[PSUBS-MAILIST] auto pilot

Sun Mar 5 18:39:49 EST 2017

Hi Hank,
Fair enough, I figured you would have it well in hand.   The cable with
trawl floats idea is a nice one!

Not that it's likely, but it would be soul-destroying to lose the sub if a
viewport or something failed.

Cheers,
Steve

On Mon, Mar 6, 2017 at 10:14 AM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi Steve,
> Gamma has battery boxes in the bottom of the hull that conveniently create
> a water trap at the front and back of the hull.  Less than a gallon of
> water will trip the float switch.  The air supply actually comes from my
> external 122 cubic foot tank.   The other tanks I was researching are for
> Elementary 3000.  Unfortunately  Slocan lake is very steep on the sides, so
> I have to test in much deeper water with the sub suspended.  There are also
> sunken logs all over the lake, so I want to stay off the bottom.
> Funny I was thinking today, I need to buy another roll of rope so I can
> have a clothesline effect.  The rope will loop through the lifting eye and
> back to the surface.  In a failure, I can pull a small cable down to the
> sub to hook it up, or get another sub out to connect it.  Actually you have
> an idea here, it could have a cable held up with trawl floats that can be
> snagged easily with a grapple hook.
> Hank
>
>
> On Sunday, March 5, 2017 3:42 PM, Stephen Fordyce via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi Hank,
> A pretty basic thing, but do you have enough air supply?  Ie. perhaps you
> will need quite a bit of water leaking in to actuate the flow switches.
> Which needs quite a bit of buoyancy, and since you are at test depth you
> have a whole lot of extra ambient pressure to compensate for. Ie.
> your 10.7cu ft cylinder at 1500PSI will hold air to displace about 1000cu
> ft on the surface, but only 35cu ft at 300m depth.  If that's what you're
> using, I think you will be ok ;).
>
> Another consideration is that for the sake of a few minutes extra before
> the test, it may be worth a couple of minor considerations in case the
> auto-surfacing method fails.  (ie. find a spot in the lake where there is a
> flat bottom at desired depth, leave a lifting ring attached/sticking up so
> that a cable could later be attached to it for lifting a fully flooded sub,
> etc.).
>
> Cheers,
> Steve
>
> On Sun, Mar 5, 2017 at 10:27 PM, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Alan,
> Yes I have opted to exhaust my air supply into the MBT's, if I put a
> timer on the solenoid valves to close them, it may not lift if the sub is
> in a snag of some sort.  I want full lifting power.  The solenoid valves
> will be piped into the existing air feed for the MBT needle valves.  I will
> have the needle valves set to feed the air slowly.  I expect Gamma to be on
> the surface before the air is spent.  I am attaching a 5\16 nylon rope to
> the sub and lowering it 5 lbs heavy, so I could haul it up if I had to.  If
> my timer fails and the sub does not surface, I can also simply lower the
> sub another 50 feet or so and the outside  pressure valve will send power
> to the  solenoid valves.
> Hank
>
>
> On Saturday, March 4, 2017 10:49 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.
> org <personal_submersibles at psubs.org>> wrote:
>
>
> Hank,
> when the valve opens, is it going to stay open & continually send air
> in to the ballast tanks? Also you mention an external pressure sensor
> to avoid going too deep; are you sending it down on a rope or autonomously.
> Alan
>
> Sent from my iPad
>
> On 5/03/2017, at 2:49 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.
> org <personal_submersibles at psubs.org>> wrote:
>
> Hi All,
> I am in the middle of building a remote surfacing system for my subs since
> I seem to be to cheap to go to a pressure chamber.  My system operates from
> a dual industrial timer that powers two solenoid valves, one is redundant.
> The solenoid valves take regulated air to operate an air cylinder that
> actuates a 2,500psi ball valve.  The system also incorporates two float
> switches, one fore and one aft in case water gets in before the one hr test
> is complete.  There is also a internal pressure sensor in case there is an
> air leak, the sub will surface.  There is also an external pressure sensor
> that will prevent the sub diving past the desired pressure test depth.
> Have I missed anything?
> Hank
>
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