[PSUBS-MAILIST] second stage adjusting

[hank pronk via Personal_Submersibles]

 Hi Rick, I use a first stage regulator with the spring removed to act as the pressure compensator.  I use a first stage to bring down the pressure from the tank as normal, then send that air to the second first stage regulatow with spring removed, then to the motors.  The output pressure to the motor is a constant 2 psi or so.  I tie all the motors and arm to the one regulator.  I have had no luck with the scuba second stage regulator set up.  Tested to 400 feet, no issues.Hank
    On Friday, January 23, 2026 at 03:46:07 AM MST, via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 
Hi Rick, 

  

I meant that this is probably know to you. Proverbs translate not very well  😉

  

Br, Emile

  

Van: Personal_Submersibles <personal_submersibles-bounces at psubs.org> Namens Rick Patton via Personal_Submersibles
Verzonden: vrijdag 23 januari 2026 05:35
Aan: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Onderwerp: Re: [PSUBS-MAILIST] second stage adjusting

  

Hi Emile, not sure what you mean by open door? My second stage is probably 18" to 24" lower than the thrusters but someone in the group said that he had adjusted his second stage I thought to more over bottom pressure than how they come off the shelf.

  

Rick

  

On Thu, Jan 22, 2026 at 12:07 PM via Personal_Submersibles <personal_submersibles at psubs.org> wrote:


Hi Rick,

 

Maybe a open door but the (vertical) position makes also a difference. Some 10-20”lower than the thruster will create overpressure. 

However, it should be tight without overpressure.

 

Br, Emile

 

Van: Personal_Submersibles <personal_submersibles-bounces at psubs.org> Namens Rick Patton via Personal_Submersibles
Verzonden: donderdag 22 januari 2026 22:32
Aan: psubs chat room <personal_submersibles at psubs.org>
Onderwerp: [PSUBS-MAILIST] second stage adjusting

 

I had shared about a thruster leaking on my first dip. Someone in the group said that they had adjusted their second stage for more positive pressure. I am not sure how to do that.

 

Rick

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