[PSUBS-MAILIST] CNG installed

Sun Jun 9 05:51:26 EDT 2019

 Brian,I bought the trawl floats from Trawlworks in the USA.  Alan has a great idea there.  I have dragged 20 lb propane type tanks to my test pool and tied them to a sub to get things sorted out.  Hank
    On Saturday, June 8, 2019, 7:38:20 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Brian,a pity you haven't got a pit in your back yard to test in like Hank.It must get expensive transporting & hiring the crane every time.I would suggest grabbing anything that floats that you can attachto your sub (20 litre containers etc) and also anything heavy you can attach, & booking yourself sufficient time  to leisurely move floatation & weights around till you are neutrally buoyant & stable. Then look at replicating that with syntactic foam or whatever.I know this will be a pain but I think it will be the quickest way toget it right. I did similar but in a swimming pool.Any Psubbers near you that could help?Alan
On 9/06/2019, at 1:12 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hank, Alan,                Yes I'm hoping for the best , I've got that tank as high as it will go, it may just work, the flotation will not engage until later now.  I know Carsten has vertical tanks inside his Euronaut but I'm not doing that ..    I still have another option of bringing the tank out of out the shell and angling up a bit as well.   Also I still have some syntactic foam that I might strap onto the front wings to get that nose up.  
  The large ferro cement ballast tank structure seems to be proving it's merit for when it is on the surface and for supply ample freeboard but in submerge mode the only real buoyancy that I'm getting is from the pressure hull, everything else is just dead weight or neutral.  I want to completely flood the ballast so I don't get any free moving water, although I could stand some bubble in the very top of the two saddle chambers I think.  
But Hank I think I'm still going to need some of those buoy things.
Brian

--- personal_submersibles at psubs.org wrote:

From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] CNG installed
Date: Sat, 8 Jun 2019 21:07:59 +0000 (UTC)

 Brian,Funny, my first log salvage ROV had two horizontal tanks and was very unstable so we did exactly that and stood them up and it worked fantastic.  I bet if you keep it horizontal and raise it to the max it will work good.Hank
    On Saturday, June 8, 2019, 1:22:39 PM MDT, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Maybe I could mount it like this  ..lol
Brian

--- personal_submersibles at psubs.org wrote:

From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] CNG installed
Date: Sat, 8 Jun 2019 10:13:03 -0700

Raising the tank is definitely what I need to do , just not sure if there is enough space there to make a difference , but it's definitely worth a try before I do anything drastic .  I won't start cutting those concrete front wings off just yet.  
  Just as a side note though, which more of a curiosity ,  I could have a free floating tank with guides that would float up until it started influencing the buoyancy .  
Brian

--- personal_submersibles at psubs.org wrote:

From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] CNG installed
Date: Fri, 7 Jun 2019 17:59:45 -0600

Brian.  Just raise the tank as high as possible. Changing to trawl floats will make no difference.Hank

Sent from my iPhone
On Jun 7, 2019, at 3:29 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Brian,Is that faring above the tank a free flooding area & if so can youget air trapped in it. There looks to be a foot of space between the Tank & faring; can you mount the tank higher!Alan
On 8/06/2019, at 9:16 AM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Here is a pic of the tank:

Brian

<CNG1.jpg>

<CNG2.jpg>

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