[PSUBS-MAILIST] Thrusters, Air & Diesel Musings

[Alan]

Hi Hank,
With regard to the off the shelf, water pump, magnetic coupler.
I wonder if the thrust bearings would be a problem in our application.
On a water pump you would have maybe a belt driven pulley on the shaft 
of the coupler & no need for thrust bearings. Whereas in our application with the propeller
exerting force down the shaft they are needed, & if used would be exposed to fresh or sea water unless you used some sort of seal. And sealing it would defeat the purpose for it's application in the first place, wouldn't it?
Alan



Sent from my iPad
Defeats
On 12/10/2013, at 4:37 PM, hank pronk <hanker_20032000 at yahoo.ca> wrote:

> Joe,
> I am a lover of hydraulic anything.  I am sure you can go hyd all around with no trouble.  Problem is efficiency, they will rob 25%.  If you want range, then its no good.  If you launch from a ship and look around then it would not matter maybe.  With seals the way they are now and magnetic couplers, electric still wins.
> I was looking on e bay and there is a magnetic coupler for a water pump that could be modified for our purposes.  I like the idea but I have no real need to improve a sub that is perfect :-)   Also my budget is hurtin bad.
> Hank
> 
> From: Joe Perkel <josephperkel at yahoo.com>
> To: Psubbers Mailist <personal_submersibles at psubs.org> 
> Sent: Saturday, October 12, 2013 6:17:20 PM
> Subject: [PSUBS-MAILIST] Thrusters, Air & Diesel Musings
> 
> Some quick questions / observations / musing come to mind as I sit here editing videos.
>  
> It looks to me like Alvin's thrusters all have a 90 deg drive arrangement like yacht bow thrusters. Some of these off the shelf units are hydraulic, but way over powered for a Delta / Gamma sized sub. There are however, lots of little hydraulic motors out there, a slew of them. Ive also seen drive components, reductions, etc, that simply were not available to George. How much trouble would it be to go hydraulic all around?
>  
> If DC motors must be used, in my view then the single must have improvement to the T-Rex design is the addition of a mag coupling.
>  
> Alecs experience has me rethinking self sufficiency. It would be nice to charge the batteries and the HP tanks independent of a surface boat, eliminating the need to raft alongside in swells. All this convenience means a "Tours 66" type of arrangement. But Tours 66 weighed in at 10 tons.
>  
> Everything is now downsized like that little AC unit I posted,.. take a look at this marine gen-set (note dimensions)  http://www.nextgenerationpower.com/Info/Support/3-5Specs.pdf 
> Hmm, could this not be enclosed in the hull during a build, or otherwise slung longways down the hatch into a 42" hull? No prop shaft and seals, (you still get towed) but independent re-charge capability for both batteries and HP air with an equally downsized compressor!?!
>  
> So the question of the day is,...
>  
> Is a comfy air conditioned & self sufficient research capable PSUB for sport diving in Florida / Caribbean waters, a realistic goal at around 3.5 tons and $8-$10 lb?
>  
>  
> 
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