[PSUBS-MAILIST] Underwater linear actuator to 2000ft

[David Colombo via Personal_Submersibles]

Thanks Cliff.
My very first mockup of the front pilot station was full scale.  It also
drove a design change from a 24" hatch to 30" diameter hatch. I found out
the hard way one Sunday evening after everyone was in bed,  my cell phone
was on the workshop bench, and I climbed inside,  a little smaller than I
liked,  and defianatly two small when I discovered that I could not
extricate myself as I could not bend my knees. Good thing I had a drill
motor within arms reach to deconstruct the hull from the inside.  So I am a
big believer in full scale models.
On Oct 8, 2017 9:51 AM, "Cliff Redus via Personal_Submersibles" <
personal_submersibles at psubs.org> wrote:

> Great to see progress.  My experience on small boats is this is a very
> important step to make  sure you can get in and out of the boat and to get
> access to critical components.  Helps bring the project to life when you
> can sit in the wooden mockup.
>
> Keep up the good work!
>
> Cliff
>
> On Sat, Oct 7, 2017 at 1:18 AM, David Colombo via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> For that price, I'm sure hank could build a dozen of them.
>> On Oct 6, 2017 6:38 PM, "Alan via Personal_Submersibles" <
>> personal_submersibles at psubs.org> wrote:
>>
>>> Found this underwater actuator.
>>> Wouldn't dare estimate the price, but it is probably something we
>>> could make easy enough!
>>> https://www.ultramotion.com/industries/underwater-linear-actuator/
>>> It is oil compensated & uses a brushless motor.
>>> From the pictures, it has an enclosure near the rod end that has slots
>>> in it. I am guessing there is a rubber bellows / bladder in there to keep
>>> the inside of the actuator at ambient pressure & to expand & contract
>>> to compensate for displaced oil as the piston moves in & out.
>>>    Of interest is that it is saying that the motors can be over-driven by
>>> 2-3 times due to the dissipation of the heat off the coils to the
>>> seawater
>>> through the oil. A good argument for oil compensating rather than air.
>>> Also being brushless the oil is not going to lift the brushes.
>>> Alan
>>>
>>>
>>>
>>> Sent from my iPad
>>>
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>>>
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>
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