[PSUBS-MAILIST] k-250 building questions

Thu Sep 7 08:35:50 EDT 2017

agreed.  I will get in before summer is over.

On 7 September 2017 at 10:57, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> James,
> Good luck, it would be a pity to have missed the entire summer without a
> dive.
> Hank.
>
> On Thursday, September 7, 2017, 2:03:50 AM MDT, James Frankland via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi hank.  No, it's been hopeless this summer.   I have been trying to get
> in for the last 4weeks and every time something seems to crop up to spoil
> it.  Weather. Lack of divers, work, support boat issues, defender transfer
> box failure.  Also been really busy in the new shop.
> However, I've fixed the car.
> Weather permitting I am going to launch off the beach next week into
> deeper water and much more interesting location.  I have a friend with a
> large telehandler that will lift the sub off the trailer and I will wait
> for the tide to come up.  We have big tides in Guernsey, up to 10m.
> Going to run out of summer soon....
> Anyway, hope for next week.
> James
>
>
> On Wednesday, 6 September 2017, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> James,
> Have you been out this summer with your sub or too busy with your shop?
> Hank
>
> On Wednesday, September 6, 2017, 4:55:38 AM MDT, James Frankland via
> Personal_Submersibles <personal_submersibles at psubs. org> wrote:
>
>
> Hi Phillippe,
>
> As others have said, AGM's and Emile for the dome.
>
> I would try and make it so you can open the hatch from outside.
>
> If the hatch hinge bracket is the same as the K350, make it stronger.  I
> feel like if I lean too hard on the open hatch, it could bend the bracket.
>
> With regards to the tanks.   If your only diving lakes and flat calm
> water, the standard tanks are good.  Tried and tested.
>
> Rough weather and open sea is a different story.
>
> The tanks allow the boat to ride well and I find it takes the open sea
> well, but the tanks spill air.  I made semi enclosed and they still lose
> air in rough water.   I can tell you it is unnerving to be in open sea and
> you boat is trying to dive without you wanting it to.
>
> Enclosing the tanks fully would solve this problem.
>
> If it were me, I would make the standard tanks, but then almost fully
> enclose them all round with just a water inlet hole.  Could be made to fit
> around the forward viewport so you can still see.  Then make smaller saddle
> tanks as well like Alec.
>
> You get all the benefits.  Good longitudinal stability for rough
> weather.   No air loss.  Auxiliary tanks for added cross stability and
> freeboard.
>
> I might even do a picture....slow day at work... :)
>
> Kind Regards
> James
>
>
> 
>
>
>
>
>
>
>
> On 6 September 2017 at 10:23, hank pronk via Personal_Submersibles <personal_submersibles at psubs.
> org> wrote:
>
> 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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