[PSUBS-MAILIST] sub test

[Alan via Personal_Submersibles]

Hi Brian,
congratulations on getting under the water.
I thought you might have been up on the conning tower rocking her around
to check the stability.
DNV-GL have rules on stability & procedures for testing. They might be a good
Guide line to see if the stability is acceptable.
Maybe you could get rid of 10ft of the front of your sub. I can't see it's purpose.
You could always put a small deck on the sphere starting at the base of the conning
tower, & have either syntactic foam, floats or a ballast tank under it. Then add lead as needed to the inside of your hull.
That huge conning tower is going to destabilise you on the surface until you descend 
to the point that it's weight is negated by it's positive buoyancy. 
Alan

> On 19/08/2019, at 6:12 AM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hi All,
>                   Well I removed a massive section of concrete from the front top area of my sub to lighten the overall weight and especially the weight up front.   I wasn't really sure how this would effect things so I didn't try to anticipate anything, so I just put her back in the water to see what would happen.  I did move some weight forward because I though maybe that would be necessary.   So it looks like I have an imbalance and I appear to be a little top heavy when in the surfaced state, and the nose will need some added buoyancy.  It looks like I'm going to have to add some flotation pontoons to the sides back towards the sphere so I don't tip over.  Also I have some material that I can remove up top that is not necessary  , I built on a support structure under my deck that is way over built , so I can shed a little weight there.  
> 
> Anyway here is a video of my latest dunk test:
> 
> 
> 
> https://www.youtube.com/watch?v=-S3CZU66mGs
> 
> 
> Brian
> 
> 
> 
> 
> 
> 
>   
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