Re: [PSUBS-MAILIST] electromagnetic drop weight mechanism

[MerlinSub@t-online.de]

Seperate the diver chamber from the rest of the sub 
for a pressure tight lift to the surface is another.. 

smile.. vbr Carsten 

<JimToddPsub@aol.com> schrieb:
> Alan,
>  
> They're not actually dynamite; they're usually referred to as explosive  
> bolts or fasteners.  They're designed with an explosive charge inside them  
> and a weak point to sever when the explosive is detonated by a remote  
> electrical switch either manually or computer controlled.  They've been  used to 
> separate one stage of a rocket from another, and I know they've been  proposed 
> for separating an escape module from another vehicle.  Some type  of 
> explosive fastener must be used to release the ejection seat before it is  
> launched out of an aircraft.
>  
> One application I could see for them in subs would be to jettison control  
> arms, a motor, or some other appendage that got tangled in cables or  debris.
>  
> Jim
>  
>  
> In a message dated 1/15/2012 2:48:45 P.M. Central Standard Time,  
> alanjames@xtra.co.nz writes:
> 
> Thanks Vance & Phil,
> Good to have living sub encyclopedias in the group.
>  Carsten, am not sure what dynamite bolts are but it sounds like  that if
> you bought the big ones you might be sinking rather than floating.
> Alan
> ----- Original Message ----- 
> 
> From:  _Phil  Nuytten_ (mailto:phil@philnuytten.com)  
> To: _personal_submersibles@psubs.org_ 
> (mailto:personal_submersibles@psubs.org)   
> Sent: Monday, January 16, 2012 8:15  AM
> Subject: Re: [PSUBS-MAILIST]  electromagnetic drop weight mechanism
> 
> 
> All:
> I agree completely with Vance on the electromag  weight drop question. The 
> rotation cam-over-center or latch-pivot   operated by a thru' hull shaft has 
> certainly stood the test of time. There  are a number of variations 
> including a layered weight plates system  with alternating keyed slots so you can 
> drop just enough to make you  buoyant and so on - but I believe the KISS 
> principal very much applies  here.
> Phil
> 
> ----- Original Message ----- 
> From:  _vbra676539@aol.com_ (mailto:vbra676539@aol.com)  
> To: _personal_submersibles@psubs.org_ 
> (mailto:personal_submersibles@psubs.org)   
> Sent: Sunday, January 15, 2012 6:03  AM
> Subject: Re: [PSUBS-MAILIST]  electromagnetic drop weight mechanism
> 
> 
> There are substantially more cons than pros here. Many of the deep vehicles 
>  and early attempts used this, including the old Deep Jeep, Alvin, and the  
> Trieste. Read up on any of them and you will find instances where an  
> unexplained short dumped everything and sent them to the surface.  Expensive and 
> wasteful is what it is. Especially Trieste, which had its  BATTERIES held on 
> sloping rails (they were deck mounted, originally) and  lost them ALL due 
> to a very minor short circuit in the cabin. Lost them  all at 15,000 feet, 
> that is. My friend Mike Stahle was the chief pilot and  then crew commander 
> for that thing, and they hated those electromagnets.  Hated them! Necessary 
> for them, of course, but for us, a penetrator is  just too dead easy to 
> install--and bullet proof. Turn handle, drop  weights. Don't turn handle, take 
> weights home. Simple.  
> Vance
> 
> 
> -----Original  Message-----
> From: Alan James <alanjames@xtra.co.nz>
> To:  personal_submersibles <personal_submersibles@psubs.org>
> Sent:  Sat, Jan 14, 2012 8:46 pm
> Subject: [PSUBS-MAILIST] electromagnetic drop  weight mechanism
> 
> 
> Hi all,
> Haven't designed my drop weight mechanism  yet, but are toying with the
> idea of using electromagnets.
> Was looking at some gate holding magnets that  had a holding force of 1200 
> lb &  
> a draw of only 500mA off 12V. They were a tad  expensive so will look for 
> an alternative.
> The positives I see are that the system  would be easy to put together, 
> (possibly with  multiple 
> magnets for making  the weights more manageable), & you could drop your  
> weights very quickly.  The negatives are you would not want to turn the 
> power  off before 
> you were on land & you would need a  system of locking the weights in place 
> for transport 
> or alternatively remove them.
> Is this system used elsewhere, any  thoughts??
> Alan
> 
> 
> 
> 
> 
> 
> 
> 




************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003.  Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.

If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
	removeme-personal_submersibles@psubs.org

Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.

PSUBS.ORG
PO Box 53
Weare, NH  03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************