[PSUBS-MAILIST] Thrusters, Air & Diesel Musings

Some figures: 

Euronaut with Diesel    : abt. 300 sm range
with the lead batteries : abt.  30 sm range

with Lithium batteries  : est. 120 sm range     
with diesel and auxilleries build out and
lithium batteries instead             :     est .  150 sm range

The Nordic Sub type will have aroub 50 sm with lithiun batteries
18 sm the spot, 18 sm back, 14 as reserve. 

On small K subs I would go with batteries only. 

vbr Carsten 

"Private" <alecsmyth at gmail.com> schrieb: 
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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-- 

Carsten Standfuß
Dipl.Ing.Schiffbau @ Meerestechnik
Heinrich Reck Str.12A
18211 Admannshagen

0172 8464 420
WWW.Euronaut.org
Carsten at euronaut.org
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