[PSUBS-MAILIST] Re: viewports

[Ray Keefer <Ray.Keefer@west.sun.com>]

Hi Nemo,

Sorry, you didn't provide enough information. Actually if you gave me
all the parameteres I still couldn't tell you since I haven't studied the math.
However some of the parameters needed in calculating theoritical collapse
depth of a view port are:

Thickness:		thicker the deeper it will go
Diameter:		Smaller the deeper it will go
Annealed:		Was the material properly annealed between each
			machining step? If yes then it could go deeper.
Shape:			Cone? Disk? Square?
Seating surface:	The more seating surface the deeper.
Seat shape/design:	Cone is better for deep depth.
Hull penetration:	Kind of silly to have a viewport that will survive
			20,000fsw if the hull opening will only handle
			1,000fsw.

The best place I can point you to is the book:

Title:  Acrylic Plastic Viewports
Author: Jerry D. Stachiw

Pub.:   Marcel Dekker, Inc.
        270 Madison Avenue
        New York, NY  10016 
Pages:  
Year:   
ISBN:   
Cost:   $100
Synop.: Very detailed discussion into acrylic viewports. This topic
        was Jerry's lifes work. Complete with charts and tables
        derived at via imperical tests. Including destructive
        and cyclical testing.

Regards,
Ray

> From: Nemo8632@aol.com
> Date: Sat, 21 Oct 2000 13:53:32 EDT
> Subject: viewports
> To: ray@psubs.org
> Content-Transfer-Encoding: 7bit
> 
> How deep would you suppose a viewport of 9 inch thick plexi glass could go?