On Sat, Dec 12, 2009 at 2:11 AM, Brian Cox
<ojaivalleybeefarm@dslextreme.com> wrote:
You need to take a look at the bionic dolfin!
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]On Behalf Of Stewart
Gardiner
Sent: Friday, December 11, 2009 10:24 PM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] 1 Man scuba scooter idea that could be used
in small sub propulsion systems....
Hi Brian! Sorry about the late reply, been busy before xmas as usual...
For the metal detector/magnetometer I was thinking along the lines of an
oil filled PVC pipe with the coil inside it... with fins to make it into
a tow fish... that way it wont be compressible and the coil will be
varnish coated anyway... I can always epoxy coat it if the
varnish/enamel wont work well with the oil filling...
As far as the 1 person sub/scooter I was actually thinking along the
lines of a jetski.... which can run for extended periods on the surface
and then dive for short periods... if It had a couple of compressed air
tanks I was hoping to run some sort of a pressure regulator (might have
to be variable and staged) to feed the compressed air to a 2 stroke
motor for the short few minutes its under water...
Then I could tie it up... have some kind of pressure compensation in the
engine compartment to keep the water out at a few metres depth... and do
the short dives I wanted to do.... and then go back to shore...
Electric propulsion does make sense but the extra space needed to have
both systems makes the "man portable" idea become less ideal...
I don't want to use it for extended periods underwater... I was even
thinking about building hydrofoils into the scooter/hull so it could
plane above the waters surface! :) but that would come later.. after I
figure out all the other tricky bits...
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brian Cox
Sent: Friday, 11 December 2009 2:22 AM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] 1 Man scuba scooter idea that could be used
in small sub propulsion systems....
Hi Stewart, Welcome to the group ! Have you figured out how to
protect
your metal detector from the pressure of the water at depth?
As far as running an engine underwater I think you would consume the air
in
a scuba tank in a matter of minutes depending on how deep you are.
Electric
power would be a better choice. You could run a generator on the
surface
and run a ambilical cord if you didn't want to use batteries.
Brian
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]On Behalf Of Stewart
Gardiner
Sent: Thursday, December 10, 2009 6:19 AM
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] 1 Man scuba scooter idea that could be used in
small sub propulsion systems....
Hi All... I guess I should introduce myself! :) My name is Stewart and I
am a long time "lurker" I've been interested in all things "interesting"
related to marine vehicles for a long time.... Hydrofoils, Submarines,
Submersibles etc I own my own Ski boat which I'm rebuilding at present.
My family has had a machine shop since the 1930's and my grandad was an
engineer on Sunderland and Catalina flying boats during ww2... I'm a
self employed IT consultant who also has skills and experience with
electronics since the age of about 7! :)
At the moment im building a "Gold/metal detector kit" called the
goldpic... It's a PIC controlled Pulsed induction metal detector... IE
it detects non ferrous metals as well! :) http://home.global.co.za/~trh/
<--- website for goldpic, Im hoping to adapt this for marine use from a
boat towing it behind like a tow fish etc...
Enough with the introduction on with the questions! :)
This is my first time with a question... So please bear with me...
An Idea I have had running around in my head was making a small 1 person
"scuba scooter" to propel a diver under water... And while there are
plenty of these on the market my idea expands on them a little...
http://www.seadooseascooter.com.au/ - Electric Scuba scooters already
produced..
My idea is a 2 stroke petrol powered neutrally buoyant scooter that a
person lays on....
My main question is, using a tank of compressed air, would it be
possible to power a 2 stroke motor while it is at a depth of up to 5 or
so metres underwater? I wouldn't like to go deeper than that if I was
skin diving with it... Scuba diving say 12 metres... but as depth
increases I know keeping the water out becomes more of an issue...
How would you seal the exhaust so that it allows exhaust gasses out
under pressure but not allow water in? some kind of ball/gravity valve?
The rest of the issues are simple compared to that I feel...
Also as a simple "emergency ascend" feature (also if the motor
compartment floods) I was going to use a self inflating life jacket/CO2
cartridge style arrangement...
This is not designed to go "DEEP" and is only to be used for quick
commuting to a dive site from the shore with dive tanks on... then ill
anchor it and dive... and then use it to get back to shore.... It will
be man portable and have 1 maybe 2 standard scuba tanks under it...
think james bond :)
Regards
Stewart Gardiner
Terminal Solutions
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