<font color='black' size='3' face='Arial, Helvetica, sans-serif'><font class="Apple-style-span" size="3">I'm happy to hear that things are smoothing out. The MBT air trick is like magic, right? The old Perry boats had very elaborate variable ballast systems, custom under deck tanks, 4-piston pumps, all SS valving and plumbing, etc. And of course we used it to find that sweet spot you mentioned and then pretty much ignored it afterwards.</font>
<div><font class="Apple-style-span" size="3">Vance<br>
</font><br>
<br>
<div style="font-family: helvetica, arial; font-size: 10pt; color: black; ">-----Original Message-----<br>
From: hank pronk via Personal_Submersibles <personal_submersibles@psubs.org><br>
To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br>
Sent: Sat, Aug 9, 2014 7:28 am<br>
Subject: Re: [PSUBS-MAILIST] Gamma test dive<br>
<br>
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<pre style="font-size: 9pt;"><tt>
Vance,
I have to admit, you were right about how easy it is to operate. I also find it
more fun and interactive than using a VBT. The trick seems to be, to have the
weight of the sub in the sweet spot. I just got lucky and had the weight
perfect right from the start. I mean I had it calculated just perfect :-)
Now that I know this will happen, I will simply turn on my emergency air supply
and give a little shot of air to return to my set point. When the cabin
pressure has risen in past tests, I hit the air compressor for a couple of
seconds and it is corrected right away.
The onboard air compressor was a savior at the lake. I was able to refill both
hp tanks at the dock. I used four tanks of air.
I had zero leakage from windows ect. The hatch seal leaks at the very start but
stops right away when I dive. The hatch dogs need to be built up with some
weld. The dogs are new but the CT has grooves worn into the steel from being
closed a million times or so.
Hank
On Fri, 8/8/14, Vance Bradley via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
wrote:
Subject: Re: [PSUBS-MAILIST] Gamma test dive
To: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
Received: Friday, August 8, 2014, 11:20 PM
Hank,
I
might drop 2 inches of vacuum from deck temperature to
submerged. Call it 0.5 psi. It was always that cooling
effect that did it. I normally let the hull chill for 5-10
minutes then reset the zero point, as we used the barometer
for an eyeball pressure indicator for CO2 build up and draw
down (ran the scrubber about 15 minutes/hour).
Vance
Sent
from my iPhone
> On Aug
8, 2014, at 10:15 PM, hank pronk via Personal_Submersibles
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
wrote:
>
>
> Pete LOL I had it right, I am going to
bed--------------------------------------------
> On Fri, 8/8/14, hank pronk via
Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
wrote:
>
> Subject:
Re: [PSUBS-MAILIST] Gamma test dive
> To:
"Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
> Received: Friday, August 8, 2014, 10:13
PM
>
>
> Pete,
> sorry I meant 2
lb positive, can you tell I have been on the
> road for 6 hr and diving for 6 hr.
;-)
>
--------------------------------------------
> On Fri, 8/8/14, hank pronk via
> Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
> wrote:
>
> Subject: Re:
>
[PSUBS-MAILIST] Gamma test dive
>
To:
> "Personal Submersibles General
Discussion" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
> Received: Friday, August 8, 2014, 10:01
PM
>
>
> Pete,
> I have
Gamma about 2 lb negative I dump all
>
the
> air in the ballast tanks, then
start
> sinking. As I am
> sinking, I just give a
> swirt of air, with some practice I am
> able
> to stop and
hover. It is way easier than I though it
> would be.
>
>
Hank--------------------------------------------
> On Fri, 8/8/14, Pete Niedermayr via
> Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
> wrote:
>
>
> Subject: Re:
> [PSUBS-MAILIST] Gamma test
> dive
> To:
>
"Personal
> Submersibles General
Discussion" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
> Received: Friday, August 8,
2014, 9:46 PM
>
>
>
> Hank,
> How you stopping and
hovering. Are
> you
> weighted to neutral
> buoyancy?Are you
> riding the
> bubble?
Doesn't Gamma use
>
> forward motion and a dive plain for
depth
> control?
>
> Pete
>
>
>
-------------------------------------------
> On Fri, 8/8/14, hank pronk
via
> Personal_Submersibles
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
> wrote:
>
>
>
> Subject:
[PSUBS-MAILIST]
> Gamma test
dive
> To: <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>
> Date: Friday, August 8, 2014, 7:45
PM
>
>
Today I dove Gamma
> to
> 95
> feet in
> Kimbasket
> Lake
(bush
> Harbour) the
> visibility was
> awful.
>
>
>
> Maybe 2 feet at
best. Big mystery
> though, when I
dive
> to 95 feet, in a
> matter of 5 min the
>
pressure
> inside drops
> by
> 500 feet.
The pressure
>
>
stays right on
> perfect until
> I go deeper.
> My
>
theory, the water is glacier fed, very
>
>
> cold at depth causing the
> temp inside the sub to drop,
>
> creating
> negative pressure. Could that
> be
> it?
> Vance, did
>
that happen in the north
> sea?
> On a positive note,
> I can
> stop in
> the water Colum at any
> depth and hover. I
>
> can
> surface and stop at ten feet
> and
> hover.
>
Hank
>
>
>
>
>
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