[PSUBS-MAILIST] Inflatable sub support

Tue Aug 9 13:50:11 EDT 2016

What a plan Vance... I never thought about towing stability, but good
thought. Perhaps I'm biting off more than I can chew with this idea, with
so many variables involved.

For crew swaps, I was picturing a Zodiac go-between so we don't have to
worry about bumping/scraping. ~ Doug S.

On Mon, Aug 8, 2016 at 9:28 PM, via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Maybe a little drawbridge extension off the dive platform?
> Vance
>
>
> -----Original Message-----
> From: Alan James via Personal_Submersibles <personal_submersibles at psubs.
> org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.
> org>
> Sent: Mon, Aug 8, 2016 9:26 pm
> Subject: Re: [PSUBS-MAILIST] Inflatable sub support
>
> They look interesting Doug, haven't seen them before.
> Along with the long whips I saw some short strong homemade
> versions.
> I like Vance's idea. You would really have to do your homework
> first & develop two sturdy tow points tailor made for those
> mooring whips. Something suitable for changing out differing
> sized whips. Not sure how you would get on to the sub without
> getting wet though. If you pulled the nose of the sub in by rope
> you would have the motor in the way. Perhaps this could be the towing
> solution, but the boarding problem might need an additional answer.
> Have fun.
> Alan
>
>
> ------------------------------
> *From:* Douglas Suhr via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Tuesday, August 9, 2016 8:26 AM
> *Subject:* Re: [PSUBS-MAILIST] Inflatable sub support
>
> That is my biggest concern with the cat/floating gantry idea - the sub and
> tender will behave so differently in any given wave action.
>
> Here's an idea I've been pondering since last spring... it won't help with
> transport time, but it could potentially make entry/egress safer (ie
> preventing a cabin flood/sinking situation): The last couple of years down
> in Florida, I've seen these fiberglass mooring poles being used on boats in
> the canals. They're like fishing poles, but much stronger... semi-rigid but
> still quite flexable. The poles are mounted at an angle off your dock. They
> moor your boat, hold it away from the dock and flex up and down with the
> tides and waves.
>
> Now supposing we had a couple of those babies mounted aft-ways off the
> Whaler. When we wanted to do a crew swap, a support diver would hook the
> pole lines to the lifting lugs on the sub. This would hold the sub away
> from the boat, flex to make the difference between boat and sub and provide
> extra support/tipping safety while changing crew. ~ Doug S.
>
> On Mon, Aug 8, 2016 at 3:08 PM, Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Doug,
> Graham Hawkes had a modified catamaran for transporting one of
> his subs. I couldn't find an image of it but it was posted on Psubs a few
> years back. I am not sure whether this was successful or not. I am
> guessing it wasn't as I haven't seen it again.
> A problem with it could be that you would have to manoeuvre over
> the submersible, & then attach cables. In slightly rough seas you would
> need lateral control of the catamaran to keep it from riding on to the sub.
>    The experience out from Islamorada where 3 of us were trying to hold
> your boat at arms length from Snoopy to transfer passengers, was a bit
> of a lesson. I have said it before, but the sub seemed to remain stationary
> in the water column while the boat bounced up & down around it, & was
> in danger of landing on it.
> Alan
>
>
> Sent from my iPad
>
> On 9/08/2016, at 5:39 am, Douglas Suhr via Personal_Submersibles <
> mailto:personal_submersibles at psubs.org <personal_submersibles at psubs.org>>
> wrote:
>
> Alan / James / Dave, all great suggestions, thanks for the ideas! As much
> as we could all sit here and spec out our dream tender/support boat, I
> think you guys are wise to suggest the KISS method in one way or another.
>
> I probably favor the idea of starting with a two hulled (cat/party barge)
> design the most, but it will depend on what is available for cheap at the
> time we go to buy :) ~ Doug
>
> On Mon, Aug 8, 2016 at 11:28 AM, David Colombo via Personal_Submersibles <
> mailto:personal_submersibles at psubs.org <personal_submersibles at psubs.org>>
> wrote:
>
> Hi Doug, I remember the tow out if the snoopy in the keys. It seems to me
> that bases upon the number of used boats in the area, I'd buy and
> fiberglass boat for just the bow. Get out the Sawzall cut off what I need,
> weld up a cradle that could link to hull of snoopy, use Alans ideal of a
> inner tube, but use it as an expandable cushion between fg hull and snoopy.
> Your then ready to tow.
> David Colombo
> On Aug 8, 2016 12:43 AM, "Douglas Suhr via Personal_Submersibles" <
> mailto:personal_submersibles at psubs.org <personal_submersibles at psubs.org>>
> wrote:
>
> 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 <
> mailto:personal_submersibles at psubs.org <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 boat
> with the back missing.) Use an air pump to deflate & inflate it. It would
> probably
> require a winch up front to help the sub get fully on board. If it was
> strong enough
> you could trailer the sub on this inflatable base.
> It would increase the towing speed & make it easy to board in rough
> conditions.
> Alan
>
>
>
> Sent from my iPad
>
> On 6/08/2016, at 3:13 pm, Douglas Suhr via Personal_Submersibles <
> mailto:personal_submersibles at psubs.org <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 <personal_submersibles at psubs.org>>
> wrote:
>
> Doug,
> I have seen a number of inflatable pontoon systems for lifting boats
> above the water. They all used pumps to pump out the water.
> I wonder if there is merit in designing an inflatable pontoon that you
> could
> lower, & drive Snoopy on to, then fill with air & tow.  It would
> solve the problem of boarding in rough seas, as you could climb in while
> it was up on the pontoons. The pontoons would also make it easier to
> board 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
>
> Sent from my iPad
>
> On 3/08/2016, at 12:50 pm, Douglas Suhr via Personal_Submersibles <
> mailto:personal_submersibles at psubs.org <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 <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.av
> I'm with Jon on having a descent surface communication system.
> Alan
>
>
>
> ------------------------------
> *From:* Douglas Suhr via Personal_Submersibles <
> mailto:personal_submersibles at psubs.org <personal_submersibles at psubs.org>>
> *To:* Personal Submersibles General Discussion <
> mailto:personal_submersibles at psubs.org <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 <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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