[PSUBS-MAILIST] Commercial question

[Sean T. Stevenson via Personal_Submersibles]

I could think of a few advantages to untethered operation:

1) complete decoupling from surface motions, which is achievable with a ROV if you use a deployment cage and neutral secondary cable, but then weight and cost go up
2) if not using a cage, a large portion of the propulsive power is wasted just dragging the umbilical through the water
3) tethered operation requires keeping a turn count, which must be incremented or decremented according to whether the cable is above or below the vehicle
4) situational awareness. Even the best ROV fields of view leave blind spots, or at best require interpreting multiple camera angles, whereas a sub permits its operator to seamlessly shift his attention and field of view in an intuitive manner. Similarly, unless using stereoscopic cameras, ROV images are 2D. A sub operator has depth perception.

Sean


On May 14, 2014 8:43:27 PM MDT, swaters via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>I have always heard that ROV's are cheaper to operate, less risky, and
>cheaper to buy. I was curious what is the advantages of submarines in
>the commercial world such as the oil industry? It seems like Phil
>Nuyten has been able to be sucsessful with submarines. Just a
>curiousity of mine.
>Thanks,
>Scott Waters
>
>
>
>
>Sent from my U.S. Cellular© Smartphone
>
>------------------------------------------------------------------------
>
>_______________________________________________
>Personal_Submersibles mailing list
>Personal_Submersibles at psubs.org
>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20140514/6fbe7739/attachment-0001.html>