[PSUBS-MAILIST] Listing solved

Sat Jun 18 11:30:27 EDT 2016

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.
>
> _______________________________________________ Personal_Submersibles
> mailing list Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20160618/15c9ce86/attachment.html>