[PSUBS-MAILIST] right side up compensator

[Alan via Personal_Submersibles]

Brian,
yes, but depending on your depth & ascents, descents within your dive
profile, the reservoir will fill with water defeating it's purpose. If you do
a second dive there is no way of clearing it of water so you may as well
just have a hose.
In my pool experiments with my home made thruster, I was observing the 
compensating oil moving up the oil hose by a few inches every time I
turned on the motor & I have a minuscule volume of oil. In other words the
motor is acting like a pump & throwing the oil out. So one reason to
have some over pressure is to keep the oil in the housing. It is critical for me 
as I have a high powered small motor that relies on the oil for cooling.
Maybe you could take the hose off the reservoir on the motor side, fill the 
hose to a couple of inches from the top & turn the motor on to check this,
as if this is happening then that will be something else you need to factor in.
Got a nation wide shut down at the moment but allowed to walk to the beach
not sure that I can even go fishing there. No boats allowed out. :(
Alan


> On 28/03/2020, at 10:12 AM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan, 
>            Assume the oil goes all the way up to the high point of the oil tube, and then assume the water goes all the way up the water side tube and fills the reservoir all the way up to the top.  Then the only air remaining in the system is at the very top of the reservoir .  That would be the condition at maximum depth.    No? 
> 
> Brian
> 
> 
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] right side up compensator
> Date: Sat, 28 Mar 2020 09:59:43 +1300
> 
> Brian,
> that would work to 30ft at the most. 
> If the volume in the reservoir was 1 litre & the volume in the hose going
> down in to the water was half a litre, then at 30ft the volume would be compressed 
> to half. So the reservoir needs another half a litre to achieve this. And that 
> would mean that the half a litre in the hose would move in to the reservoir &
> the hose would fill up with water.
> The main problem is you haven't worked out how much the oil might expand.
> If you did that you would have a ball park figure to work on.
> You may find that a hose without a reservoir would suffice.
> Or hose with small bladder on the end.
> Cheers Alan
> 
> 
> On 28/03/2020, at 8:20 AM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Here it is right side up hopefully 
> <IMGr_1522.jpg>
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