[PSUBS-MAILIST] Listing solved

Sat Jun 18 20:45:37 EDT 2016

Hank, I was thinking it might be to early in the dive season to test out
your escape pod. For that event you defiantly need video!!
On Jun 18, 2016 10:06 AM, "hank pronk via Personal_Submersibles" <
personal_submersibles at psubs.org> wrote:

> Hi David,
> My thrusters would not have the power to stop that assent.  Maybe DW
> thrusters could do it.  I will fix the problem and it won't happen again.
> It is dangerous to dive so heavy because the drop weight may not be heavy
> enough to surface the sub if out of air.  Oh wait a minute,, I have
> an escape  vehicle with a vertical orientation stability bladder ;-) ;-)
> Hank
>
>
> On Saturday, June 18, 2016 9:30 AM, David Colombo via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hank, sounds like quite a ride. Do you think you could have controlled the
> ascent with your thrusters? Maybe Cliff could write some plc code for
> rotational control with the use of accelerometers to automatically control
> the thrusters in such an event.
> David Colombo
> On Jun 18, 2016 5:25 AM, "hank pronk via Personal_Submersibles" <
> personal_submersibles at psubs.org> wrote:
>
> Alan,
> I am using air water valves for venting only.  I have had  great success
> with similar on  my under water log salvage ROV.  I am in fresh water so
> not an issue for me.  I have not seen Vance's design but assume you need an
> air line to each valve and a means of regulating air pressure to the
> valve.  I looked at using air but it was getting complicated.  I thought
> ComSub had solenoid valves? No?
> Hank
>
>
> On Saturday, June 18, 2016 5:58 AM, Alan James via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Hank,
> what sort of solenoids are you using? Are they for both filling & venting?
> I have solenoids for both on my ambient & use them in salt water, but after
> pulling some apart I wasn't that happy that they would last the distance.
> I remember Hugh saying he hadn't had much luck finding a descent
> solenoid valve to do that job, & he imports & makes valves.
> I am going to use Vance's pneumatically operated top hat valve design.
> Alan
>
>
> ------------------------------
> *From:* hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Saturday, June 18, 2016 11:31 PM
> *Subject:* Re: [PSUBS-MAILIST] Listing solved
>
> Hi Brian,
> The sub was spinning like when a helicopter loses its tail rotor.  It
> seemed pretty fast also, I am guessing four revolutions but I was't
> counting.  I have never experienced that, it was very weird.  Its funny
> though because in the few seconds it took to surface I said to myself "I
> wonder if this is what Alec was talking about"  because he had an issue
> with Snoopy rotating but under different circumstances.
> Hank
>
>
> On Saturday, June 18, 2016 2:58 AM, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Hank,  When you say you did " 4 full rotations"  Do you mean rocking from
> one side the other on the way up?   What maximum angle from center do you
> estimate you were swinging?  If I'm understanding you right.
>
> That extra air was no doubt compressing on the way down , making you
> accelerate.
>
> 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: [PSUBS-MAILIST] Listing solved
> Date: Fri, 17 Jun 2016 20:40:55 +0000 (UTC)
>
> Today I dove Gamma to 80 feet and the cause of my list became clear.
> First off I extended my bottom vent tubes on the front MBT's and that fixed
> the list once surfaced.  But the real problem was quite scary.  It turns
> out that I am not evacuating all the air from my MBT's because there is not
> enough height difference between the vent valve and the tanks.  I added
> about 200 lbs more weight than my calculations called for and that
> compensated for the trapped air.  Now, I am no math wiz, so I chalked it up
> to a math error.   When the sub is on an angle the air does not escape
> fully.  I did my dive and vented till the sub was under and let her sink.
> I was not paying attention to the sink rate because I expected it to sink
> slowly thinking all the air was out of the MBT's.  I was more concerned
> about the first time diving after all the modifications I have done.  I
> have not done a deep test yet.  Well I hit the bottom like a ton of bricks
> and Gamma went into the mud pretty deep I guess, because I had to use up
> 500 psi of air get it loose from the bottom.  Once it was free, I was a
> rocket heading to the surface and the sub did about 4 full rotations on the
> way up and then It breached.  Man that was freaky, so now I know the sub is
> too heavy because the air is trapped in the MBT's.
>   There is an easy solution, I will mount manual vent valves to the tanks
> and rotate them with linkages from the main vent valve.  I will leave the
> existing lines in place to get the air into the tanks but the extra valves
> will do the venting as well as the original vent valves.
> Hank
>
> Oh ya and my hip waders had another leak.
>
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