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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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