Re: [PSUBS-MAILIST] trim ballast

[Charles Perkins <chuck@memetech.com>]

How about a heavy chain? You could use sprockets and a guide to move it 
from a locker at the nose to a locker at the tail.

Does anybody make a chain out of lead?

A motorcycle-style chain would be easier to push and pull than a 
anchor-style chain.

Just a thought.

Chuck

On May 24, 2004, at 10:08 AM, DJACKSON99@aol.com wrote:

> Brian
>  
> I have some experience with grain augers.  And that setup would work 
> well only the delivery end allowed the shot to drop into a hopper.  
> The augers are not designed to deliver high output pressure.  In order 
> to push material, especially oxidized shot with lots of friction would 
> need a lot of torque and a heavy screw.  Also lead shot like 
> grain would freely flow downhill through an auger once the pitch was 
> steep enough. So if you got the nose too low, all of the shot would 
> flow forward.
>  
> Do you not have room from a lead block or cylinder?   Is this system 
> going to be dry?  And how much weight do you need to move.  I am going 
> to move about 1 ton, but I'd think you would need to move only 40 
> pounds or so.  You could then use a cable system or a "lead screw" 
> (see http://www.velmex.com/manual_lead_screws.html ;) To move it with a 
> lot less torque.
>  
> Best Regards,
> Doug Jackson
> www.submarineboat.com
>  
>  
> In a message dated 5/24/2004 11:37:09 AM Central Daylight Time, 
> ojaibees@ojai.net writes:
> Hi All,  
>  
>                    I have an idea for a trim ballast system.  It  
> basically consists of a long pipe, probably stainless 1" dia, which 
> would run the length of the sub.  Running through the inside of the 
> the pipe would be a long screw which, when activated would turn either 
> clockwise or counter clockwise, kind of like a grain silo system. The 
> screw would move lead shot either fore or aft depending on where you 
> need to trim  the sub.  At each of the ends there would be a space 
> where the lead shot would accumulate but with a slight pressure  
> (possibly from a spring )  kind of like a piston arrangement so that 
> the lead shot would always be availible to feed in which ever 
> direction you would need to balance.   Does anyone know if lead shot 
> would move like that?  It would definatly have to be geared very low. 
>   
> Brian





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