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I think the answer to your first question is a complex formula that can't be made simple with the exception of possibly using other subs as a guide. Most subs top out at between 2-5 knots underwater. You might check the archives because it's been discussed before but I don't recall the particulars. Re: Radio Frequencies; use whatever is required in the jurisdiction you are operating. In the US, marine band is required when operating off-shore or within intra-coastal waterways and if operating inland PSUBS guidelines recommend FRS frequencies. Some sub operators use CB frequencies inland. Re: elliptical vs sphere; do you mean a tank head? If so, they are usually purchased. A tank head can certainly be made up of segments welded together to form a specific shape (which saves weight) but the difficulty of doing so is not something I can speak to. Check www.psubs.org -> Resources & Reference -> Design Tools for software that can be used for various submarine components design. Jon On 2/27/2012 9:01 PM, Stratus Radix wrote:
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