Doubles - How to learn?

[Meister481]

Hey JB! Ryan and myself just bought our doubles sets at the same time. We are taking a tech class so we need to get up to speed before the checkout dives. Mike R at the west side DSI store is a tech diver/instructor and can help you configure your setup, that's where I bought mine. They have DIve Rite tech products in stock. Call him and I bet he will help you out, he loves to teach and is great at it. Mike even has an extra set of doubles that he might loan out if you are really nice, or buy him some beer! Take a couple hours and head to the store on a Monday, Tuesday or Friday and you will have a great opportunity to pick his brain.

There are several club members who dive doubles exclusively. I bet Mike T will be more than willing to show you his setup and explain the mechanics before you jump in and play turtle a while. He will be at NSR this weekend if you are going(I will not-sinus infection). There are quite a few of us starting tech training here real soon so you are more than welcome to join us on our venture into tech diving. The dive club has been a great resource for all types of diving info. I'm hoping I will be able to make it to the meeting to finally meet you in person.

 

[Divin'Papaw]

Hey JB! Ryan and myself just bought our doubles sets at the same time. We are taking a tech class so we need to get up to speed before the checkout dives. Mike R at the west side DSI store is a tech diver/instructor and can help you configure your setup, that's where I bought mine. They have DIve Rite tech products in stock. Call him and I bet he will help you out, he loves to teach and is great at it. Mike even has an extra set of doubles that he might loan out if you are really nice, or buy him some beer! Take a couple hours and head to the store on a Monday, Tuesday or Friday and you will have a great opportunity to pick his brain.

There are several club members who dive doubles exclusively. I bet Mike T will be more than willing to show you his setup and explain the mechanics before you jump in and play turtle a while. He will be at NSR this weekend if you are going(I will not-sinus infection). There are quite a few of us starting tech training here real soon so you are more than welcome to join us on our venture into tech diving. The dive club has been a great resource for all types of diving info. I'm hoping I will be able to make it to the meeting to finally meet you in person.

Hey Jason. Outstanding! I didn't realize there we so many tech guys here locally. That is just awesome. Now I'm really looking forward to beginning to get more involved with the IDC (Indy Dive Club). I also have to get out to Diver's Supply West. I've only been to the eastside store. Now I recall having heard that they have more of a tech focus. Not quite sure yet if I have an interested in getting too much into tech, but I am quite interested in looking into moving in recreational doubles. Hope to see you on the 18th.

 

[dschulte]

What are some opinions on independent twin setups? I have just started diving a set, found them pretty easy to manage over the manifold option. My regulators and gauges are standard twin (DIR) setup. To the twins I added my two sling Deco tanks and I am ready for extended range.

I did research before committing to the independent setup over the traditional twins setup, did not find a definitive “best way”.

You can see some of the setups at http://www.quickdrawbracket.com/SETUPS.ivnu

 

[ppo2_diver]

You started this you know! The email exchange we had back in June has had me giving serious thought to doubling my AL80s instead of buying larger steels and a pony.

Glad to know that I can corrupt people. :14:

 

[ppo2_diver]

What are some opinions on independent twin setups?

Here are a couple reasons why indy twins are not normally accepted.

1) You have to have a SPG on both tanks. This is a potential second HP failure point that is eliminated with manifolded tanks.

2) How do you handle OOG emergencies? If the tank on your long hose is drained, you'll be donating a tank low on air. If the tank on your necklace is drained, YOU won't have much gas left if you have to donate your long hose.

3) #2 can be overcome by gas planning on a per tank basis, however, it leads to more complication and task loading during the dive than the benefits of indy twins provides (if any).

Personally, I can't think of any benefit to having them. But anyone can dive how they want.

 

[PerroneFord]

Personally, I can't think of any benefit to having them.

Really? I can. Sidemount!

 

[ppo2_diver]

Really? I can. Sidemount!

OK, you got me there. I had my DIR hat on.

 

[Hoosier]

OK, you got me there. I had my DIR hat on.

Yes, in your diving perspective, it won't be acceptable.

However, the most important use of an indepenent double is the gas management.
So, there is no chance to drain either tank. Each tank must have 1/3 air at the end of dives. Yes, you can still use the bugeed second and a long primary hose. You can give a long hose to your buddy anytime.

I don't think another HP port with a SPG is a big failure point. It is too much worst scenario in my opinion. Don't you ever think that the manifold can be more failure points than one additional HP port. Jim is also pointing out the double for the rec. diving in his previous post.

They are a few members who is using an independent set up in our board. Another big advantage on an independent double is that you can set it up anywhere in the world without bring your own double set at the site.

I don't intend to talk any philosopy stuff here, just point out the there are many personal preference you might not accept


In addition, Jim... Mike R is a wonderful guy to talk with, but I am not sure if they will have a tech class anytime soon.
Actually, DSW is the only tech oriented shop in Indy area. They are also doing CB for the nitrox....

Otherwise, I think it is the best bet to attend Duane's workshop before having a bad habit by yourself.

There is another factor you should consider. Indy isn't a favorable place for the tech divers because there are only two shops for the nitrox fills and you have to leave the tanks for at least three hours or one week. Depending on your schedule and location, it can be a real PITA from the some point. So, that's the reason why many tech orented divers based on Indy have their own fill station. Of course, you can fill the plain air at BS though....

 

[rjack321]

However, the most important use of an indepenent double is the gas management.
So, there is no chance to drain either tank. Each tank must have 1/3 air at the end of dives. Yes, you can still use the bugeed second and a long primary hose. You can give a long hose to your buddy anytime..

Yes but you have to breath:
1/3 long hose
1/3 backup
turn dive
1/3 long
1/3 backup
(or swap order)

not 2/3s of one and then 2/3rds of the other (which would also leave you with 1/3 in each at the end)

 

[Hoosier]

Nope.

1/3 on long hose
1/3 on back up
turn dive
1/3 on back up
1/3 on long hose again.
(or swap order)

In addition, for the deco profile,

1/3 on back up
1/3 on long hose
turn dive
1/3 on back up
Deco