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RE: [PSUBS-MAILIST] CNG power for subs

Hi Brian,
I would go for LPG rather than CNG and the kits are similar.  You could get
it tuned for Propane or butane mix which ever you have and it is easily
filled anywhere. Range is much better and those light cylinders that Frank
was looking for using as VBT's are LPG cylinders you can see through. I
would think that they would be good for around 1000 ft but definitely 500 ft
as long as they had some LPG still in them. Gasoline engines are lighter
than diesel engines.  I would love to find a really small high horsepower
(150 ) high speed, Diesel engine.  Chs,  Hugh  



-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brian Cox
Sent: Wednesday, 28 July 2010 3:58 a.m.
To: Personal_Submersibles@Psubs. Org
Subject: [PSUBS-MAILIST] CNG power for subs

Hi All,   Hope everybody had a good time at the convention !   Congrats
Vance on your new aquisition !

CNG for subs:

The main objection to having a gasoline engine on a sub is the volatle gas
fumes.  I was thinking that it might be advantages to use Compressed Natural
Gas in a regular automotive engine (like a Chevy 350) or whatever would work
size wise in a psub.  There is a slight power reduction with CNG but not
much. Also the pressurized tank required would take up a bit more room than
diesel, but since it is pressurized it would function well at depth as far
as keeping seawater out.  Another added benifit would be the elimination of
any possible spills into the ocean environment.  If one went with a CNG
power it would give you a lot more options with types of engines,
compression ratios would have to be altered however.  You can find engines
from the factory designed for CNG otherwise you would need to retro-fit.

Brian




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