Megaladon Versus Optima Fx

brandonmc · 25th January 2008, 20:20

Quote: (Originally Posted by JCdesign97)

Of course I agree and love the fact that the HH will A) fire the solenoid even in OC mode if it sees the PO2 drop below 0.19 and B) the DIVA will be going crazy trying to alert you to same. But just playing devil's advocate, even this can be defeated pretty easily - how many minutes do you have your 'sleep mode' set for? Someone I know (initials Yours Truly) once started his pre-dive, got sidetracked and didn't remember shutting off his tanks during the surface interval, finished his checks and then walked down to the water. Like Stuart, didn't feel right putting on his fins standing in 3 feet of water and immediately looked to find that his handsets had gone back to sleep; turned them back on and spit out the DSV as soon as he saw PO2s below 0.19, felt the alarm and simultaneously wondered why in the hell the solenoid wasn't firing - then remembered the valves ...

So just to keep myself in Richie and Brandon's sane camp, the moral of the story is yes, every tool you can add to the arsenal is great ... as long as the tool doing the diving doesn't manage to ignore or defeat them!

Dear YT,

Just for clarification... If the HH handsets go to sleep the DIVA will not vibrate/alarm? Will the controller still be "awake" even if the handset display is sleeping or is the whole thing asleep? IE does this also mean it will not try to inject O2 if it falls below 0.21?

brandonmc · 25th January 2008, 20:28

Quote: (Originally Posted by JCdesign97)

Not with the empty can in your basement and the head back at ISC, no I imagine it wouldn't ...

In the interest of fairness lest we not forget the empty Optima also sitting in the basement next to it

JCdesign97 · 25th January 2008, 21:58

Quote: (Originally Posted by brandonmc)

Dear YT,

Just for clarification... If the HH handsets go to sleep the DIVA will not vibrate/alarm? Will the controller still be "awake" even if the handset display is sleeping or is the whole thing asleep? IE does this also mean it will not try to inject O2 if it falls below 0.21?

If the handsets are out of dive mode, not seeing changing PO2 and are dry and reach their 'auto shutdown' time and go to sleep, then you can breath down the loop until your heart's content (or quite the opposite, in this case). Of course this is an obscure scenario would "never" happen on most dives because the wet contacts would activate them, hitting the buttons would activate them, etc. I was simply illustrating that even with those fail-safes, operator error can still come into play. As others have noted, nothing can be designed that is absolutely 100% foolproof ... or maybe I'm just an exceptional fool!!

Tienuts · 25th January 2008, 22:07

That's why on my pre-breath checklist, the second line is "activate handsets."

My auto shutdown is set to 30 minutes.

zmcave · 25th January 2008, 22:20

I am just wondering if Finni (who strated the thread) is beeing helped with all the competition Meg x Optima that is going on...

I guess he is probably looking for an Inspiration right now!

...

jiseson · 25th January 2008, 23:28

Quote: (Originally Posted by zmcave)

I am just wondering if Finni (who strated the thread) is beeing helped with all the competition Meg x Optima that is going on...

I guess he is probably looking for an Inspiration right now!

...

touche'

***caveseeker7*** · 25th January 2008, 23:34

Quote: (Originally Posted by zmcave)

I guess he is probably looking for an Inspiration right now!

...

Wouldn't suprise me

raises a question though:
With or without ExtendAir adapter kit?

jiseson · 25th January 2008, 23:36

Quote: (Originally Posted by caveseeker7)

Wouldn't suprise me

raises a question though:
With or without ExtendAir adapter kit?

zmcave · 25th January 2008, 23:46

Quote: (Originally Posted by caveseeker7)

Wouldn't suprise me

raises a question though:
With or without ExtendAir adapter kit?

hehehehehehehehe, thats green for you!

Dsix36 · 25th January 2008, 23:55

Quote: (Originally Posted by Tienuts)

Don,

I would say since the scrubber is a key part of each unit, an EAC vs Sorb discussion is very valid indeed. How many people have you heard on this board say - "The Optima wasn't an option cause you can't use sorb," or "I bought my Optima because of the EAC."

I would agree with this. Quick story - right after class, I was doing a dive with my girlfriend. Following a surface interval, I had finished my pre-breath checklist, and was on the loop on the boat. My girlfriend had a gear issue, and I began to help her. What I didn't realize, was my O2 valve had rolled off, and caused my PO2 to drop below .19. After a few minutes of me helping her, the HUD went off and scared the hell out of me. It vibrated my DSV, my mask - I felt my teeth chattering together.

The vibrating HUD is not foolproof, but you would have to be unconscious not to notice it go off. Minimum, it could give you the few seconds needed to bail out.

I am just saying this - enough about the scrubber, lets get to the many other reasons that an Optima is superior.

About the vibrating HUD - It is not nearly as noticeable at depth - not that I would have any experience with not monitoring for this to happen

.
OK, maybe once

25th January 2008, 20:20	#121 (permalink)
brandonmc is awesome Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Oct 2006 Location: Maryland Posts: 111	Re: Megaladon Versus Optima Fx Quote: (Originally Posted by JCdesign97) Of course I agree and love the fact that the HH will A) fire the solenoid even in OC mode if it sees the PO2 drop below 0.19 and B) the DIVA will be going crazy trying to alert you to same. But just playing devil's advocate, even this can be defeated pretty easily - how many minutes do you have your 'sleep mode' set for? Someone I know (initials Yours Truly) once started his pre-dive, got sidetracked and didn't remember shutting off his tanks during the surface interval, finished his checks and then walked down to the water. Like Stuart, didn't feel right putting on his fins standing in 3 feet of water and immediately looked to find that his handsets had gone back to sleep; turned them back on and spit out the DSV as soon as he saw PO2s below 0.19, felt the alarm and simultaneously wondered why in the hell the solenoid wasn't firing - then remembered the valves ... So just to keep myself in Richie and Brandon's sane camp, the moral of the story is yes, every tool you can add to the arsenal is great ... as long as the tool doing the diving doesn't manage to ignore or defeat them! Dear YT, Just for clarification... If the HH handsets go to sleep the DIVA will not vibrate/alarm? Will the controller still be "awake" even if the handset display is sleeping or is the whole thing asleep? IE does this also mean it will not try to inject O2 if it falls below 0.21? __________________ http://www.downtoolong.com/
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25th January 2008, 20:28	#122 (permalink)
brandonmc is awesome Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Oct 2006 Location: Maryland Posts: 111	Re: Megaladon Versus Optima Fx Quote: (Originally Posted by JCdesign97) Not with the empty can in your basement and the head back at ISC, no I imagine it wouldn't ... In the interest of fairness lest we not forget the empty Optima also sitting in the basement next to it __________________ http://www.downtoolong.com/
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25th January 2008, 21:58	#123 (permalink)
JCdesign97 RBW Member Current Rebreather/s: Optima Other Rebreather/s: Join Date: Mar 2007 Location: PA, USA Posts: 415	Re: Megaladon Versus Optima Fx Quote: (Originally Posted by brandonmc) Dear YT, Just for clarification... If the HH handsets go to sleep the DIVA will not vibrate/alarm? Will the controller still be "awake" even if the handset display is sleeping or is the whole thing asleep? IE does this also mean it will not try to inject O2 if it falls below 0.21? If the handsets are out of dive mode, not seeing changing PO2 and are dry and reach their 'auto shutdown' time and go to sleep, then you can breath down the loop until your heart's content (or quite the opposite, in this case). Of course this is an obscure scenario would "never" happen on most dives because the wet contacts would activate them, hitting the buttons would activate them, etc. I was simply illustrating that even with those fail-safes, operator error can still come into play. As others have noted, nothing can be designed that is absolutely 100% foolproof ... or maybe I'm just an exceptional fool!! __________________ Cheers, John Cogan
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25th January 2008, 22:07	#124 (permalink)
Tienuts Chief Prankster Current Rebreather/s: Optima Other Rebreather/s: Join Date: Sep 2007 Location: Fort Lauderdale Posts: 284	Re: Megaladon Versus Optima Fx That's why on my pre-breath checklist, the second line is "activate handsets." My auto shutdown is set to 30 minutes.
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25th January 2008, 22:20	#125 (permalink)
zmcave www.rebreather.com.br Current Rebreather/s: Optima Dolphin Other Rebreather/s: Optima Dolphin Join Date: Apr 2006 Location: Brazil Posts: 189	Re: Megaladon Versus Optima Fx I am just wondering if Finni (who strated the thread) is beeing helped with all the competition Meg x Optima that is going on... I guess he is probably looking for an Inspiration right now! ...
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25th January 2008, 23:28	#126 (permalink)
jiseson DSIX/O2PTIMA Current Rebreather/s: Optima Other Rebreather/s: Join Date: Jun 2006 Location: long island,ny Posts: 615	Re: Megaladon Versus Optima Fx Quote: (Originally Posted by zmcave) I am just wondering if Finni (who strated the thread) is beeing helped with all the competition Meg x Optima that is going on... I guess he is probably looking for an Inspiration right now! ... touche' __________________ *Jonathan D Iseson*
(Online)

25th January 2008, 23:34	#127 (permalink)
*caveseeker7* Who loves ya, baby Current Rebreather/s: Sport Kiss Other Rebreather/s: Prism Topaz Join Date: Jan 2005 Location: Too far from Neverland Posts: 5,535	Re: Megaladon Versus Optima Fx Quote: (Originally Posted by zmcave) I guess he is probably looking for an Inspiration right now! ... Wouldn't suprise me raises a question though: With or without ExtendAir adapter kit? __________________ Cheers Stefan "Political Correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.!"
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25th January 2008, 23:36	#128 (permalink)
jiseson DSIX/O2PTIMA Current Rebreather/s: Optima Other Rebreather/s: Join Date: Jun 2006 Location: long island,ny Posts: 615	Re: Megaladon Versus Optima Fx Quote: (Originally Posted by caveseeker7) Wouldn't suprise me raises a question though: With or without ExtendAir adapter kit? __________________ *Jonathan D Iseson*
(Online)

25th January 2008, 23:46	#129 (permalink)
zmcave www.rebreather.com.br Current Rebreather/s: Optima Dolphin Other Rebreather/s: Optima Dolphin Join Date: Apr 2006 Location: Brazil Posts: 189	Re: Megaladon Versus Optima Fx Quote: (Originally Posted by caveseeker7) Wouldn't suprise me raises a question though: With or without ExtendAir adapter kit? hehehehehehehehe, thats green for you!
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25th January 2008, 23:55	#130 (permalink)
Dsix36 Going Down? Current Rebreather/s: Optima Other Rebreather/s: Join Date: Aug 2007 Location: Deerfield Beach, Florida Posts: 1,147	Re: Megaladon Versus Optima Fx Quote: (Originally Posted by Tienuts) Don, I would say since the scrubber is a key part of each unit, an EAC vs Sorb discussion is very valid indeed. How many people have you heard on this board say - "The Optima wasn't an option cause you can't use sorb," or "I bought my Optima because of the EAC." I would agree with this. Quick story - right after class, I was doing a dive with my girlfriend. Following a surface interval, I had finished my pre-breath checklist, and was on the loop on the boat. My girlfriend had a gear issue, and I began to help her. What I didn't realize, was my O2 valve had rolled off, and caused my PO2 to drop below .19. After a few minutes of me helping her, the HUD went off and scared the hell out of me. It vibrated my DSV, my mask - I felt my teeth chattering together. The vibrating HUD is not foolproof, but you would have to be unconscious not to notice it go off. Minimum, it could give you the few seconds needed to bail out. I am just saying this - enough about the scrubber, lets get to the many other reasons that an Optima is superior. About the vibrating HUD - It is not nearly as noticeable at depth - not that I would have any experience with not monitoring for this to happen. OK, maybe once __________________ THE MORE THAT I LEARN, THE MORE THAT I STILL NEED TO LEARN!!!!!!
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