Re: [PSUBS-MAILIST] Collision with surface vessel

["" <psub101@iquest.net>]

Brian, 
I like this idea.  I will be interested in seeing other's comments as to why 
this wouldn't be a good compromise between creating upward visibility while 
reducing penetrations/cost (1 less viewport). 

Steve McQueen
Indianapolis

  Quoting Brian Cox <ojaivalleybeefarm@dslextreme.com>:

> I have been thinking about this same thing recently,  instead of another
> viewport in the hatch what about a mirror at 45 degrees looking out of
> one of your straight ahead viewports?
> 
> Brian
>   ----- Original Message ----- 
>   From: Jay K. Jeffries
>   To: personal_submersibles@psubs.org
>   Sent: Tuesday, May 08, 2007 16:43
>   Subject: RE: [PSUBS-MAILIST] Collision with surface vessel
> 
> 
>   Peter,
> 
>   I agree with you that a collision on or near the surface is one of the
> most likely major accidents to happen to a PSUB.  This is supported by
> submarine history demonstrating that this is one of the largest causes
> of submarines under peace-time conditions.
> 
> 
> 
>   The ABS included the requirements for a small porthole in the hatch so
> that you could look up while approaching the surface and hopefully see
> the shadow of a vessel overhead that is silent or stopped.  Larger
> submarines with a periscope have the capability to train the scope's top
> lens upwards to accomplish the same feat.  Many sub's operating
> procedures include a pause in ascent near the surface to look and listen
> for other vessels in the near vicinity.
> 
> 
> 
>   If you do not have much internal noise in your PSUB, you should hear
> most power vessels while still at some distance.  A trainable hydrophone
> will help discern the direction.  The cabled camera is a good substitute
> for a periscope but will be difficult to obtain a stable image with
> known viewing direction on the surface.  Just remember that gadgets just
> require more maintenance and can detract from pleasurable operating
> time.
> 
>   R/Jay
> 
> 
> 
> 
> 
>   Respectfully,
> 
>   Jay K. Jeffries
> 
>   Andros Is., Bahamas
> 
> 
> 
>   A skimmer afloat is but a submarine, so poorly built it will not
> plunge.
> 
> 
> 
>   From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Peter Madsen
>   Sent: Monday, May 07, 2007 6:28 PM
>   To: personal_submersibles@psubs.org
>   Subject: [PSUBS-MAILIST] Collition with surface vessel
> 
> 
> 
>   Hi Psubbers,
> 
> 
> 
> 
> 
>   When people talk of submarine safety the situation most often assumed
> is a sub in distress on the seabed. This is of cause a very critical
> situation,
> 
>   and we all design boats that are redundant in many ways so that we
> hopefully never get in that situation.
> 
> 
> 
>   In my practical experience - however - getting hit by a passing
> surface vessel when being at or very close to surface is a much more
> likely incident. Depending on the speed and size of the vessel and
> submarine any level of damage is possible - and the sub I likely to sink
> with its pressurehull ruptured to some extent after the collision.
> 
> 
> 
>   We are currently adding hydrophones to Kraka for detection and
> classification of surface sound contacts, and we are designing a cable
> camera for the UC3 - that can be send up prior to surfacing. We hope
> these technical gadgets may make it more safe to operate our subs.
> 
> 
> 
>   The professionel submariners ( navy ) that I have talked to say that
> they solely depend on their passive sensors - hydrophone arrays - and
> they have zero way of detecting a drifting - stopped or sailing vessel.
> 
> 
> 
>   What do other non navy submarine operator do - how do you psubbers
> handle this safety issue ? Most people ask me why we don't just have an
> underwater radar ?! - or is it sonar - a sea surface hull detection
> device...like the navy...
> 
> 
> 
>   Well - what do you do ?
> 
> 
> 
>   Regards,
> 
> 
> 
>   Peter Madsen
> 
> 
> 
> 
> 
> 
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