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I am contemplating flooding the pilots
foot well as a variable tank but, as Dan pointed out, things can get a
bit nasty buoyancy / control wise in an ambient.
Hi, Joe, et al . . . I'm curious about the foot-well thing
and the nasty buoyancy thing. Could you elaborate a bit?
The only reason I can see for flooding a footwell is to
reduce the amount of required compensating air into the cockpit, in other
words, to save compressed air. Many moons ago, before I decided on the reg
compensation scheme, I considered using a kayak skirt to keep the wet sloshing
surface in the cockpit from splashing around (unlike the Sportsub, I wanted my
boat to incline like a "real" sub). Everything up to the skirt would be
wet, everything abouve would be dry. Kent Markham with a kayak
skirt.
There seems to be a widespread feeling in the list
that ambients will have buoyancy issues. Boyle's Law will only come into
play if you have an open bottom in your cockpit.
Maybe I'm missing something here.
Rick L
----- Original Message -----
Sent: Thursday, March 02, 2006 7:31
PM
Subject: Re: [PSUBS-MAILIST] Free
Surfaces solution!
Bill,
I see what you are saying. Sportsub is clever that way and even smarter in
their placement of the entry. But, I will be lucky to have a few inches
under the keel dockside at most ramps here.
If I land on the bottom, I have to balance her on her keel
with little bursts to the saddle tanks like a BC. This makes ever leaving the
boat an absolute no no. I won't be doing twin keels because of
increased wetted surface...that and the lower hull peppered with limber holes
as is, would be a bit much to ask of any decent surface running.
Also, the discussion regarding "fine tuning" of the numbers has me
re-thinking things a bit. My deciding to design in the ability to leave
"snorkel depth" also leaves behind the hydrodynamic / energy advantage of the
14 hp diesel, and its hull effect. That gives me the reserve to force
her under even if the boat were significantly positive, how much
positive?...(me not know). I lose that advantage as soon as I would
break away from the surface and that makes things a bit tougher for me.
I am contemplating flooding the pilots foot well as a variable tank but, as
Dan pointed out, things can get a bit nasty buoyancy / control
wise in an ambient.
Let's see what develops.
Joe
From: "Akins" <lakins1@tampabay.rr.com>
Reply-To:
personal_submersibles@psubs.org
To:
<personal_submersibles@psubs.org>
Subject: Re:
[PSUBS-MAILIST] Free Surfaces solution!
Date: Thu, 2 Mar 2006
21:00:49 -0500
Glad to help Joe.
See how the exact same "center board trunk"
idea can be used to create an open bottom hatch that the water level is
under by a few inches
and therefore would not slosh into the ambient
boat? No need for a hatch if you want to cut down on time and costs
and don't plan to be
sitting outside atop the sail. Just use your
trunk hole to enter and exit the sub. One thing to remember if using this
for going out diving from the sub.....
remember you were already pressurized at
whatever depth the sub was at and for that time. Now if you go outside and
dive deeper as a diver,
you must calculate your previous compression
pressure and its time and then treat your outside dive just like any other
repetitive scuba dive so
you will not require deco. Even if you did
decide to put in an upper sail hatch, or deck hatch, it would still be very
nice to have a big hole in the floor
that you can just jump out of the ambient sub
thru.
Bill Akins.
----- Original Message -----
Sent: Thursday, March 02, 2006 6:40
PM
Subject: Re: [PSUBS-MAILIST] Free
Surfaces solution!
Yes you did Bill but, I didn't put 2 + 2 together at
that moment! I was still thinking of a flat plane.
Thanks so much!
Joe
From: "Akins" <lakins1@tampabay.rr.com>
Reply-To:
personal_submersibles@psubs.org
To:
<personal_submersibles@psubs.org>
Subject:
Re: [PSUBS-MAILIST] Free Surfaces solution!
Date: Thu, 2
Mar 2006 17:30:03 -0500
Hi Joe.
Remember when I told you to partially
enclose the ballast tanks to prevent not only burping but also to
aleviate your free surface problem and just leave a small hole in their
bottoms for ambient operation?
Looks like you came to the same
conclusion.
Bill Akins.
----- Original Message -----
Sent: Thursday, March 02, 2006
12:08 PM
Subject: [PSUBS-MAILIST] Free
Surfaces solution!
I really did not want to seal off the soft tanks
completely in my ambient design to keep the "free surfaces" in
check. I found the solenoid flood valves unnecessarily
complex for my application, plus the issue of access and
maintenance.
This is truly bizarre and a testament to the function
of this list. Not to encourage off topic discussions but...
The rocket discussion made me think about the
pyrotechnics of solid rocket motors, which made me think of flares,
which made me think of the time years ago, Freddy got drunk and set
his sail cover on fire one July 4th with a hand flare.
That boat had a centerboard
trunk!!
Hmmm, centerboard trunk!!....led me to
this solution in five minutes!
You guys are just bursting with design ideas!!!
:)
Thanks
Joe
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