[PSUBS-MAILIST] sub launch

Mon Oct 17 21:05:42 EDT 2016

Hank, how feasible would it be to build ballast tanks into the trailer and make it a floating drydock (or at least, shallow draft dock)?

Sean

On October 17, 2016 6:28:49 PM MDT, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Hank ,
>
>What about attaching a long pole or structure to the sub itself and
>pushing it out .  Maybe start with the sub cantilevered off the back
>end.
>
> 
>
>Brian
>
>--- personal_submersibles at psubs.org wrote:
>
>From: hank pronk via Personal_Submersibles
><personal_submersibles at psubs.org>
>To: Personal Submersibles General Discussion
><personal_submersibles at psubs.org>
>Subject: Re: [PSUBS-MAILIST] sub launch
>Date: Mon, 17 Oct 2016 20:57:11 +0000 (UTC)
>
>Alan,
>
>An extension pole won't help because the lake is not deep enough for
>the sub on the trailer for 100 feet.  I think the A frame or beavertail
>with rollers will be good.  The trailer already has a hydraulic A
>frame, just have to put it back on.
>
>Hank
>
>
>
>On Monday, October 17, 2016 1:13 PM, Alan via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>
>
>Hank,
>
>after more thought, maybe the cheapest easiest way would be to have a
>
>telescopic extension tube between the truck & trailer. Like the
>traditional
>
>method but a lot longer. It would be easy to make; just 3 tubes of
>varying
>
>diameters, with holes for bolts to go through to lock in place. One
>problem 
>
>would be lifting it in to place with the added weight. You would
>
>also then need a small tender to get to your sub. Of course there 
>
>could be the odd problem of drop offs at the end of the boat ramp!
>
>Alan
>
>Sent from my iPad
>
>
>On 17/10/2016, at 11:26 pm, hank pronk via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>Tim,
>
>Rollers under the skids is ideal.  Problem is I don't have skids. 
>Gamma does have a nice raked bumper that is intended to protect the
>dome when the sub comes up to the trailer and to deflect the sub onto
>the trailer.  some times when I launch the sub the water is not deep
>enough and I can just lift the sub and slide it off by hand.  In a case
>like that, the hand winch can pull the sub onto the trailer by sliding
>the sub on the raked bumper.   
>
>I kept all the hydraulic lift stuff from the trailer, so I have a
>couple options. 
>
>Hank
>
>
>
>On Sunday, October 16, 2016 9:38 PM, T Novak via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>
>
>Hank,
>
>If the sub will be float clear of the bottom within reach of an A-frame
>crane on the trailer, would a double beavertail (photo) work for you
>instead of the crane? A double, or triple, beavertail may be sufficient
>to roll the sub off into sufficiently deep water.  Rather than rollers
>on the trailer, perhaps rollers on the sub's skids that would then
>match up with gutter tracks on the beavertail and trailer bed?  At
>least one psub out there has rollers on its skids. The skids should
>also have a ski-tip on each end to allow the winch to drag the sub
>through the mud-sand substrate to launch and recover.
>
>Tim
>
> 
>
>From: Personal_Submersibles
>[mailto:personal_submersibles-bounces at psubs.org] On Behalf Of hank
>pronk via Personal_Submersibles
>Sent: Sunday, October 16, 2016 2:42 PM
>To: Personal Submersibles General Discussion
><personal_submersibles at psubs.org>
>Subject: Re: [PSUBS-MAILIST] sub launch
>
> 
>
>My floating launch cart was better on paper than in the water lol.  I
>don't like the idea of temporary lift from bags, I think it will tip
>over. 
>
>I am thinking about a drop down beavertail, and hydraulic driven
>rollers.  I am sure there will be a new idea tomorrow.
>
>Hank
>
> 
>
>On Sunday, October 16, 2016 3:05 PM, Alan via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
> 
>
>Yes, you don't want it coming off the trailer & sitting in the mud.
>
>What happened to your floating trailer idea? Or can you fit air bags
>low down
>
>on the sub, just to aid buoyancy for tricky launching.
>
>Ok here's another idea that you are well capable of implementing.....
>you
>
>have a floating trailer with pontoons down either side & twin outboards
>on the
>
>end of the pontoons. You drive your trailer in far enough to get the
>props under,
>
>then use outboard power to pull the trailer out till it's floating then
>use it as a tender 
>
>to get to your dive spot.!
>
>Alan
>
>Sent from my iPad
>
>
>On 17/10/2016, at 9:16 am, hank pronk via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>Alan, 
>
>That would work if the sub had a raked front end or the trailer had a
>beavertail.  Not a bad solution indeed, the trailer would need full
>rollers for the sub to roll off.  Gamma has a raked guard now, hmmmm
>you got me thinking, might be less work.  I am not in love with the sub
>sitting on rollers though.  
>
>The lake has not enough depth at the end of the ramp or further out. 
>The sub could cruise out but it would be close to hitting bottom. 
>
>Hank
>
> 
>
>On Sunday, October 16, 2016 1:30 PM, Alan via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
> 
>
>Just googled this idea for a shallow launch & wondered if a more
>
>beefed up version would help. ( 2 parts to the video)
>
>https://m.youtube.com/watch?v=47y0KNSvUgs
>
>Alan
>
>
>
>Sent from my iPad
>
>
>On 17/10/2016, at 6:28 am, hank pronk via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>There is a real nice lake 20 minutes from home that I can't get in,
>(Columbia Lake)  yes the start of the mighty Columbia river.    The A
>frame will allow me to dive there.
>
>Hank
>
> 
>
>On Sunday, October 16, 2016 11:22 AM, Brian Cox via
>Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
> 
>
>Interesting idea ! 
>
>--- personal_submersibles at psubs.org wrote:
>
>From: hank pronk via Personal_Submersibles
><personal_submersibles at psubs.org>
>To: Personal Submersibles General Discussion
><personal_submersibles at psubs.org>
>Subject: [PSUBS-MAILIST] sub launch
>Date: Sun, 16 Oct 2016 16:18:43 +0000 (UTC)
>
>Hi all,
>
>I have been pondering the age old problem of launching in shallow
>water.  I am making new fibreglass MBT's for Gamma in a few weeks or
>so, I will increase the diameter to give me more free board.  The steel
>tanks are a bit to heavy and could use more volume.  Also the thruster
>tubes will be vectored in the new tanks.
>
>But that will only help with launching in shallow water a bit.  I am
>thinking that typically the water is deep enough for the sub alone
>without the trailer.  So my plan is to install an A frame on the
>trailer that can lift the sub when it is backed into the water.  The
>sub is light at this point, so lifting it off the trailer is easy and
>then the A frame tilts back dragging the sub off the trailer.  To load
>the sub, just drive it up to the back of the trailer and hook the cable
>to the lifting eye, then tilt the A frame forward, it lifts the sub and
>drags it onto the trailer.  I figure I will need a roller on the end of
>the trailer to help the sub slide ahead.
>
>Easy Peezy
>
>Hank
>
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