[PSUBS-MAILIST] Inflatable sub support

Mon Aug 8 05:38:05 EDT 2016

Doug,in the mean time maybe something like a truck inner tubecould be temporarily fixed around the conning tower &inflated & deflated by a support diver. It could be stowedas a back up in case, as we experienced, you tow for hours& it's too rough to board.I think I have heard of something like that being done, moreexperienced members might shed a bit of light on that.Alan

      From: Douglas Suhr via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Monday, August 8, 2016 7:42 PM
 Subject: Re: [PSUBS-MAILIST] Inflatable sub support

Yeah, I like the simple logistics/mechanics of a rig like you described here Alan. Let's face it, anything would be better than a full-on tow! I'm often big smoke/no fire when it comes to projects like these, but at the same time, we are going to be hurting in the Keys without something to make entry/egress safer and transit to/from dive locations more efficient. ~ Doug S. 
On Sat, Aug 6, 2016 at 1:31 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Doug,Cliff was thinking about this issue a while back.Perhaps a purpose built hard fibreglass hull that conforms to Snoopy's lower hull,with an inflatable pontoon attached, but with no back section. ( an inflatable boatwith the back missing.) Use an air pump to deflate & inflate it. It would probablyrequire a winch up front to help the sub get fully on board. If it was strong enoughyou could trailer the sub on this inflatable base.It would increase the towing speed & make it easy to board in rough conditions.Alan

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On 6/08/2016, at 3:13 pm, Douglas Suhr via Personal_Submersibles <mailto:personal_submersibles at psubs.org> wrote:

Alan, I like that idea (a "pump barge"). Whatever we determine will work, it's gonna have to deal with relatively rough seas. ~ Doug S.  
On Tue, Aug 2, 2016 at 9:56 PM, Alan via Personal_Submersibles <mailto:personal_submersibles at psubs.org> wrote:

Doug,I have seen a number of inflatable pontoon systems for lifting boatsabove the water. They all used pumps to pump out the water.I wonder if there is merit in designing an inflatable pontoon that you couldlower, & drive Snoopy on to, then fill with air & tow.  It wouldsolve the problem of boarding in rough seas, as you could climb in whileit was up on the pontoons. The pontoons would also make it easier toboard without bashing your boat against the sub.You would need a large barge if you are looking at hoisting in to the water.It wasn't the easiest in perfect conditions in to your canal.I think they use a ballasted platform in Hawaii ( similar idea) Scott might confirm that as he has just been there.Alan
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On 3/08/2016, at 12:50 pm, Douglas Suhr via Personal_Submersibles <mailto:personal_submersibles at psubs.org> wrote:

Good point Alan, wave height is an issue on more than one hand with Snoopy (as I'm sure you're aware). 
BTW, we're starting to look seriously into building or buying a barge for the Keys. We've got to get Snoopy out to the oceanside more quickly than by towing her. ~ Doug S. 
On Tue, Aug 2, 2016 at 6:42 PM, Alan James via Personal_Submersibles <mailto:personal_submersibles at psubs.org> wrote:

Doug,sounds like a cunning plan!Be aware that it might work when the water surface is flat,but fail if there is too much of a wave.avI'm with Jon on having a descent surface communication system.Alan

      From: Douglas Suhr via Personal_Submersibles <mailto:personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <mailto:personal_submersibles at psubs.org> 
 Sent: Wednesday, August 3, 2016 8:29 AM
 Subject: Re: [PSUBS-MAILIST] OTS transducer location

'Sound' thoughts Jon... :) ~ Doug S.  
On Tue, Aug 2, 2016 at 4:25 PM, Jon Wallace via Personal_Submersibles <mailto:personal_submersibles at psubs.org> wrote:

Nothing wrong with Radio comms on surface, in fact you should have a VHF for ocean water anyway.  Depending upon the location of the transducer on the vessel, at the surface you may find you don't have enough water column to communicate effectively.  Test first.

Jon

On 8/2/2016 3:09 PM, Douglas Suhr via Personal_Submersibles wrote:

Dad and I are planning to try a little experiment in regards to the mounting location of Snoopy's transducer array. The idea is to mount the array on a hinged whip behind the hatch. While she's on the surface the transducer will be under the waterline for surfaced communication with surface support (if the boat and sub are out of earshot of one another). When Snoopy submerges, the array's float lifts the mast erect over the sub, becoming the tallest part of the vessel while submerged.

Just an idea, but we're keen to try it when we get the chance. One possible drawback is entanglement danger... we've been thinking a lot about that lately. ~ Doug S.

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