Here are some photos of my JJ rig which Kieran Hatton and myself have been working on recently
We've both agreed to keep it as close to OC as possible as we both still dive an OC rig, so pretty much everything has been built with this in mind hence the clean and tidy appearance
At the moment the rig has 1 x 7 litre of bottom bailout gas feeding the BOV and traditional long hose which can be used by either the CCR diver or buddy, whichever is more useful. Personally i will go for the long hose as it breathes better than the bOV and at depth under stress I reckon this is a better option
We both agree that the BOV hose can be routed better with the Mk 25 first stages and this will be improved next time (fridays dive)
Then the other 7 litre is 02 and we will be making a quick connect system allowing you to plumb the manual 02 feed hose into the BOV when you reach 6m so you can breathe all that lovely 02 on OC
So for 30-40m diving you are self sufficient with just the back gas, assuming you plan your dives properly and fill the 7's before each dive, and then as you go deeper you just add more stages to suit. As most of our diving is 80m and shallower on the South Coast we estimate a maximum addition of 2 stages, one which will be a eanx 50 and the other will be an intermediate Trimix, something like 30/30 to avoid staying too long on the back mounted 7 litre.
With this config there is no need for a yellow bag as you are 100% self sufficient with what you're carrying, and this was what we both wanted to achieve
I didn't want to mount anything else on the back of the rig as I feel it's a huge snag hazard, plus if you decide to use 8.5 or 12 litre cylinders then it just gets ridiculous. Having the canistor torch mounted on the waistband is fine and the suyit inflation cylinder doesn't seem to affect WOB at all.
If you want you can plumb in the stages through the GCS into the BOV but personally I'd rather be off the loop on a reg so I can control loop volume during ascent
It's not perfect I know, but it's bloody lovely not having stages for 30-40m dives and for deeper dives it ticks all my own personal boxes, so I'm happy.
Cheers
Rich
We've both agreed to keep it as close to OC as possible as we both still dive an OC rig, so pretty much everything has been built with this in mind hence the clean and tidy appearance
At the moment the rig has 1 x 7 litre of bottom bailout gas feeding the BOV and traditional long hose which can be used by either the CCR diver or buddy, whichever is more useful. Personally i will go for the long hose as it breathes better than the bOV and at depth under stress I reckon this is a better option
We both agree that the BOV hose can be routed better with the Mk 25 first stages and this will be improved next time (fridays dive)
Then the other 7 litre is 02 and we will be making a quick connect system allowing you to plumb the manual 02 feed hose into the BOV when you reach 6m so you can breathe all that lovely 02 on OC
So for 30-40m diving you are self sufficient with just the back gas, assuming you plan your dives properly and fill the 7's before each dive, and then as you go deeper you just add more stages to suit. As most of our diving is 80m and shallower on the South Coast we estimate a maximum addition of 2 stages, one which will be a eanx 50 and the other will be an intermediate Trimix, something like 30/30 to avoid staying too long on the back mounted 7 litre.
With this config there is no need for a yellow bag as you are 100% self sufficient with what you're carrying, and this was what we both wanted to achieve
I didn't want to mount anything else on the back of the rig as I feel it's a huge snag hazard, plus if you decide to use 8.5 or 12 litre cylinders then it just gets ridiculous. Having the canistor torch mounted on the waistband is fine and the suyit inflation cylinder doesn't seem to affect WOB at all.
If you want you can plumb in the stages through the GCS into the BOV but personally I'd rather be off the loop on a reg so I can control loop volume during ascent
It's not perfect I know, but it's bloody lovely not having stages for 30-40m dives and for deeper dives it ticks all my own personal boxes, so I'm happy.
Cheers
Rich