Larger Tanks for Dolphin

**Dave1w** · 14th February 2008, 09:08

From guys that have put a larger tank on the dolphin, what has been found to be a good compromise to give 2 good dives.

I know in the UK 10l with a H Valve is commonly used. Out here in Asia, there are a variety of ally cylinders, and I was thinking something dumpy of around 60 / 70 cuft.

Basically, I am hoping I can get a good compromise that will let my wife dive the dolphin alongside my SK on some 20 -35m dives, without having to go through too many fills etc.

So who has used what?

Cheers
Dave

**Freef** · 14th February 2008, 15:51

Things you need to consider are:

The weight of the tank-the Dolph won't manage twin 12's.

The dimensions of the tank-a 7L is way too long.

The length of the hoses-too short and the tank will be pushed a long way to the right.

Is the tank to be used for inflation and bailout-if so an H or Y valve is needed.

I posted a pic of my H valve as it is a bit unusual in set up, but I can't remember where. If you need to re posting here let me know.

Bosh · 14th February 2008, 16:04

I have bought 2 brandnew 5 liter/232 bar tanks, and a din connnection from Tecme, that means i now have normal DIN on the Dräger firststage.

The above solution is about the same price as a single new Dräger 5 liter tank.

Best regards

Bo

Divein · 14th February 2008, 18:18

Has anyone tried to mount a 7 litre on each side of a dolphin shell?

scubanimal · 14th February 2008, 19:30

I used a 50 cu ft (not sure how many liters that is) but running it on the 60% nozzle I easily had 3 dives from it. I was careful not to pick it up using the cloth handle of course, but diving wise it worked fine. I mounted in the normal 4ltr tank position. I also used a alum 45 cu ft. I tried several different sizes but those two were the best compromise.

grandizer52 · 14th February 2008, 19:43

I use to strap on a steel 100 and could get 3 days of diving out of it.

David Parker · 14th February 2008, 22:34

Before I converted mine I ran a 10L on mine. Weight was ok & I personaly would recomend it. I found runing a 36% through the 60% jet I was geting over 6 hours of diving from one fill & breathing arround 26%.

Hopes this helps
Rgds
Dave

Numpty diver · 15th February 2008, 07:53

Hi Dave
If you move the bailout bag to the left hand side of your unit, .. just undo string and re attach other side.
This will hold a 2 ltr pony and can be used for bcd and drægers spare air 2nd stage... guess you dont need suit inflation ( lucky devil )
A 7ltr ali will fit nicely now but will look a little off balance.
Once she gets into the water the Dolphin will sit perfect.
The air you save for bcd and the 7ltr , will give you two long dives.
Another little tip get some small fizzy pop bottles and fill them with lead shot, they fit snugley into the Drægers weight pockets. easy to carry and easy to dump.
They weigh 4 kilos each when full .
Dean

**Freef** · 15th February 2008, 16:47

Quote: (Originally Posted by Divein)

Has anyone tried to mount a 7 litre on each side of a dolphin shell?

You in your picture?

7's are quite long and may upset your trim. In the UK you need a rubber pad on the bottom of each one as they are likely to hit the wreck before you see it.

Divein · 15th February 2008, 19:30

No 2 3Ls and a 5L at the bottom! I always fancied the Buzz Lightyear look.

14th February 2008, 09:08	#1 (permalink)
Dave1w Born Again Diver! Current Rebreather/s: Sport Kiss Dolphin Ray Home Build Other Rebreather/s: Classic Kiss Dolphin Ray Home Build Join Date: Jan 2005 Location: China / UK Posts: 332	Larger Tanks for Dolphin From guys that have put a larger tank on the dolphin, what has been found to be a good compromise to give 2 good dives. I know in the UK 10l with a H Valve is commonly used. Out here in Asia, there are a variety of ally cylinders, and I was thinking something dumpy of around 60 / 70 cuft. Basically, I am hoping I can get a good compromise that will let my wife dive the dolphin alongside my SK on some 20 -35m dives, without having to go through too many fills etc. So who has used what? Cheers Dave __________________ This message may contain spelling mistakes as it was generated by an idiot. Last edited by Dave1w : 14th February 2008 at 09:11.
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14th February 2008, 15:51	#2 (permalink)
Freef Custom Title Disallowed! Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Jan 2006 Location: Land of the Freef, UK. Posts: 1,356	Re: Larger Tanks for Dolphin Things you need to consider are: The weight of the tank-the Dolph won't manage twin 12's. The dimensions of the tank-a 7L is way too long. The length of the hoses-too short and the tank will be pushed a long way to the right. Is the tank to be used for inflation and bailout-if so an H or Y valve is needed. I posted a pic of my H valve as it is a bit unusual in set up, but I can't remember where. If you need to re posting here let me know. __________________ David. Currently owner of two differently sized ankles.
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14th February 2008, 16:04	#3 (permalink)
Bosh New Member Current Rebreather/s: Dolphin Other Rebreather/s: Not Bought Yet Dolphin Join Date: Dec 2006 Location: Denmark Posts: 29	Re: Larger Tanks for Dolphin I have bought 2 brandnew 5 liter/232 bar tanks, and a din connnection from Tecme, that means i now have normal DIN on the Dräger firststage. The above solution is about the same price as a single new Dräger 5 liter tank. Best regards Bo
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14th February 2008, 18:18	#4 (permalink)
Divein Custom Title Allowed! Current Rebreather/s: Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: Jun 2006 Location: Yorkshire Posts: 101	Re: Larger Tanks for Dolphin Has anyone tried to mount a 7 litre on each side of a dolphin shell?
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14th February 2008, 19:30	#5 (permalink)
scubanimal New Member Current Rebreather/s: Inspiration Vision Optima Other Rebreather/s: Inspiration Classic Join Date: May 2006 Location: San Diego Posts: 82	Re: Larger Tanks for Dolphin I used a 50 cu ft (not sure how many liters that is) but running it on the 60% nozzle I easily had 3 dives from it. I was careful not to pick it up using the cloth handle of course, but diving wise it worked fine. I mounted in the normal 4ltr tank position. I also used a alum 45 cu ft. I tried several different sizes but those two were the best compromise.
(Online)

14th February 2008, 19:43	#6 (permalink)
grandizer52 Sport Kiss & Shearwater Current Rebreather/s: Sport Kiss Other CCR Home Build Other Rebreather/s: Not Bought Yet Sport Kiss Classic Kiss MK 15.X Other CCR Home Build Join Date: May 2006 Location: pearl city hawaii EARTH moving to Iscandar Posts: 254	Re: Larger Tanks for Dolphin I use to strap on a steel 100 and could get 3 days of diving out of it.
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14th February 2008, 22:34	#7 (permalink)
David Parker New Member Current Rebreather/s: Dolphin Home Build Other Rebreather/s: Not Bought Yet Dolphin Home Build Join Date: Jan 2006 Location: Essex Posts: 56	Re: Larger Tanks for Dolphin Before I converted mine I ran a 10L on mine. Weight was ok & I personaly would recomend it. I found runing a 36% through the 60% jet I was geting over 6 hours of diving from one fill & breathing arround 26%. Hopes this helps Rgds Dave __________________ Fuzzy & Fat
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15th February 2008, 07:53	#8 (permalink)
Numpty diver Custom Title Allowed! Current Rebreather/s: Other CCR Dolphin Ray Home Build Other Rebreather/s: Other CCR Dolphin Ray Home Build Join Date: Jul 2006 Location: Norway, Bergen Posts: 198	Re: Larger Tanks for Dolphin Hi Dave If you move the bailout bag to the left hand side of your unit, .. just undo string and re attach other side. This will hold a 2 ltr pony and can be used for bcd and drægers spare air 2nd stage... guess you dont need suit inflation ( lucky devil ) A 7ltr ali will fit nicely now but will look a little off balance. Once she gets into the water the Dolphin will sit perfect. The air you save for bcd and the 7ltr , will give you two long dives. Another little tip get some small fizzy pop bottles and fill them with lead shot, they fit snugley into the Drægers weight pockets. easy to carry and easy to dump. They weigh 4 kilos each when full . Dean
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15th February 2008, 16:47	#9 (permalink)
Freef Custom Title Disallowed! Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Jan 2006 Location: Land of the Freef, UK. Posts: 1,356	Re: Larger Tanks for Dolphin Quote: (Originally Posted by Divein) Has anyone tried to mount a 7 litre on each side of a dolphin shell? You in your picture? 7's are quite long and may upset your trim. In the UK you need a rubber pad on the bottom of each one as they are likely to hit the wreck before you see it. __________________ David. Currently owner of two differently sized ankles.
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15th February 2008, 19:30	#10 (permalink)
Divein Custom Title Allowed! Current Rebreather/s: Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: Jun 2006 Location: Yorkshire Posts: 101	Re: Larger Tanks for Dolphin No 2 3Ls and a 5L at the bottom! I always fancied the Buzz Lightyear look.
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