Heh heh, I had a brain fart. Sorry
about that.
Rheal and Julie and I got together Sunday morning
for breakfast. As we were discussing subs and airplanes we mulled over
some Typhoon models I had brought along. 24 ft. seems about right for a
tandem seating arrangement.
My initial LOA for Magical Child was 15 ft.
While it's still a workable length in terms of my workshop, it leaves something
to be desired with regard to having decks to walk and lounge on. That
doesn't even begin to address the, um, aesthetic issue of being able to watch
your SUBMARINE decks submerge in front of your very eyes. A little like a
martini without the olive. I could, however, live with watching the water
splash over the canopy on the way down. That will be caught on video to be
sure.
What have you figured for windows? Any
sketches yet?
Rick L
----- Original Message -----
Sent: Friday, January 06, 2006 4:37
AM
Subject: Re: [PSUBS-MAILIST] Curved
surfaces and ballast release
Rick,
Nautilus was ruled out as impractical some time ago. I am drawing up a 25'
x 4' replica of a WW1 (one) design. 25' was the minimum I could aesthetically
get away with.
Joe
From: "Rick and Marcia" <empiricus@telus.net> Reply-To:
personal_submersibles@psubs.org To:
<personal_submersibles@psubs.org> Subject:
Re: [PSUBS-MAILIST] Curved surfaces and ballast release Date:
Fri, 6 Jan 2006 03:23:49 -0800
Joe, for a pilot you sure are catching on
quickly. This isn't exactly your turf, but, so far you've made more
sense than some of the stuff I've seen. I get the impression you
actually want to solve some problems and not just ramble on about
concepts. :-)
I hear you, lot's of
similarities. I am envisioning the longitudinal supports (minor stringers)
only to maintain a fair surface since the framing is in essence, a plug.
Still, I would like to not have to do that, but I cant see how to laminate
the thin layers without them?
But, longitudinal support (major
stringers) in addition to the monocoque
skin is also length and weight dependent is it
not?
OK, now - the longitudinals. If the skin
is thick enough they should be self forming around the bulheads. I'll
be using so many of them that the skins really will have no place to go than
around the edges. Very thin sheets would require skantling for
sure.
Any ambient ply design is going
to need a "boatload" of lead. You and I need to be careful about structural
integrity with regard to the concentrated ballast (and it's going to be a
lot!). I don't think I could get away with purely monocoque at my length and
be comfortable in any kind of wave action.
I'll be keeping my lead right under my
seat. I'm visualising the cockpit/lead setup as a balloon/weight
analog. The heavier built cockpit will take the stresses
entirely.
As you so aptly pointed out, in a seaway the
changing stresses could lead to difficulties. Magical Child's twin
keels (mainly for bottoming) will run from far aft right up forward.
Inside the nosecone I'll be using bracing in the form of ply sheet to take
hard wave action. I'll be transferring the loads (on the inside of
where the external keels meet the hull) adjacent to the twin
keels.
A 15 footer like MC has a completely different
set of stressors than your Nautilus. Same concept, but the
load!!!
Clear my mind, will you? Are you still
envisioning that 35 footer? Or have you actually decided to downsize
for the first one?
Rick L
----- Original Message -----
Sent: Saturday, December 17, 2005
2:20 PM
Subject: Re: [PSUBS-MAILIST] Curved
surfaces and ballast release
Rick,
'Now, I may be a little more concerned
with the cockpit. I'll have to think this one
out."
As I work this out on paper I am seeing
either a short, squatty and lighter caricature of a military
boat, or a longer truer to scale but more heavily constructed version with
a tiny crew module and almost all flooded fairings. As they say in Texas,
"big hat no cattle"!
Truly a lot of details to consider.
Joe
From: "Rick and Marcia" <empiricus@telus.net> Reply-To:
personal_submersibles@psubs.org To:
<personal_submersibles@psubs.org> Subject: Re:
[PSUBS-MAILIST] Curved surfaces and ballast release Date: Sat,
17 Dec 2005 12:13:00 -0800
Joseph - it seems we're looking at building
the same boat!!!
I'm avoiding longitudinals and sticking
with a monocoque. I agree with all the transverse frames
(bulkheads) being the main support or guides for the epoxied
skins. Magical Child (i.e.: Typhoon) will have simple curves
(arcs) both port and starboard, deck and bottom. The simple
curve in the cold moulds will be sufficient support; IMHO, the
longitudinals are extra work. Longitudinal strength comes from the
skin.
Now, I may be a little more concerned with
the cockpit. I'll have to think this one out.
Temporary support while the epoxy cures
along the bulkhead edging will come from wrap-around straps or even
cinched up rope (trucker's tightener). A good 60 grit sanding
along the bulhead edging will give some tooth for the epoxy to
hold.
I'll be using rather thin (1/4
inch) ply for bulkheads - should work as long as they're
filleted with epoxy and glass strips. Cockpit bulkeads will be
heavier.
Rick L
----- Original Message -----
Sent: Saturday, December 10, 2005
6:14 AM
Subject: [PSUBS-MAILIST] Curved
surfaces and ballast release
The recent discussion regarding
spherical mock-up construction has me taking another look at something
I had in mind.
To form the curved surfaces of my
ambient marine ply design, I have in mind epoxy laminating thin
layers of ply over longitudinal supports notched into traditional
transverse frames. I need those frames to baffle a whole lot of free
flooding spaces and soft tank spaces anyway, so they have to form
the hull exterior. (The crew compartment is modular and hidden from
view and structured to contain the lead ballast).
As I apply this to my 3d model, I see
a lot of material taking up a a lot of displacement volume and
therefore requiring additional compensation ballast.
Suggestions on how to cut down on
the framework volume and still maintain fair curves with rigidity
would be greatly appreciated.
A second question is regarding
mechanisms for release of a heavy lead keel. If someone could point me
to examples to look at?
Joe
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