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Thanks for the replies. Sounds like the Alu tanks are recommended by most. I can probably rent a 7L steel from my local tec shop. So I might give that a try, just to see how it feels. I haven't seen a 7L Alu tank for sale anywhere (that I have a looked) in Australia. There is an 8L 230bar Alu...

The boats are fairly small, typically about 6-8m. and we are in the swell on the open ocean. Changing a wing between twinsets on the ocean is not something I will be attempting. To be honest, though, I haven't asked the operators what they think about someone diving side mount.

Thanks. The Alu 5.7L looks to be approx -1 to +1kg & 7.2kg dry The Steel 7L is -3 to -1 kg & 7.5kg dry If was needing more air then twin 11L side-mount would be the way to go. I would love to go twin-set, but it is not practical on the local boats I know of. The Alu 5.7L also seems to be the...

Thank you, this was what I was interested in hearing. I was wondering how a more negative cylinder would carry on one side. It sounds like it is noticeable. We don't have a 7L Alu tanks. The next size up for 207bar tanks is the 11L.

Steel tanks are 232bar, typically 220-225 once in the water. Alu tanks are 207bar, typically 200 in the water.

Ok, This is all off-topic. I can hold my decompression stops, buoyancy is good, weighting is good. I know how to do gas planning, and my planning is telling me I need either more gas or less time. When I was with the instructor, this is what we did, and I used a rented Alu 5.7L. This topic is...

The NDL is a good point, I haven't had a problem with this, as gas has always run out early. A more realistic profile than a square, might be: 30m for 10mins, 25m for 10 mins, 20m for 20mins, + safety stop, gives a 50min dive, which does not exceed NDL. My dive planning software puts me at...

Hi, I am trying to choose a tank to carry for some extra air, and looking for some advice. Background: my air consumption is on the high side, at about 24-25L/min. I have been diving with a 15L steel, and on some wreck dives to 25-30m I am always the first person to ascend, with the rest of...

Be careful with that assumption, staying deep for longer is not necessary more conservative. Going up too fast or too slow can be bad. You need to do the assent rate that is used in the decompression tables for that set of tables to be useful. Luckily dive computers can calculate your actual...