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Re: [PSUBS-MAILIST] My "Hammerhead" 1atm sub design-



Brian,
 
I like the idea of a tilted cilinder. It looks very promissing. But i have a view remarks:
 
First the buoyancy tank. The top of it is at the same level as the top of the pressurehull. I think you should lower the tank to create some freeboard. It also has a bladder. Usualy the buoyancy tank (MBT) is open at its lowest point. During a dive it is completely filled with water. 
 
I see you have some very big viewports in mind. I am not an expert but i think that that is something that needs some attention. If i were you i would concentrate on the construction of the pressurehull.
 
Greatings,
 
Thijs Struijs
The Netherlands    
 
 
----- Original Message -----
Sent: Monday, April 11, 2005 8:28 PM
Subject: Re: [PSUBS-MAILIST] My "Hammerhead" 1atm sub design-

Hammerhead draft #2
 
 
Changes:
 
Thrusters: I reversed the thrusters so the fore thrusters are low and the aft thrusters are high. This increases the distance I am able to separate them which will improve maneuverability.
 
Buoyancy Tank: A foam/fiberglass section that will wrap around the pressure hull and extend aft to the end of the exterior frame. It will have a flat, textured top for walking on. The sides and end will curve down to create a depression in the underside that would have an air-bladder fitted to it (about identical to the BC worn by divers).
 
Trim Tank: A vented fiberglass shell with another air-bladder fitted inside it for pitch trim.
 
Air Tanks: Arranged fore-and-aft in two rows of three tanks. If I go with a single rear thruster, the tanks will be V'ed out at the top to allow for cleaner water-flow between them for the thruster. If I go with dual rear thrusters, the tanks will be stood upright side-by-side.
 
Argon Tank: to pressurize battery-box
 
Exo-Cage: very basic partial drawing of exterior cage to give approximate shape of sub.
 
Thoughts: I'm not sure I can get the sub's hatch far enough out of the water to allow wet entry/exit in anything but the best circumstances...yet. I'm also not sure how to power and steer 3-4 independent thrusters. I know how I want to do the human interface (SpaceOrb 360 is a PERFECT controller for this with some modifications). However I'm torn between electrical or hydraulic motors and servos, or some combination thereof.
 
Regarding the single-curve view port:  6' tall by 4' wide, curved onto a 3' diameter cylinder along the vertical axis. One horizontal support in the center, and two equi-distant vertical supports. Window edges and supports would be 2-3" widths of contact. This would divide the unsupported window sections into areas of less than 3' long by 1.3' wide.
 
Designed depth of the sub should be ~500' with a "rated" depth of 250'
 
Actually- I want to design it for 250psi. 250psi/14.7psi (one atmosphere)= ~17atm. 17atm x 33'(depth per atmosphere) = ~561'
 
I've sent an e-mail to a company that can supply 1/2" polycarbonate sheets in 8'x4' sections (or any smaller rectangular section) regarding its strength and ability to be bent.
 
Any feedback would be greatly appreciated!
 
In a message dated 4/5/2005 10:59:28 P.M. Eastern Daylight Time, mholt@ohiohills.com writes:
I've been thinking about this.  It sounds like a new version of
Bushnell's Turtle.
It's a great idea, mostly because with all that freeboard getting in and
out is
a bit less exciting.

Laying her on her side for thin water is a good thing, too.  One problem
I see often is that boat landings are simply too shallow for submarines.
But if the boat can lay on its side, float to the pier and then stand up
to be entered easily and safely.  (Of course, you might launch the
boat on its side with the pilot on board ....)

The single-curve window is fantastic.  What sort of bracing will you put
inside it?


Mike