[PSUBS-MAILIST] auto pilot

[hank pronk via Personal_Submersibles]

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> wrote:
 

 Hank,when the valve opens, is it going to stay open & continually send airin to the ballast tanks? Also you mention an external pressure sensorto 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> 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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