[PSUBS-MAILIST] submerge !

Thu May 9 19:00:57 EDT 2019

Hi Brian,

That was a big step, congrats! I thought the video looked like you were not far off at all on buoyancy, because the straps appear quite loose. Good trim too! Also it seems there’s just oodles of volume in the MBTs. When you say you couldn’t get the bow to rise, d’you mean even blowing the forward MBT? Given it’s apparently generous volume, that would seem surprising.

Thanks,
Alec

Sent from my iPhone

> On May 9, 2019, at 5:43 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hi Alan, 
>                    That video with me rocking back and forth was with absolutely no lead ballast in the bottom, so it was very unstable at that point. 
> 
>  It's basically too heavy, so I can reduce the lead ballast somewhat, but if I take too much out it will be more unstable during the transition stage.  It was hard to get a good reading on what was happening because I couldn't tell if the front straps were supporting the front of the sub.  I think they were though, I did a test where I tried to bring the nose up by it self and I couldn't do it , so that tells me that the nose is still a bit heavy.    I think I want to get one of those fiberglass hp tanks that Hank was talking about.  
> 
> Brian 
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] submerge !
> Date: Fri, 10 May 2019 09:29:53 +1200
> 
> Brian,
> Congratulations! 
> The sub is looking good with all your recent modifications.
> Did you test the stability at all? I know in a previous video you were in the
> Conning tower rocking her about. Would have liked to have seen a diver
> on the outside trying to pull her over as you went down. 
> Looked like you could trim her well, were you happy with that?
> Alan
> 
> On 10/05/2019, at 9:16 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Brian,
> You get first prize for classy test facility.  Congratulations!  you sure got some big ass vent valves
> Hank
> 
> On Thursday, May 9, 2019, 2:32:55 PM MDT, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hi all,
>                      Finally went all the way under !    Need to adjust a few things.  Combination of less ballast weight overall and some additional buoyancy in the nose.
> 
> 
> https://www.youtube.com/watch?v=QlPXqX9Vmgo 
> 
> 
> 
> Brian
> 
> 
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