[PSUBS-MAILIST] Thrusters, Air & Diesel Musings

[hank pronk]

Good point Alec,
better to add volume for batteries and make it stream lined.
Hank

From: Private <alecsmyth at gmail.com>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Saturday, October 12, 2013 7:28:44 PM
Subject: Re: [PSUBS-MAILIST] Thrusters, Air & Diesel Musings



Interesting, because for my part I'm heading in the exact opposite direction. My next sub aims to be the ultimate in simplicity, and will make Snoopy look really complex by comparison. As for the heat, I don't want the complexity of A/C and would be content if I could simply open the hatch, hence freeboard is a priority. I could augment that by simply adding a blower for ventilation on the surface. The thrusters will be fixed, no linkages and actuators like Snoopy. No VBT. Thrusters and speed controllers will be four identical units, and will be replaceable in a few minutes (thrusters are emergency-droppable, so to replace you just drop them). The goal is to have a sub so simple that I can ship it to a remote location and know it will have no technical glitches whatsoever and that I will have spares on hand at all times for it's few moving parts. 

It will have 12 batteries in the main banks, and when you add to that the rate at which battery density is improving, I think there'll be enough juice to render a diesel unnecessary.

I once went as far as buying a tiny diesel to evaluate it for use in a sub, but after tests I resold it on eBay. Too much noise, heat, and complexity for me.

Just my two pennies... The more I dive the simpler my ideal sub gets.


Best,

Alec



On Oct 12, 2013, at 8:56 PM, Pete Niedermayr <freepetesub at yahoo.com> wrote:


Where do you keep the fuel ?
> 
>Pete
>
>
>From: Joe Perkel <josephperkel at yahoo.com>
>To: Psubbers Mailist <personal_submersibles at psubs.org> 
>Sent: Saturday, October 12, 2013 7:17 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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