[PSUBS-MAILIST] sub launch

Mon Oct 17 21:37:55 EDT 2016

Sean,That is very feasible  at least on paper.  I have thought about that for years but never pulled the trigger.  It is surprising how easily a trailer will float.  I don't know if you saw the performance at the Washington convention, when Steve was backing in my brand new sub trailer and it was floating.  The frame tubes and tires were enough to float it.  I had to drill holes in the frame after that so the darn thing would sink faster. 
Brian,  the sub would have to be floating to get to the cantilevered position on the trailer.  But if the trailer had rollers and a beavertail, then a long reach hydraulic cylinder could both push it off and pull it on.  Pity, I just gave a hiab crane away that had a long two stage cylinder on it.Hank 

    On Monday, October 17, 2016 6:29 PM, 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 atelescopic extension tube between the truck & trailer. Like the traditionalmethod but a lot longer. It would be easy to make; just 3 tubes of varyingdiameters, 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 wouldalso 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

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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 downon the sub, just to aid buoyancy for tricky launching.   Ok here's another idea that you are well capable of implementing..... youhave a floating trailer with pontoons down either side & twin outboards on theend 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

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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 morebeefed up version would help. ( 2 parts to the video)https://m.youtube.com/watch?v=47y0KNSvUgsAlan

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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 PeezyHank_______________________________________________ Personal_Submersibles mailing list Personal_Submersibles at psubs.org http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles   _______________________________________________
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