[PSUBS-MAILIST] Shackleton stability spreadsheet

[Alec Smyth via Personal_Submersibles]

Oh, first mistake found already. The "design objectives" sheet was not
supposed to be there, it's about a decade out of date and irrelevant to the
spreadsheet. Here's a version without it.

On Wed, Aug 3, 2016 at 11:24 AM, James Frankland via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Thanks for sharing alec.  I will check it out later.
>
> regards
> James
>
> On 3 August 2016 at 15:41, Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Hi everyone, here's the spreadsheet I used in my convention presentation.
>> Please be mindful this is highly questionable math from a thoroughly
>> unqualified source. It contains design-specific formulas that will not work
>> for other boats. It is, in short, completely unwarranted and your designs
>> should not be based on it without considerable rework. But you might have
>> some fun just noodling around. When you find errors, please do point them
>> out.
>>
>> I recommend playing with the values on the Operational Dash sheet for a
>> while first to get a feel for how this works, before trying to figure out
>> the logic on the Calculations sheet. To explain some of the variables on
>> the dash:
>>
>> Shackleton has up to four large floats arranged in a ring at the stern
>> end of the hull, and you specify the number of floats with the variable
>> "Stern float ring." Similarly, "Fifth stern float" is just a 1 or a 0 and
>> refers to the sternmost float of all if used, and "Num forward floats" is
>> the number of much smaller floats mounted on the forward half of the boat.
>> The basic idea is that you weigh your passenger and pilot, and pick a
>> combination of floats, weights, and weight tray position that gets you
>> approximately neutral and trimmed. The boat has no VBT.
>>
>>
>> Thanks,
>>
>> Alec
>>
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>>
>>
>
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