Re: [PSUBS-MAILIST] submarine surface power/speed

[irox <irox@ix.netcom.com>]

Hi,

you can use the same calculation for submarines on the surface
as you can for full displacement hull boats and ships.
There are a number of hull speed calculators online.  I have
feeling you sub will not go over 10-12Knots on the surface,
no matter how much power you put in to it.

You might want to pick up some Naval Architecture books
since the vessel you are designing seems more like a large
boat or ship.  Something else that might help is the getting
a copy of the ABS rule book for subs, this may help you
understand the ABS hull calc spreadsheet.

Plan to spend a few $1000 on books if you are serious about
building such a large vessel.  There is going to be a
lot to learn.

Good luck!
  Ian.

 

-----Original Message-----
>From: Marc de Piolenc <piolenc@archivale.com>
>Sent: Oct 16, 2010 5:19 PM
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] thickness & Ribs
>
>Simple, maybe, but very tedious to answer. Perhaps you should grab a 
>copy of Hoerner's Fluid Dynamic Drag and get to work on the 
>hydrodynamics problems - surfaced and submerged - while awaiting help on 
>the pressure hull sizing problem from someone on the list.
>
>Best,
>Marc
>
>Archivale catalog: http://www.archivale.com/catalog
>Polymath weblog: http://www.archivale.com/weblog
>Translation services: http://www.proz.com/profile/639380
>Ducted fans: http://massflow.archivale.com/
>
>On 10/17/2010 2:58 AM, Yohnathan Aldana wrote:
>> Pretty simple question's
>>
>> How thick does the hull have to be if my sub is 60 feet long and the
>> main cylinder part is 40 feet with a diameter of 8 feet?
>> Also i would like to be able to dive 350m and crush depth to be 500m
>> thats all, and would i need Ribs to support the inside of the sub?
>> Last, with this size what type of diesel engine would i need to go 25
>> knots on the surface and, an electric motor, how much kw or hp would i
>> need to go 8 knots underwater?
>> The shape is literally a cylinder with half spheres on each end. I know
>> these are a lot of questions but it is _imperative _I know them, all of
>> them.
>>
>> And the abs excel sheet, does anyone know how to use it? It is very
>> vague on the instructions.
>>
>> John
>
>
>
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