-----Original Message-----
From:
owner-personal_submersibles@psubs.org
[mailto:
owner-personal_submersibles@psubs.org]
On Behalf Of irox
Sent: Sunday, 27 February 2011 5:16 PM
To:
personal_submersibles@psubs.orgSubject:
Re: [PSUBS-MAILIST] pressure compensated outboard
Hi
Brian,
given that almost all submarines that have used gasoline as fuel
have met with a horrible end (Doc's bionic dolphin being the only exception,
but that only submerges for seconds), I would stay away from
gasoline.
You did motivate me to search for diesel outboard, seems like
there have been a few, although not a popular diesel application:
http://www.yanmar.com.au/marine/d_series/dseries.htmI
think a small diesel generator powering the main thrusters would be a more
convenient set up (and safer).
Also, I would consider making the
housing from something that was less flammable that fiberglass.
My
2cent!
Cheers!
Ian.
-----Original
Message-----
From: "ojaivalleybeefarm @
dslextreme.com"
Sent: Feb 26, 2011 9:19 PM
To:
personal_submersibles@psubs.orgSubject:
Re: [PSUBS-MAILIST] pressure compensated outboard
A Johnson !
I thought the AGMs were good to go, do they have air in them? It
would be too much to ask to have the engine cover already set up to work as an
ambient housing. I was thinking electric start so as to eliminate the
pull cord, but I guess you could work around that. They make these
outboards just huge now, I have a friend who has a Yamaha 225 hp. he says they
make a 350 hp with a V8 ! Maybe the thing to do is to get a inexpensive
one off of craigslist and do a test and try and make it
work.
Brian
On Sat, Feb 26, 2011 at 7:23 PM, Alan James
<
alanjames@xtra.co.nz>
wrote:
Not sure about the battery Brian.
I think wet cells
are OK but AGM type batteries need a bit of work to enable them to take
the pressure.
Was looking at a few motors, & some of them that have the
fiberglass motor covers going right down over the motor may be able to be used
without enclosing this top section.
The example below has a pull start wich
would be a problem.
http://www.trademe.co.nz/Trade-Me-Motors/Boats-marine/Parts-accessories/Outboards/auction-355960445.htmYou
would have your ambient system set up with the float down low, maybe in just a
tube covering the lower section, so everything above that point would have the
air pressure above the water pressure. This would mean that if the motor cover
seal (wich you may have to beef up) failed it would be letting air out rather
than water in.
With the pull start you could do something like attach a
small threaded plug to the back of the pull handle & a female fitting on
the motor cover that the plug is screwed in to for diving.
Alan
-----
Original Message -----
From: ojaivalleybeefarm @
dslextreme.comTo:
personal_submersibles@psubs.orgSent:
Sunday, February 27, 2011 11:42 AM
Subject: Re: [PSUBS-MAILIST] pressure
compensated outboard
Do those small outboards have a battery
inside? The things that would have to be worked out are the starter
button, the fuel line, the throttle, steering, air intake ( could be a valve),
material to make it out of. I think just using a hardwood like oak for
the structure of the enclosure and then just fiberglass and epoxy to do the
finish shape. Seal inside and out with
epoxy.
brian
On Sat, Feb 26, 2011 at 8:55 AM, Alan James
<
alanjames@xtra.co.nz>
wrote:
I was looking at some small motors on an auction site
last night.
I guess every different motor would present it's own set of
problems.
Would be fun having a snorkel & running the sub on outboard
just below the
surface.
Alan
----- Original Message
-----
From: ojaivalleybeefarm @
dslextreme.comTo:
personal_submersibles@psubs.orgSent:
Sunday, February 27, 2011 2:59 AM
Subject: Re: [PSUBS-MAILIST] pressure
compensated outboard
Nice it's all figured out now, now the only thing
left is to build it ;)
On Fri, Feb 25, 2011 at 11:10 PM, Alan
James <
alanjames@xtra.co.nz>
wrote:
Hi Brian,
Yes, epoxy & you need to try it on the
polystyrene first, as some additives
in some epoxies can dissolve
polystyrene.
Acetone does a good job on polystyrene. Petrol can dissolve
it. It dissolves down to a
hard thin layer. Sometimes flakes of it come
off, so you'd want to make sure these wouldn't
travel anywhere where
they're not wanted.
I was thinking you would need to glue several blocks
made of some heat resistant material
like aluminum, around the motor, flush
with the level of the polystyrene, so the fiberglass jacket
was left
suspended around the motor on these.
A further thought was that you could
calculate the volume of air required to counteract any
buoyancy problems
caused by the motor at the back of the sub. & incorporate this in the
size
of the motor jacket.
Alan
----- Original Message
-----
From: ojaivalleybeefarm @
dslextreme.comTo:
personal_submersibles@psubs.orgSent:
Saturday, February 26, 2011 7:12 PM
Subject: Re: [PSUBS-MAILIST] pressure
compensated outboard
I did think of Frank when thinking of this,
maybe he's still influencing our thought process more that we know ! so
you're saying create a very small amount of an air pocket. Somehow I was
thinking steel, but that really wouldn't matter with an ambient situation.
A fuel bladder would work also. How does one go about dissolving
polystyrene? Actually polyester resin is not compatible with styrene so
you would have to use an epoxy - which would be so much the better
anyway.
Brian
On Fri, Feb 25, 2011 at 7:18 PM, Alan
James <
alanjames@xtra.co.nz>
wrote:
Hi Brian,
there are flexible fuel tanks that have the
advantage in that they would be pressure resistant
& as your fuel level
changes your buoyancy wouldn't change; or not significantly.
You could
possibly cover the motor with thin sheets of polystyrene then fiberglass over
it &
dissolve out the polystyrene leaving a small pocket of air around
it.
I'm sure if Frank were around he'd be on to this. He wanted to put an
outboard on Git Kraken.
Regards Alan
----- Original Message
-----
From: ojaivalleybeefarm @
dslextreme.comTo:
personal_submersibles@psubs.orgSent:
Saturday, February 26, 2011 3:10 PM
Subject: Re: [PSUBS-MAILIST] pressure
compensated outboard
Hi Alan,
That was my first thought, if any components would be
affected. I can't see where there would be a problem, anything that has
gasoline in it would be safe as far as pressure is concerned. I'm
thinking a 20 hp or so outboard, electric start, fuel injected. I think
most of those are water cooled so that would be a plus. I would just
turn the whole cylinder to steer, and mount the thing in there good. Have a
fuel line that could be valved off, the fuel tank might have to be pressure
resistant.
Brian
On Fri, Feb 25, 2011 at 5:58 PM, Alan
James <
alanjames@xtra.co.nz>
wrote:
An ambient outboard!
Sounds like an idea with a lot
of potential Brian.
I'm wondering if there are any components that
may be affected by the air pressure.
How big a motor are you envisaging?
What sort of motor controls?
Regards Alan
----- Original
Message -----
From: ojaivalleybeefarm @
dslextreme.comTo: personal_submersibles
Sent:
Saturday, February 26, 2011 12:57 PM
Subject: [PSUBS-MAILIST] pressure
compensated outboard
I have an idea for a pressure compensated
outboard engine so as to give surface power for my sub. Basically it
would be a "can" that would cover an outboard engine with an opening on the
bottom. There would be a float valve located near the bottom of the
opening so when I submerge, as the water begins to move up into the cylinder,
compressing the air, the float valve would inject air. That way it would
keep a constant volume of air in the outboard engine compartment. As you
assend the extra air would simply expand out the
bottom.
Brian
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