RE: [PSUBS-MAILIST] FW: New Submersibles Launched

Hi Glen,

Basic stress is P x r/t . ie Pressure times Radius of vessel divided by the thickness give or take. With ¼ inch plate this is 11232 psi and with 6mm it is 11887. This is 5.83% more stress. Both of these are well below acceptable ASME allowable stresses of 15000-18000. It is the buckling under external pressure which is the concern for subs. The ribs are conservative. Check with the hull calculator. You have several alternatives without getting stressed out over metric versus imperial. I have been fighting metrication for years as I figure I am too old to change. The other alternative is to go with higher tensile plate. 516 Grade 70 has a minimum stress which if you look at the material test sheets is generally exceeded by 10-20% in actual strength. Also ASME has a safety factor of 4 times generally and under FEA it is 1.5 times. As you are not getting the hull certified you can creep around the edges. If you are getting a design and construction certified then you have to abide by the rules to the last bit. Hope it helps, Hugh

Pressure	P	156	156
Radius	r	18	18
thickness	t	0.25	0.236

Stress		11232	11887.2

			5.83

From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of glen brown
Sent: 12 September 2008 19:02
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] FW: New Submersibles Launched - September 2008

ANY PSUBER

Inches to metric .After 1 month of trying to get my material from countless suppliers to build my k350 in south Africa a metal producing country I am starting to get thoughts of giving up when I mention inches it seems to close ears when I convert to metric i.e. 1/4''=6.35mm(we only get 6mm or 8mm) and the list goes on

HELP.any suggestions will be most welcome.

Glen

----- Original Message -----

From: Brent Hartwig

To: personal_submersibles@psubs.org

Sent: Thursday, September 11, 2008 10:57 PM

Subject: RE: [PSUBS-MAILIST] FW: New Submersibles Launched - September 2008

It would be interesting to see what type of Li-Ion batteries they use.

Your resident pipe dreamer ;)'

Regards,
Szybowski

From: hc.fulton@gmail.com
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] FW: New Submersibles Launched - September 2008
Date: Thu, 11 Sep 2008 08:43:19 +1200

Hi Guys,

This is a fancy sub newly released.

What do you think?

Hugh

During the last three years, significant investments were made in the engineering, development and testing of the C-Quester concept. Therefore, U-Boat Worx is now very excited to present a new and exciting generation of C-Quester Submersibles that combines a full Germanischer Lloyd classification with our experience, knowledge, and enthusiasm.

The newest submersible to be launched is the brand-new three-person C-Quester 3, which will be followed by the reinvented two-person C-Quester 2.

Concept and Technology

Uncompromisingly, the basic unique characteristics of the previous C-Quester Submersibles will still be maintained in the new C-Quester including the Underwater Boat Concept.

Further expanding our competitive advantages, we have also introduced increased endurance with Lithium-Ion Technology, Extended Depth Capabilities up to 100 metres, increased surface speed of 4 knots, and Easy Modular Maintenance, just to mention a few.

Who are our C-Quester customers?

The C-Quester 3, with low operational costs, forms a solid business opportunity for a charter operation (resorts, luxury hotels, yachts). Also for personal use, the C-Quester 3 is the choice of the individual, who wants to share the world below the surface with friends and family.

The C-Quester 2, with limited size and weight, represents the ideal Superyacht submersible. Moreover, the C-Quester 2 brings the underwater world within reach of private individuals that are looking for an advanced and easy-to-handle submersible.

Availability

A limited number (5) of certified C-Quester 3 hulls are now available to order, with open delivery slots in spring 2009. The C-Quester 2 hulls can be secured with open delivery slots in the summer of 2009.

We invite you to join us in exploring the new boundaries of the new C-Quester Submersibles. You are most welcome to visit our facilities in Breda, The Netherlands. We also invite you to meet us at the Monaco Yacht Show (24-27 September 2008) to get acquainted with our new U-Boat Worx product family.

To learn more about the cutting-edge C-Quester Submersibles you can download our brochure (PDF-file) and pricelist (PDF-file), or check out our website: www.uboatworx.com.

Feel free to directly contact Erik Hasselman (Sales & Marketing) at erik@uboatworx.com or +31 (0)76 5713096 to discuss further possibilities.

We look forward to diving with you in the near future.

Best regards,

The U-Boat Worx Team

U-Boat Worx B.V.

The Netherlands

Phone: +31 (0)76 5713096

Email: info@uboatworx.com

Internet: www.uboatworx.com

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