[PSUBS-MAILIST] Dive fail.

Sat Jul 11 11:44:32 EDT 2015

Glen,
I don't think towing is a problem at all, just mount them properly to allow the water to pass.
Hank--------------------------------------------
On Sat, 7/11/15, glen brown via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] Dive fail.
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Saturday, July 11, 2015, 10:51 AM

 Thanks
 Hank looks like saddle tanks the way to go,towing might be
 an issue though.Glen
 On Sat, Jul 11, 2015 at
 2:35 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:

 Glen,

 After converting to saddle tanks, I would never go back. 
 The stability is remarkable, and in my case very robust.  I
 used 100 lb propane tanks because I had them but also they
 are super tough and pretty light.  As for towing, I can not
 comment, but I can say that my top speed seems about the
 same.  More effort could have gone into mounting the tanks
 to be more streamlined, but I am very happy with the
 performance.  You can see them real well on my launch
 video.

 Hank --------------------------------------------

 On Sat, 7/11/15, glen brown via
 Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:

  Subject: Re: [PSUBS-MAILIST] Dive fail.

  To: "Personal
 Submersibles General Discussion" <personal_submersibles at psubs.org>

  Received: Saturday, July 11, 2015, 6:39 AM

  Hi

  JamesSaddle tanks sound good ,but i have wondered how

  much they will effect
  towing . Thinking as a option of an

  removeable fibreglass skin say 300mm from pressure hull

  forming some kind of

  deck.?regardsGlen

  On Wed, Jul 8, 2015 at

  12:54 PM, James Frankland via Personal_Submersibles <personal_submersibles at psubs.org>

  wrote:

  Hi Glen, If I were

  doing it again, I wouldn't bother with the standard
 MBTs

  at all.  I would make saddle tanks like on the

  "Nemo" sub.  For better surface stability
 and

  enclosed, so you don't burp air.    Im going to

  change my boat over the winter to have tanks like that

  instead, or probably as well.  Hank has done the same
 on

  his Gamma. Im not sure what you mean

  with the poly carb sheet attached to the top of the
 fore

  mbt?  Is this for a deck of some sort? 

   I paid a boatbuilding company to

  make the fibreglass tanks for my boat.  They made the
 plug

  out of a load of blue builders foam sheets stuck
 together

  and shaped that.  Then made the mould from that and
 layed

  the glass into it.  The same as Dan H did I

  think. regardsJames 

  On 8 July 2015 at 11:37,

  glen brown via Personal_Submersibles <personal_submersibles at psubs.org>

  wrote:

  Hi JamesI am busy with my k350 mbts at the

  moment trying to copy
 Dan's plug, mould, product. I was

  thinking of using a section of poly carb sheet attached
 to

  the top of my fore mbt.Any

  comments?

  Thanks

  Glen

  On Mon, Jul 6,

  2015 at 11:04 AM, James Frankland via
 Personal_Submersibles

  <personal_submersibles at psubs.org>

  wrote:

  Hi All, 

  I had a failure of a day on Sat.  I put the boat in,
 and

  it had a

  leak.  Not into the pressure hull, so it wasn’t a

  complete failure, but

  the leak was from the forward main tank.  The nearly

  useless windows that I put on the forward tank were
 leaking

  air.  Not just a little bit which I could have put up
 with

  it, but loads.  The boat was diving quicker than
 venting

  normally. 

   I pulled it out

  and went around tightening them up.  Put it back in and
 it

  didn't make any difference. It was strange as

  they have been perfectly ok before.  I think the problem
 is

  that on Friday while I was prepping the boat for diving,
 I

  went around and tightened the bolts.  It must have
 broken

  the seals.   Anyway. 

  I could

  have possibly winged it by running with a reduced main

  ballast, but as

  I was heading into the open sea, I thought I best be

  sensible and call it off.

  So

  It was in for about 10 minutes.  Pulled it out and was
 home

  by 8:30, very

  disappointed. Spent the

  afternoon sticking them in with Sikaflex and

  moaning. Hope these pics

  make it through.  You can just see the air spilling
 from

  the widows in the second picture and the boat is going
 down

  nose first. Kind

  RegardsJames 

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