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Re: [PSUBS-MAILIST] K350 salvage concept
Hi Lawie,
thanks for the extra information.
I think your thoughts on moving the drop weights below the main hull
along the center are correct. This will lower the center of gravity
and increase the righting force that they provide. In fact, moving
all the heavy/negatively buoyant components (batteries, drop weights,
static weights, etc.) to as close to the center and as low down as
possible would be a good idea.
Are the vertical fins at the rear controllable rudders? If so, maybe
consider moving them to aft of the thruster, this will allow you to
maneuver at lower speeds.
Using a spreadsheet is probably quicker/cheaper way of calculating
the displacement, weights and balances rather than building a model.
Building a model is a good idea, but maybe do a few iterations in
a spreadsheet first. You can easily calculate the weights and volumes
of the components. Then assign each component an x,y,z value with
0,0,0 being approximately the center of the sub and calculate the
center of gravity, center of buoyancy and moments at various pitch
and roll angles (with and without the drop weights attached to
make sure it doesn't float upside down after the drop weights have
been released.
Good luck!
Cheers,
Ian.
-----Original Message-----
>From: lawrie-psubs@environics.com.au
>Sent: Jan 22, 2011 3:02 AM
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] K350 salvage concept
>
>Hi Ian,
>
>Thanks for the comments and suggestions.
>
>I will try and answer a few of the questions.
>
>The dimensions are K350, however I changed the conning tower to accept a
>dome.
>
>The wings are to provide a lot more bounancy for both salt water and
>fresh, given you may wish to bring something up from the sea bed.
>
>Once I get to doing the CAD on the internals, the idea I have for shift
>balance fore and aft is two pairs of oil tanks, one in each wing to ajust
>weight using an oil pump.
>
>Drop weights within the wings running longitudinal. They are not detailed,
>however thinking it may be better to have one weight mounted below the main
>pressure vessel at center.
>
>The two forward motors do rotate, and the tunnel section is to allow
>thrust in the horizontal to assist the rudder at slow speed. I throught
>about bring the wing further in, however I felt it would an advantage in
>terms of tieing off against a boat. In other words, so that the out part
>of the wing protects the forward motors as well as bumping up against a sub
>sea wall port and starboard.
>
>The battery pods are much longer than the K350, and I haven't worked out
>the lift accuracy. The estimate is about 75 kgs each wing to give a lift
>of 150 kgs. This is above that required to get the water line about 100 mm
>below the deck line so that the viewport is sufficiently above the water
>line.
>
>The design has one main motor for primary thrust, and the end caps are
>conventional, however the drawing shows the fairing to make the center
>section more streamline.
>
>Its a little futuristic longing, but I figure why build an ugle looking
>boat.
>
>My next step after more cad is to build a 1/4 model to work out actual
>displacement and where the weight needs to be disturbuted. You may notice
>the batter pods are a little to aft where the wing sections are thickness.
>
>The wing sections are their deepest are about 400 mm.
>
>There are other concept drawings, but I really like this one because at
>the heart of the vessel is tried and true K350 pressure hull.
>
>More drawings posting soon.
>
>I really appreciate any help and the comments.
>
>Best regards, Lawrie.
>
>
>
>
>
>On Sat, 22 Jan 2011 05:19:41 -0500 (EST), irox <irox@ix.netcom.com> wrote:
>> Hi Lawie,
>>
>> nice drawings!
>>
>> This looks like a K-250 rather than a K-350 (going by the dome).
>> Two things which would be very useful for understanding the
>> design changes would be a general layout sketch (i.e. ballast
>> tanks, operator positions, drop weights, batteries, etc..) and
>> a description/write-up of the changes and features.
>>
>> But here are my comments just based on what I see in the
>> concept drawings.
>>
>> - Drop weights? The K-350 had two 250lb drop weights,
>> I don't see any on the drawings.
>>
>> - How much soft ballast? Assuming the pontoons are soft
>> ballast tanks, how much lift do they provide?
>>
>> - I assume the VBT inside the hull, like a K-250?
>>
>> - Can the side thrusters be rotated to provide vertical thrust?
>>
>> - Maybe moving the battery pods (assuming they are battery pods)
>> closer together would provide better surface handling/stability.
>>
>> - Where do the air tanks go?
>>
>> - I am not sure the "winglettes" are doing much other than
>> disrupting the thrust from the side thrusters.
>>
>> Cheers!
>> Ian.
>>
>> -----Original Message-----
>>>From: lawrie-psubs@environics.com.au
>>>Sent: Jan 21, 2011 10:51 PM
>>>To: personal_submersibles@psubs.org
>>>Subject: [PSUBS-MAILIST] K350 salvage concept
>>>
>>>
>>>
>>>Hi all,
>>>
>>>With things a little quiet with the local floods, I have had
>>>some time at night to work on a concept using the standard K350 pressure
>>>vessel.
>>>
>>>I hope you like. Comments, critisms, and improvement suggestions
>>>welcomed. I am going to kept working on this particular concept.
>>>
>>>What do
>>>you think?
>>>
>>>http://www.psubs.org/projects/1280105118/k350-salvage/ [1]
>>>
>>>
>>>Best regards, Lawrie.
>>>
>>>Links:
>>>------
>>>[1]
>>>http://www.psubs.org/projects/1280105118/k350-salvage/
>>
>>
>>
>>
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