[PSUBS-MAILIST] Looking at starting up a Submersible project

Mon Nov 21 15:59:21 EST 2016

Ludwig,I believe Brent wasn't that happy with his dry ambient, & thereare aspects that I didn't like, like his large square hatch.You are only ambient at a certain point between the bottom ofyour hull & the top. Everything below this point is under external pressure& everything above is under internal pressure. This can put a lotof internal force on the hatch. To visualize it, mentally flip your sub upsidedown and fill it with water to ambient point. The weight of water on your hatchwill be equivalent to the internal air pressure on it when diving. There are modifications to the batteries that need doing if you want themin the hull, as they typically crush at about 15ft.You have 20 liters of air per person flowing in to the hull for life supportplus the air for equalization, which is 4 x the volume of your sub at 100ft.So a lot of air needed. You need to watch that any electronics can handle the pressure you arediving to. I made an ambient that is unofficially the World's smallest submarine as a model for a 1 atm. http://www.psubs.org/projects/1235435392/ambientsub/I can help you if you are set on a dry ambient.Regards Alan

      From: via Personal_Submersibles <personal_submersibles at psubs.org>
 To: personal_submersibles at psubs.org 
 Sent: Tuesday, November 22, 2016 8:52 AM
 Subject: Re: [PSUBS-MAILIST] Looking at starting up a Submersible project

I was talking with Scott and he also mentioned that it would take longer then two years to built a 1 atm sub.
What I'm looking at now is building a dry ambient submarine.  I would learn a lot with building it plus when I move aboard, I can set down and start building a 1 atm sub.  I found a 3 man dry ambient submarine built in New Zealand by Brent Shaw that I'm looking at down scaling for one person.
I should also probably mention that I'm also a scuba diver so a dry ambient submarine won't be much of a problem.
-Ludwig 

-----Original Message-----
From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Mon, Nov 21, 2016 1:28 pm
Subject: Re: [PSUBS-MAILIST] Looking at starting up a Submersible project

Hi Ludwig, welcome.If you only have 2 years you won't have enough time to finisha 1 atmosphere submarine. Small or large, it will still need a similar amount of time. I built a dry ambient, which was a great learning experience, but is not as safe as a 1 atmosphere.    Take up Scotts offer of a visit, you will learn a lot from that.Also read through the "Busby manned submersibles" book. There is a link on the Psub site o an online version, but mostpsubbers end up buying a copy of it.Cheers AlanNew Zealand

      From: via Personal_Submersibles <personal_submersibles at psubs.org>
 To: personal_submersibles at psubs.org 
 Sent: Tuesday, November 22, 2016 3:55 AM
 Subject: Re: [PSUBS-MAILIST] Looking at starting up a Submersible project

That really doesn't help me much because I'm planning on moving across the pond in around two years!
I'm looking at a small project that would teach me all the systems so when I move across the pond, I would like to build something along the Euronaut size or a tiny bit smaller.
I've also debated if I should do a wet-sub instead because if I go that route, I wouldn't have to build a pressure hull.  That would only limit me down to 130 foot allowed for recreational diving.
-Ludwig

-----Original Message-----
From: James Frankland via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Mon, Nov 21, 2016 8:44 am
Subject: Re: [PSUBS-MAILIST] Looking at starting up a Submersible project

I think emile has a small ish boat requiring refurbishment for sale?  Probably worth the cost of shipping it over the pond to not have to build from scratch.
On 21 November 2016 at 13:51, Brian Hughes via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

I know of an original VAST boat someone is trying to sell out here on the East Coast.

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