[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [PSUBS-MAILIST] Curved surfaces and ballast release



joe
 
    your plywood is adding boyancy at a rate of about 30 lbs per ft^3
 
displacement = total exterior volume of the structure - free flooding volumes
since plywood floats the more you use the more it will float.
 
rick m
----- 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
 
 
************************************************************************ ************************************************************************ ************************************************************************ The personal submersibles mailing list complies with the US Federal CAN-SPAM Act of 2003. Your email address appears in our database because either you, or someone you know, requested you receive messages from our organization. If you want to be removed from this mailing list simply click on the link below or send a blank email message to: removeme-personal_submersibles@psubs.org Removal of your email address from this mailing list occurs by an automated process and should be complete within five minutes of our server receiving your request. PSUBS.ORG PO Box 311 Weare, NH 03281 603-529-1100 ************************************************************************ ************************************************************************ ************************************************************************