[PSUBS-MAILIST] hydraulics

[hank pronk]

Vance,
Agreed, but there is a way to avoid this without compensation.  You must use cheap hydraulic cylinders because they use an o-ring on the shaft instead of a wiper seal.  A wiper seal needs pressure on one side to seal against water intrusion.  With an o-ring seal that is not the case, an o-ring is a non directional seal.  Essentially the hydraulic cylinder with an o-ring seal is exactly the same as a reach rod sealing system.  
Hank

From: "vbra676539 at aol.com" <vbra676539 at aol.com>
To: personal_submersibles at psubs.org 
Sent: Thursday, September 19, 2013 9:10:55 AM
Subject: Re: [PSUBS-MAILIST] hydraulics



Hank and all,
The issue is overall system pressure versus ambient pressure. If you have a hydraulic unit that builds pressure only when it is activated, and returns to zero when static, then any, and I mean ANY leak point will allow water to creep into your oil. A spring loaded compensator preset to your max ambient plus a little would mitigate that by maintaining system pressure at whatever you set it for.
Vance
-----Original Message-----
From: hank pronk <hanker_20032000 at yahoo.ca>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Thu, Sep 19, 2013 3:22 am
Subject: Re: [PSUBS-MAILIST] hydraulics


H Alan,
Bicycle brakes would probably work quite well because they are made from very good material.  
Hank

From: Alan <alanlindsayjames at yahoo.com>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Wednesday, September 18, 2013 11:55:49 PM
Subject: Re: [PSUBS-MAILIST] hydraulics


Hi Brian,
I've wondered about this also.
I was looking at the hydraulic brakes they have on bicycles now days &
wondering if you could adapt them for functions like releasing emergency
bouys or similar.  The manual hydraulics they have on boats, like steering units
are pretty expensive. Would be good to find something of suitable material
off the shelf hat could be used.
Alan
.
Sent from my iPad

On 16/09/2013, at 5:28 AM, "brian" <brian at ojaivalleybeefarm.com> wrote:

> I wonder if those human powered hydraulics could have an application for our boats, like the cats in the America's cup.
> 
> Brian
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