[PSUBS-MAILIST] Underwater linear actuator to 2000ft

[Cliff Redus via Personal_Submersibles]

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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