[PSUBS-MAILIST] k-250 building questions

[hank pronk via Personal_Submersibles]

 Hi Philippe,It is nice to hear of another project getting under way.  I think if you are building from scratch, the side mount MBT's are the only way to go.  You can use four tanks with a space between the tanks for the side thruster wash.  I think however that steel tanks might be to heavy for a K250 , making the sub behave poorly when you transition from floating to sinking.  You will have to do some calculations first, I would recommend aluminum tanks over fibreglass.  My sub also had lead acid batteries in a sealed compartment with an air flow system for charging.  I went with AGM batteries for the simplicity and added safety.  Hank
    On Tuesday, September 5, 2017, 6:56:48 PM MDT, Philippe Robert via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hi All,
I undertook the construction of a k-250 submarine. I have most of the metal components to make the pressure hull. I have some questions about batteries, MBT and acrylics dome.
-Is it a good idea to use deep cycle lead-acid battery inside the pressure hull ? I read on old psubs mailing list to open the hatch when the batteries is charging. (h2)?
-Do you think that the MBT can be replace by steel saddle tanks ? I have no idea how to make the original one and if I can upgrade the original MBT it will be great.
-I try to find someone to make my acrylic dome with some experience in submarine dome forming.
-I live in Quebec, Canada. So, if you know k-250 owner near New Hamphire, Vermont or Main it will be great if I can take a look on the sub. An hour or two, I do not want to disturb the owner.
tanks
Philippe 
phelop at gmail.com




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