[PSUBS-MAILIST] Underwater linear actuator to 2000ft

[David Colombo via Personal_Submersibles]

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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