted you at all?

If anyone missed my pictures and want to see them, check it out

Suunto Cobra Sim dives
 
on any given day during normal diving profiles (multilevel, slow descent and ascent), a suunto cobra or vyper will give you much more bottom time and more CNS clock time that you could ever experience with any dive table

In using a dive table, you must figure the max depth of the dive for the entire duration of the dive even if you didn't stay at that max depth for the entire dive. That eats up the CNS clock quite fast. A dive to 100' that only averages 50' will have to be figured as if you stayed at 100' feet the entire duration of the dive and thus eat up twice as much CNS clock time. In the same way Karl says the cobra and vyper are flawed, we could also say that every dive table is flawed and unsafe because of how it is used. But thats just the conservatism built into the tables now isn't it. Anyone see the difference here and why we can't blindly compare dive computers to tables? Would you rather the cobra work just like a table Karl? Thats what it sounds like to me. Just go right along with the tables you say are so much more liberal than the suunto figuring only the max depth and total bottom time. See what you get out of that.
 
and while you're at it, quit being such a shill (never mind selling nickel O-rings at a 1,000% mark-up! If anyone would like a supplier who will sell in small quantities and not mark them up, PM me - its not me, by the way - I'll just send you to the industrial supplier where I get them from.)

I've answered your "objections" Jamie. I have never said the computer would "lock you out", or go into hard error mode.

Once again, you're lying.

First, you claimed (in the other thread) that the COBRA did not show the same gross overstatement of CNS O2 load that I had documented in the Vyper while in SIMDIVE mode.

So I got a COBRA. And proved that indeed, it does. And called you on it.

Instead of admitting that you either were mistaken or intentionally lied, you have now attempted to take the thread on a tangent and launched a series of vitriolic personal attacks.

I have reported it to the CPSC. They have contacted me. As you would know if you had ever dealt with them before (I have), they do not release nor discuss the STATUS of any pending investigations (or, for that matter, if indeed there are any!)

The Uwatec recall required SEVERAL YEARS to initiate from the time the first complaints were filed. Why? They're a government agency and have a LOT of garbage out there in the marketplace to investigate.

Since then you have continued onward with your personal attacks, even though I have posted both a profile in which I intentionally provoked the bad behavior in a Vyper (since your FIRST claim was that this was an anomaly in SIM mode and didn't really happen when diving) and now have posted a dive profile off my Vytec, which I dove just this last Saturday, showing that it does not have the same problem even though I exceeded the 1.4 PO2 threshold (by its computation) for most of the bottom time. In response to THAT profile you claimed that I had turned down the conservatism in the Vytec - more (false and baseless) accusations, which I responded to with the page from my logbook that shows that indeed, the computer is operating in the "normal" mode - exactly identical to where the Vyper and Cobra I own are.

The fact remains that those computers have a flaw in their OTU computation. It is well-recognized by a significant percentage of the diving population who owns them - I've seen reports of this misbehavior on several other boards, not just here.

This IS a safety issue, as this miscomputation of the OTU limits means that for all intents and purposes the CNS "clock" tracking by the computer is useless. The result of this could be either (1) a bad decision made by a diver in the water, if they believed the bad information they were presented, possibly leading to taking a DCS hit or (2) intentionally ignoring the known erroneous computer information, and therefore exposing oneself to the risk of a REAL O2 hit (fairly unlikely in light recreational use, but quite possible in heavy use such as one might encounter on a liveaboard trip.)
 
In using a dive table, you must figure the max depth of the dive for the entire duration of the dive even if you didn't stay at that max depth for the entire dive. That eats up the CNS clock quite fast. A dive to 100' that only averages 50' will have to be figured as if you stayed at 100' feet the entire duration of the dive and thus eat up twice as much CNS clock time.

No it doesn't.

As I pointed out, the 107' dive for 20 minutes consumes 11% of the CNS clock time according to the SSI tables (PO2 = 1.4). The same dive for 25 minutes consumes 14% of the CNS clock time.

The Vyper or Cobra consider such a dive to have consumed ONE HUNDRED PERECENT of the allowed CNS clock time.

I've already pointed this out Jamie - you simply refuse to read.
 
How do you know how much I payed for my o-rings? Do you have my reciepts? You can buy cheap o-rings for a nickel a piece. You can also buy a car for $300 bucks. would you like the distributor's name I got them from? I only listed them because I had more than I needed. What does that have to do with this thread Krazy Karl? Do you see any o rings for sale on my site? I don't see them if they're there...

You're saying that a dive to 100' feet but averaging 50' doesn't use up as much or more CNS time on the table as it does on the cobra? Do a dive to 107' for 10 minutes and then ascent to 30 feet for 50 minutes. Use those darned tables and you'll have to figure 109' for 60 minutes, using up 33% of the SSI CNS clock. Hey, you've blown the tables NDL out of the water so you can't use it anymore that day. Dive day should be done... Not if you're using a computer.

How about a dive to 100' for 5 minutes and the remainder of the
dive at 35' for a total bottom time of 50 minutes. Using the SSI table, you have to figure the dive as a dive to 109'. First of all, the table won't allow such a dive. So you won't be able to use the table to figure any more dives for the day. Second, you've used up 28% of your CNS clock but it doesn't matter because you can't do anymore dives that day using the table. Any dive you do that day, you do it not knowing exactly how safe you are. Dive day should be done. Not if you're using a computer.

Should the tables be recalled? They'll leave you high and dry sometimes even if the CNS clock isn't used up. How reliable are the tables now? CNS clock isn't the only consideration when using the tables.

Karl's table dive day... (using SSI tables of course, 32% nitrox)

Dive one is to 99' for 25 minutes: 14% CNS clock, G group;two hour SI, D group now.

Dive two is to 64' for 26 mins (NDL): 11% CNS clock, H group; 2 hour SI, E group now.

Dive three is to 52' for 32 mins: 10% CNS clock, I group; two hour SI, F group now.

Totals: 35% CNS clock, dove to the NDL on each dive, 1 hr 23min bottom time, 6 hours of surface intervals. You've been on the water for at least 8 hours now, but you've only used 35 % of the CNS clock and you've only got in an hour and a half bottom time? Those tables really are awesome aren't they. So liberal. Does thier CNS clock figures really amount to much? You want the tables CNS figures and the computer's NDLs, right? You think I couldnt' get that much bottom time with my cobra doing those dives? Thats what its all about isn't it?

on any given day during normal diving profiles (multilevel, slow descent and ascent), a suunto cobra or vyper will give you much more bottom time and more CNS clock time that you could ever experience with any dive table using the dive table and the dive computer correcty and per its respective instructions.

I'll put that at the end so hopefully you won't miss it or ignore it again.
 
Back to the points at hand; I am not about to let you off the hook on this nor succumb to your attempted sock-puppet games:

First, you said the Vyper/Cobra didn't do what I claimed it did.

I proved that it did.

Then you said that the COBRA didn't do it.

I then proved that indeed, it did (also), by acquiring one and taking pictures of it doing so.

You also said that what I saw was an "anomaly" in the SIM mode that did not happen on a real dive.

I took the Vyper on a real dive and showed that indeed, it does it on a real dive too.

Then you said that the bottom line was that "Suuntos are famously conservative, and you simply shouldn't ever go over what it thinks is a PO2 of 1.4, or it will do this."

I then said I had a profile from this last Saturday, on my Vytec, which has me over an indicated 1.4 PO2 for 15 minutes, and I have accumulated only 20% CNS loading - not the 100% that I would have had on the Vyper or Cobra - on the computer.

You then accused me of attenuating the RGBM setting on the Vytec to accomplish this dive, effectively shutting off the conservatism.

I then posted the profile and the computer settings from my log, proving that once again you are lying; I am diving the Vytec with its default conservatism - the same conservatism that the Cobra and Vyper have out of the box.

Now you claim that if I do a dive to 137' as I did on Saturday, consuming not only all my NDL time but going (intentionally) into deco, I "won't be donig any more diving that day", with the implication being that I simply can't do the kind of diving I do.

Here's my second profile of the same day Jamie - again, you're wrong - again, this was done on my Vytec. As you can see, I had plenty of NDL on that dive left - I terminated it due to there being no fish or lobster around to get for dinner, not running out of either gas or time.
grayton-1.jpg


And oh, by the way, both of those dives are pretty square profiles. Using V-planner, which is a "table generator", and your claim that I "can't" do those dives using tables, I generated the following:

V-Planner 3.20 by R. Hemingway, VPM code by Erik C. Baker.

Decompression model: VPM-B

DIVE PLAN #1
Surface interval = 2 day 0 hr 0 min.
Altitude = 0ft
Conservatism = + 2

Dec to 140ft (2) on Nitrox 28.0, 50ft/min descent.
Level 140ft 12:12 (15) on Nitrox 28.0, 1.47 ppO2, 125ft EAD
Asc to 40ft (18) on Nitrox 28.0, -30ft/min ascent.
Stop at 40ft 0:40 (19) on Nitrox 28.0, 0.62 ppO2, 34ft EAD
Stop at 30ft 2:00 (21) on Nitrox 28.0, 0.53 ppO2, 24ft EAD
Stop at 20ft 1:00 (22) on Nitrox 28.0, 0.45 ppO2, 15ft EAD
Stop at 15ft 7:00 (29) on Nitrox 28.0, 0.41 ppO2, 11ft EAD
Asc to sfc. (29) on Nitrox 28.0, -30ft/min ascent.

Off gassing starts at 77.6 ft

OTU's this dive: 28
CNS Total: 11.7%

70.3 cu ft Nitrox 28.0
70.3 cu ft TOTAL


DIVE PLAN #2
Surface interval = 0 day 2 hr 55 min.
Altitude = 0ft
Conservatism = + 2

Dec to 87ft (1) on Nitrox 30.0, 50ft/min descent.
Level 87ft 23:16 (25) on Nitrox 30.0, 1.09 ppO2, 73ft EAD
Asc to 20ft (27) on Nitrox 30.0, -30ft/min ascent.
Asc to 15ft (27) on Nitrox 30.0, -30ft/min ascent.
Stop at 15ft 1:36 (29) on Nitrox 30.0, 0.44 ppO2, 10ft EAD
Asc to sfc. (29) on Nitrox 30.0, -30ft/min ascent.

Off gassing starts at 50.5 ft

OTU's this dive: 29
CNS Total: 13.3%

68.2 cu ft Nitrox 30.0
68.2 cu ft TOTAL


DIVE PLAN COMPLETE
Once again, you're wrong. There is no mandatory deco stop on the second dive, as you can see, beyond the 1:36 minute stop at 15 feet (which we would call a "safety stop" in the recreational world.) The total CNS exposure for BOTH dives is 13.3%. Both the Vyper and Cobra would have generated roughly-the-same deco profiles (if you dive stops the way I do anyway), but both would have toxed me horribly on the first dive and probably still been toxed out when I went in the water for the second.

Jamei - you have continually, in this and the other thread, lied, pervaricated, refused to own up to what were either mistakes or intentional falsehoods on your part, and on top of it have continued to try to deflect attention from me calling you on all of it. There is nothing particularly aggressive about either dive, especially given that my ACTUAL time over PO2 of 1.4 was momentary (that is, ignoring the Suunto conservatism - if you look at the first profile, you will see a short excursion below an ACTUAL PO2 of 1.4 - which was done to unstick the anchor at the end of the dive.)

The bottom line: The Cobra and Vyper's CNS computation is BROKEN for PO2s that approach or exceed 1.4; it is NOT, however, common to ALL Suunto computers, as is proven by my Vytec.
 
exactly what I thought, you completely ignored everything in my post.

You have proved not a single thing. You have shown no dives with the vyper showing the problem. You have one dive with a rediculous setting (47% O2 and you went over the MOD by 20' or more) That isn't 32% to 107' is it.

My pictures are much more conclusive than yours. There's nothing "broken", its just how the algorythm works. Everyone knows the vytec is newer and more liberal. You can't compare it to the vyper and cobra because its a different computer with different settings.

You can't be a man and comment on my post on the those tables you keep babbling about. Is it ok for you to change the subject but me not to? You are the fool that keeps saying the tables are so much better than the cobra. What do you have to say to that? Not a damn thing I bet because theres nothing you can say. You're posts are baseless. No matter how many times you say that you've provided so much evidence, the truth is you just don't have anything thats worth seeing. You make it out that you have mounds of evidence. You say the cobra "errored out" or "toxed out" but I clearly show that in a simulation dive that such a dive is within the green of the OLF. Tox out makes folks think that its locked up in the red. You know what your words mean to most people. That's just being a weasel. I think you're the most disliked and ridiculed person on scubaboard. Do you even realize why?

Do I argue with everyone about everything? No, just you on this point. You argue about LDSs, manufacturers, policies, just everything. You're a compulsive trouble maker. You want to cause trouble everywhere you go. You never have any hard evidence of anything. You brag about everything (you're boat... your career, your money).

You never answered my challenge... flip the bill for a 64mb memory stick and I'll provide video of a full dive simulation at 107' for 15 minutes on my website for everyone to see. Showing that the mix is 32% and that the 107' bottom time is maintained and that a normal, slow ascent is maintained and that the only alarms you will hear is when the air gets low. I'll provide another video of the same dive up until 2 minutes are left on the NDL for a safe ascent.
 

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