Re: [PSUBS-MAILIST] New boy trying to sink

["Thijs Struijs" <thijs-struijs@planet.nl>]

Brent,

Your design looks good but I have some doubts about the idea of an ambient
dry submersible. I am not an expert on dry subs (or any subject) but I think
there are some special problems. The volume of your sub will be around 3
cub. mtr. This means (and correct me if I am wrong) you need 6000 ltr of air
for pressure compensation at 20 mtr..  If you want to go up and down a view
times you need an awful lot of air. And what happens when you, during a
descent,  suddenly get out of  air. The sub will go down like a rock.

I also think that a petrol motor in a closed environment like a sub might be
a little dangerous (explosions).

If you want to keep the costs low, and you don't want to go deeper than 20
mtr. why not skip the petrol motor, make the sub smaller, and build a 1 atm.
sub?
Greetings,

Thijs Struijs


----- Original Message -----
From: "Brent Shaw" <drydivenz@yahoo.com>
To: <personal_submersibles@psubs.org>
Sent: Wednesday, March 06, 2002 11:07 PM
Subject: [PSUBS-MAILIST] New boy trying to sink


I've been searching the archives and watching
discussions of the group for the last year and have
decided to go ahead with my dream. - Drawings
attached.

For cost reasons I've decided to go with an ambient
pressure, dry submersible design to be powered by a
20hp petrol motor for surface cruising and two 71lbs
thrust minn kota motors for sub-surface cruising.

Hull material is to be 8mm corten plate and 12mm
acrylic sheet for view ports.
Overall hull dimesions are 3600mm(l) x 1220mm(h) x
1330mm(w)

Primary air is to be supply by four 120ft scuba tanks
and one 120ft tank for reserve

Operating depths is to be around the 10-20 metre
range.

Any comments for be appreciated

Brent Shaw
Wellington
New Zealand

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