mCCR or eCCR for video filming

silent running · 14th January 2008, 18:09

Quote: (Originally Posted by Dutchy)

There are a lot of failure modes and you have no idea which ones are handled and which ones are not. A completely separate HUD is IMHO an asset.

Yes a HUD is an asset, even one which is not completely independent. In my case, I have a completely independent 2dry for cross checking and very simple sp only electronics w/HUD. Simple means less failure modes, which means I'm comfortable trusting my pulsing HUD for a few minutes if I have to.

Quote: (Originally Posted by Dutchy)

The idea about it is that when it kicks in you know it is DEAD WRONG (as opposed to an eCCR where a solenoid firing is a normal thing). So basically it it of similar complexity as eCCR but it has a major advantage.

Sure, I understand the appeal of a hybrid E/M, but having to calibrate 2 sets of electronics/displays, and check your IP and CMF flow rate, is more complexity than any current ECCR I know of.

Quote: (Originally Posted by Dutchy)

The solenoid firing (better even together with a buzzer) is a true alarm. Meaning you have to stop filming (or whatever) and start diving. The solenoid firing is an alarm NOT a reassurance. Hence I expect the empty tank or clogged orifice to be caught.
In short I beleive in relying on electronics by exception as opposed to relying on it by default.

Yes, but either of these faults will also be caught by any unit with a HUD, unless your electronics do not have any warning of hanging-like a pulsing HUD-and freeze at exactly the same moment as the clogged orifice/running out of O2.

jdicediver · 14th January 2008, 18:28

Did a short piece of video for a Discovery Channel Production mid December under the ice, pretty shallow though. No concerns using a COPIS Meg, just inject 02 and go, go, go. Also, at -5C air temp and +2C water temp, I did about 10 - 15 mins prebreathing with FRESH 'Sorb. A HUD would be a great idea IMHO. My 15 minutes of fame; let you know when the production airs sometime next fall!

14th January 2008, 18:09	#41 (permalink)
silent running Mature mouth breather Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: Jun 2005 Location: U.S.A. Brooklyn, New York Posts: 1,832	Re: mCCR or eCCR for video filming Quote: (Originally Posted by Dutchy) There are a lot of failure modes and you have no idea which ones are handled and which ones are not. A completely separate HUD is IMHO an asset. Yes a HUD is an asset, even one which is not completely independent. In my case, I have a completely independent 2dry for cross checking and very simple sp only electronics w/HUD. Simple means less failure modes, which means I'm comfortable trusting my pulsing HUD for a few minutes if I have to. Quote: (Originally Posted by Dutchy) The idea about it is that when it kicks in you know it is DEAD WRONG (as opposed to an eCCR where a solenoid firing is a normal thing). So basically it it of similar complexity as eCCR but it has a major advantage. Sure, I understand the appeal of a hybrid E/M, but having to calibrate 2 sets of electronics/displays, and check your IP and CMF flow rate, is more complexity than any current ECCR I know of. Quote: (Originally Posted by Dutchy) The solenoid firing (better even together with a buzzer) is a true alarm. Meaning you have to stop filming (or whatever) and start diving. The solenoid firing is an alarm NOT a reassurance. Hence I expect the empty tank or clogged orifice to be caught. In short I beleive in relying on electronics by exception as opposed to relying on it by default. Yes, but either of these faults will also be caught by any unit with a HUD, unless your electronics do not have any warning of hanging-like a pulsing HUD-and freeze at exactly the same moment as the clogged orifice/running out of O2. Last edited by silent running : 14th January 2008 at 18:12.
(Online)

14th January 2008, 18:28	#42 (permalink)
jdicediver John Harcus Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jun 2006 Location: Calgary, Alberta Posts: 258	Re: mCCR or eCCR for video filming Did a short piece of video for a Discovery Channel Production mid December under the ice, pretty shallow though. No concerns using a COPIS Meg, just inject 02 and go, go, go. Also, at -5C air temp and +2C water temp, I did about 10 - 15 mins prebreathing with FRESH 'Sorb. A HUD would be a great idea IMHO. My 15 minutes of fame; let you know when the production airs sometime next fall! __________________ Regards; "Some people shouldn't dive...others shouldn't even get wet".
(Offline)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode