One or Two first stages?

[lucca brassi]

For short dives try Euro cylinder 2 x 8,5 l / 230 bar concave . The best thing I have EVER worn under water .

https://www.tec-divesysteme.com/epages/61085486.sf/de_DE/?ObjectPath=/Shops/61085486/Products/"DK 8977"/SubProducts/"DK 8977-0001"

that combination is very comfort on surface , very good buoyncy ratio ( full /empty) , longer cylinders and bottom heavy , enough air to breathe ....

Because of my group I have to take double Euro cylinder 2 x 12 l / 230 bar concave but still great because are bottom heavy.

Mares/ Faber tanks are top heavy and bottle is relative short make hell under water with some heavy regs or double valves. Faber also have more than teen combination of volume/size/weight
which is ******** !
UK Scuba - Cylinder Buoyancy Calculation

 

[Angelo Farina]

For short dives try Euro cylinder 2 x 8,5 l / 230 bar concave . The best thing I have EVER worn under water .
https://www.tec-divesysteme.com/epages/61085486.sf/de_DE/?ObjectPath=/Shops/61085486/Products/"DK 8977"/SubProducts/"DK 8977-0001"

Really a nice setup! It's a pity that it costs a lot to purchase (689 €) and to maintain (hydro cost x2 compared to a single).
If I win some lottery, I would buy two sets (one for me, one for my wife) and we sell our obsolete Aralu twins...

 

[lucca brassi]

You have to look on local diving sell pages and you got quite fresh set for around 400€ . Post from Germany is 45€ for doubles ;-)

Taucherflohmarkt, Tauchausrüstung und Tauchsport | Tauchers Pinnwand (search : tauchflache ) (be carefull NOT 300 bars because are too heavy !!!)

Potapljanje (search : jeklenke)
jeklenke - Iskanje na bolha.com

https://www.ebay.de/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313.TR1.TRC0.A0.H0.Xdoppel+8,5.TRS0&_nkw=doppel+8,5&_sacat=0 very nice results ! ;-)

PS : As I see almost no one have rings in correct position like :

PSS: very interesting study :'' Environmental technical Physics ''

 

[Storker]

For short dives try Euro cylinder 2 x 8,5 l / 230 bar concave . The best thing I have EVER worn under water

They're quite popular up here for NDL(-ish) diving. I see quite a few of them on club outings.

 

[Angelo Farina]

PSS: very interesting study :'' Environmental technical Physics ''

So you probably will be interested to this recent paper:
https://asa.scitation.org/doi/abs/10.1121/2.0001051

I contributed to a study preliminary to this:
http://www.angelofarina.it/Public/Papers/249-JEMBE-2010.pdf

 

[lucca brassi]

No , I work on testing of high power BLDC for transportation / automotive components laboratory

Electronics and Drives but I like tor read environmental problem studies which includes technical analysis and solutions .

something like : Venetian water barrier

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PS : for me as tech like to monitor data from our buoy
OCEANOGRAFSKA BOJA (switch to italian ) , we have also
mobile app https://play.google.com/store/apps/details?id=com.peterv.mbpp&hl=sl
but we don have noise data but should be very usefull , because it is on the way to Koper port
and we have a lot of dolphins which are acustic sensitive
MORIGENOS