Re: [PSUBS-MAILIST] electromagnetic drop weight mechanism

[MerlinSub@t-online.de]

Hi Alan, you must see the the Holywood Movie "Underwater around the world"

http://en.wikipedia.org/wiki/Around_the_World_Under_the_Sea

http://www.youtube.com/watch?v=3yGkXCe1H2U
http://www.youtube.com/watch?v=3MW7WJoVydw
http://www.youtube.com/watch?v=044GjRUH0Uk

In the last 5 minutes of this great movie you can see the usefull use of dynamit INSIDE a civil submarine.. 

http://www.amazon.com/Around-World-Under-Sea-VHS/dp/6301964292

This Movie give me some inspiration to build the Euronaut. 
And I manage my way into the movie submarine many years ago..
No idear were it is gone now. 
 
Vance has some background also.. 

vbr Carsten


"Alan James" <alanjames@xtra.co.nz> schrieb:
> 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
>   To: 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
>     To: 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 
> 




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