[PSUBS-MAILIST] weights

[Alan via Personal_Submersibles]

Hugh,
how are you doing the bms for the life po4 batteries?
Do you have a plethora of balancing wires coming out of your battery pod
& in your hull to plug in to an external balancing charger or is there electronics
in the battery pod & a single data wire coming out?
There are a number of submersibles going with lithium now but can't find any
information on how they are doing the charging.
I had thought of having lithium batteries in an oil filled ambient box, but would
need to make sure any electronics could take the pressure.
Alan


> On 22/08/2019, at 11:37 AM, Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Cliff,
> You are so organised and think of everything.
> I need you down here to push me along and organise things and add your take on what needs to be changed.  Finally starting again on the batteries BMS.  Years are passing me by.  Cheers, Hugh
>  
> From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Cliff Redus via Personal_Submersibles
> Sent: Thursday, 22 August 2019 7:58 AM
> To: T Novak via Personal_Submersibles
> Subject: Re: [PSUBS-MAILIST] weights
>  
> On the R300 we also carry a bathroom scale and try to measure operator at time of dive.  On touchscreen, operator enters this weight. The PLC calculates the ballast needed and adjust the longitudinal position of a 100 lb trim weight hydraulically so that when the boat is flooded , the boat will be approximately trim.  This is necessary as pilot is forward of the boat CG.  I have ballast weights that are color coded and are designed to sit at the longitudinal CG of the boat.  Data logger records the operator weight.  Predive checklist checks that ballast has been added.
>  
> Cliff
>  
> On Wednesday, August 21, 2019, 12:22:09 PM CDT, T Novak via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>  
>  
> From my weight and balance experience flying Air Cadets we always weigh the individuals as they stand all up, including any backpacks, cameras, and water bottles.  Most people only have a vague idea how much they weigh, and the reality is that their weight changes daily, throughout the day, and depending on what they are wearing and carrying. During the PLRP I noticed that Nuytco had a bathroom scale on the crane barge and the DW2000 pilots were weighed each time they got into the sub. External weights were then added or removed as necessary.
> 
>  
> 
> From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of hank pronk via Personal_Submersibles
> Sent: Wednesday, August 21, 2019 7:11 AM
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: [PSUBS-MAILIST] weights
> 
>  
> 
> Hi All,
> 
> When David and I were swapping out passengers in Gamma, the weights were getting off.  It is difficult to make quick weight changes.  David and I both came to the conclusion that a weight chart is in order with well marked weights.  So when your passenger is ready, just look up their weight on the chart and cross reference the required weight in the sub. 
> 
> Hank
> 
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