[PSUBS-MAILIST] Thruster

Wed Feb 8 21:18:34 EST 2023

Not sure what the total cost of a SCUBA regulator plus the effort of adapting it to this application is, but I just thought I would mention how I might address this problem, and that is through the use of a combination dome and spring loaded regulator, like a Tescom 44-4000 series, with the dome referenced to ambient pressure with e.g. an oil filled externally mounted bladder or pressure reference tube. Such a regulator could serve as a central source of compensation air for multiple compensated volumes, and could probably be sourced at a cost which isn't all that much greater than a SCUBA reg and the value of your time.

Sean

-------- Original Message --------
On Feb. 8, 2023, 15:23, Rick Patton via Personal_Submersibles wrote:

> Yes I think I’ll go that route and someone mentioned that they hooked up to the exhaust port and ran it higher than the reg? Could you maybe draw a simpler diagram of what you did, and the principle of why that works?
> Rick
>
> Sent from my iPhone
>
>> On Feb 7, 2023, at 4:51 PM, Rick Patton <satwelder at gmail.com> wrote:
>
>> 
>> I was hoping that Alec was going to chime in as he had told me on a phone conversation a while ago that his air comp system had failed a little and had let some water into I believe his thrusters and accuators for the arm?? Alec, I hope I am not misquoting you. Let us know what you experienced. Hank and Alan, let me know as soon as you can when you have some results on your LP regulators.
>> I have been sailing down the East coast from Virginia about 3 months ago hitting all the little places and larg as we go and our final destination was the Bahamas but as we were about an hour away from making landfall, I fell and broke my leg in the cockpit so when we got to the marina, we ubered to the hospital and they had to put 2 screws into the top of the Tibea so we found a place to store the boat and flew 6,000 miles away from the Bahamas back to Hawaii to rehab the leg. 😬
>>
>> I am probably (I hate guessing when it comes to launch times) about 3 months away from doing her first dunk to get her trimmed out. I can't wait because as you know, the vis is real good here and can see things coming sooner than later. The barge company that transports all materials from the mainland to the Islands lost about 14 shipping containers just before it pulled into the port of Hilo and they drifted for a bit then sunk so I am going to see if I can find any of them. I called the insurance company who now owns them and they didn't really seem to care if I retrieved any of them or not. A small barge and a boom truck and I am in business.
>> Rick
>>
>> On Tue, Feb 7, 2023 at 2:37 PM hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>> Hi Rick,
>>> Are you compensating the thrusters and arm from the same regulator? I would caution you on doing that. I have a theory that putting multiple items on one scuba regulator will not work if there is any distance between items. My arm as I mentioned is working well with the scuba reg because it is literally a few inches from the manifold. The hose connecting the reg to the manifold is 1\2 inch ID. This is the reason I am testing an LP regulator, because I can create as much over pressure as needed to help with distance between items. I agree with Alan, that the water should not get to the motors on the surface, particularly if you have some vertical line right off the reg.
>>> It is sounding like there will be a launch soon?
>>> Hank
>>>
>>> On Tuesday, February 7, 2023, 03:59:36 PM MST, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>
>>> Alan, My second stage is located as low as possible but Alec has the same exact "I followed his design" system and he said that he had gotten some water in the thrusters as well as the accuators, plus I was thinking that the force of water being as dense as it is would force it's way down the tube as the water burbles over and around the mouth piece and there is no resistance in the lines or housings to prevent that as they are at one atm.
>>>
>>> Rick
>>>
>>> On Tue, Feb 7, 2023 at 12:26 PM Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>
>>>> Rick,
>>>> I thought you said that your second stage regulator was lower than your thrusters. How is the water going to get in to them? The exhaust valves on the second stage should keep the water out of the system; however I did add an extension to the exhaust port on mine, just to make sure.
>>>> I have advised at various times to use octopus regulators that are less prone to free flowing.
>>>> One problem I can see is that the exhaust valves may suck open with the water flowing past them while towing. But even if they did, with the thrusters higher than the regulator you shouldn't get any water in.
>>>> However I am building a better over-pressure system.
>>>> Alan
>>>>
>>>> [Sent from Yahoo Mail on Android](https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature)
>>>>
>>>>> On Wed, 8 Feb 2023 at 11:07 am, Rick Patton via Personal_Submersibles
>>>>> <personal_submersibles at psubs.org> wrote:
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