Is there anyone diving tiny doubles? Need some input.

[tbone1004]

I ended up with a set of the 50’s. How much lead are you using with your set up like this Chris?

buoyancy characteristics are almost identical to the 120's you have. Since a drysuit is very personal in terms of how much lead you need based on your personal comfort level of suit volume, provided everything else is the same, you shouldn't have to change anything between your 50's and 120's.

 

[Chris H]

I ended up with a set of the 50’s. How much lead are you using with your set up like this Chris?

I use a standard SS backplate and I think I have 3lbs in a tail weight pouch. I usually have two battery canisters, because I really like my heated vest. As others have mentioned, on paper they shouldn’t need anything different than with the 120s.

 

[Storker]

Most places other than the USA cylinder sizes are in litres, which is the 'water capacity' (empty cylinder volume). The majority of the cylinders would also be considered high pressure (232bar - 3400psi). I struggle with american dive cylinders and volumes, so I always work with what I know.

A number of the women in my club have dived either 7litre twins or 10litre twins. Which they find more comfortable in terms of weight, especially those of a more slight build.

Interesting. The most common small twinsets I see around, are D8.5x232. There are also quite a few D7x300, and the occasional D6x300. They's usually treated as a single tank rig with increased capacity and a COG comfortably close to the user's back, not for redundancy, and I doubt if many of the users actually train manifold operation and will be able to isolate the tanks in case of a freeflow.

The nominal capacity of a D7x300 set is somewhat larger than that of a D8.5x232 set, but due to the non-ideal behavior of air as we pass 230-250 bar, they have effectively the same capacity. We can also find single 12x300s, which provide the same amount of gas as a D6x300, but the tank is so long that it's best suited for those over average height.

And no, I haven't seen any issues with getting 300 bar fills. All clubs I've visited, and all fill centers I've used so far provide both 200/232 bar fills and 300 bar fills. I do, however, understand why those who PP blend stick to 232 bar...

 

[lucca brassi]

BtS Doppel 8,5l breit 230bar - Konkav

these RULZ !

(these are on bottom lower heavy cca 1,5kg and they compensate doubles 1 stages and manifold to neutral - ideal for diving with minimum suit and no weights (coast))

 

[Magnus Lundstedt]

Interesting. The most common small twinsets I see around, are D8.5x232. There are also quite a few D7x300, and the occasional D6x300. They's usually treated as a single tank rig with increased capacity and a COG comfortably close to the user's back, not for redundancy, and I doubt if many of the users actually train manifold operation and will be able to isolate the tanks in case of a freeflow.

I seen many ppl around here using old interspiro/AGA 324 (2 X 4l @ 300Bar) it looks like a nice little pack, They do not have the possibility to use redundant regs so they just treat it as a single tank.

 

[Cyborg Pirate]

Just a report update. Anyone looking to get into a set of tiny doubles..... DO IT!!! I now have 26 dives in my 50’s in just under a month. Absolutely awesome!!! Easily filled tranfilling between dives. Warning tho.... I have been diving them so much I ended up getting my own compressor. I got the Max-air 35. Now I can do my own fills at home (I live on the lake). So I fill my own tanks during surface intervals. Getting a dive in almost every morning before work. Some days 2-3 dives in them.

Absolutely worth every penny invested for the tiny doubles. Using the 120’s for tech dives and the mini’s for rec dives. Far better then diving singles. Just my opinion. Thank you all for your help in the decision making process and advice on setting up the mini’s

 

[ajtoady]

I set up a pair of Faber LP 50's last year in a twinset. I use them in an independent configuration due to shoulder problems. They are quite sweet and compared to the larger tanks, half the weight. Pump them up a bit and you are carrying about 140 cu ft. Enough for a comfortable dive. I also will use them in a side mount setup, just as nice. I dive solo mostly due to work travel and dive when I can, so the redundancy of two tanks, two regs, firsts and seconds, gives me a little security. But thats my $.05. (adjusted for inflation)

 

[Cyborg Pirate]

I set up a pair of Faber LP 50's last year in a twinset. I use them in an independent configuration due to shoulder problems. They are quite sweet and compared to the larger tanks, half the weight. Pump them up a bit and you are carrying about 140 cu ft. Enough for a comfortable dive. I also will use them in a side mount setup, just as nice. I dive solo mostly due to work travel and dive when I can, so the redundancy of two tanks, two regs, firsts and seconds, gives me a little security. But thats my $.05. (adjusted for inflation)

I agree! That’s why I really wanted the doubles up 50’s. I dive solo a lot. Really want the redundancy and not have to lug my pony with me on every dive.

 

[Compressor]

@Cyborg Pirate : I do have a pair of LP50s and have did not change any of my weights compared to wearing a LP85. I'm 170 lbs and 5'10". I wear 2 lbs with a 7mm suit; SS back plate. Hope this helps.

My biggest problem: Choose between LP50s or single LP85. So far I've solved this by diving both.

 

[Cyborg Pirate]

@Cyborg Pirate : I do have a pair of LP50s and have did not change any of my weights compared to wearing a LP85. I'm 170 lbs and 5'10". I wear 2 lbs with a 7mm suit; SS back plate. Hope this helps.

My biggest problem: Choose between LP50s or single LP85. So far I've solved this by diving both.

I am using an AL backplate with this set up. So I need 6lbs with my drysuit. in another couple weeks I will be in a 7mm wet. I am assuming I will only need 2lbs if that.