[PSUBS-MAILIST] Progress report

Sun Aug 17 00:29:29 EDT 2014

That front trim tank will hopefully keep the nose up

--- 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] Progress report
Date: Sat, 16 Aug 2014 17:14:42 -0700

Brian,
You get first prize for thinking outside the box.  You would be well advised to split the MBT's or she will stand up.  It is not hard to keep up with the air compressing assuming you only have a small amount of air to start with. If you come for a ride in Gamma, I will show you what I mean.  
Hank

 Subject: Re: [PSUBS-MAILIST] Progress report
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Saturday, August 16, 2014, 5:40 PM

 Thanks Alec, That means a
 lot coming from you.  Your project was the first one that
 peeked my interest the very first time I found the Psubs
 web site.    The inside is actually baffled but not
 really on purpose.  There are ribs that are part of the
 frame work on the inside every 18 inches.  However I was
 worried that the air trapped in there would make for less
 control ( not being able to keep a neutral buoyancy
 condition)  because Ideally you want your soft ballast
 tank completely flooded, so I put holes at the top of the
 ribs so I could completely flood the soft ballast. 
 But listening to Vance tell about "riding the
 bubble" I'm really not sure what the best procedure
 would be.   I have bottom vents in two locations, the
 front vent I will probably cap off because if the front got
 too high air could potentially escape from
 there.   I don't want to get
 into a situation where the shrinking air bubble, while
 descending, sends me to the bottom before I can compensate
 for the reduction of the buoyancy
 .  Brian     

 ---
 personal_submersibles at psubs.org wrote:

 From: Alec Smyth via Personal_Submersibles
 <personal_submersibles at psubs.org>
 To:
 Personal Submersibles General Discussion
 <personal_submersibles at psubs.org>
 Subject: Re: [PSUBS-MAILIST] Progress report
 Date: Sat, 16 Aug 2014 10:34:34 -0400

 Hi
 Brian,
 I really enjoyed that
 because its in every way so radically different to any other
 design. I've always wondered how you would see anything,
 and that the sphere end might make a better bow for that
 reason, so the most interesting comment to me was that you
 intend to use go in one direction when diving and the
 opposite direction on the surface or mid-water. I never
 thought of that. My other big concern would be the free
 surface effect of such long MBTs. Are they baffled or
 sub-divided? If not, I'm afraid I'd you could have
 serious instability when MBTs are partially flooded, which
 is to say when diving or surfacing the boat. The instability
 could also end up putting the boat in a position such that
 the vents are no longer at the highest spot of the
 MBTs.

 Thanks,
 Alec 

 On Sat, Aug 16, 2014 at 3:25 AM, Brian Cox
 via Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:

 I did a video of the
 present state of my sub.  Been making some significant
 progress,  once the conning tower and hatch are on I'll
 feel a lot better - and the viewports.
  https://www.youtube.com/watch?v=luabNVU0QW0 Brian

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