----- Original Message -----
Sent: Thursday, January 26, 2006 8:41
PM
Subject: RE: [PSUBS-MAILIST] Electric
PSUB
Michael,
You made a good start with R/Csubs and reading. I shall
give some awnsers an commets to your questions.
At the list is steel the material of choise for
reliability and ageing reson
Book has arrived: "Concepts in Submarine Design" by "Roy
Burcher and Louis Rydill"
60m operating depth
100m crush depth MAX (where I will run it
(fresh water) won't be deeper than that)
[Emile D.L.van Essen] for these depths a safety factor of 2+ is
common
I
read that x2 was the safty factor, but as I said the place where it will be
run isn't deeper than 100m and I doubt it is even that.
1 ATM
Fast
[Emile D.L.van Essen] Why?
Purely fun :-)
Electric
Cheap as possible
'Trailerable'
No compressed air/CO2 absorbants
[Emile D.L.van
Essen] Ballast control should be done with compressed air. A life support
system is easyer and cheaper than yoiu
think.
It wasn't really the cost I was thinking about in
this case. I don't have the ability to buy/have refilled large tanks of
compressed air. And as I said later on I would prefer to use dynamic diving -
mainly safety reasons but there are others.
Inside I want a seat, can't be doing with lying
on my front.
Ideally 1 man operation for in/out the water -
(Think that's all)
It needs to be as cheap as possible,
however obviously I don't want to endanger my life. So I was thinking about
CCTV cameras on the outside in pressure housing, with a array of monitors on
the inside. Any thoughts? Things I thought about : Increased temperature
and battery draw. This would however, allow me to bypass the acrylic dome
aspect.
[Emile D.L.van
Essen] I can help you with a dome (580 mm O.D. @ 30 mm thick) The
view is worth it!
I was thinking about the
construction time/effort cost etc, and it seemed that getting a dome that
large would cost quite abit. I also thought that with a hi-res colour camera
on the outside and a large(ish) screen on the inside it would do just as
well. No idea how well, just guessing.
Propulsion. I have a 2HP (36V) electric
motor left over from another project, now would this be enough to propel me
through the water at a reasonable speed? Not sure if you call it dynamic
diving (use of hydroplanes to dive) but that is what I was thinking and so
will need some speed.
[Emile D.L.van Essen] You can make a R/C sub slightly
buoyant and you can dibe dynamic. A psub need freeboard . Ballast tanks should
have 20-30 % boats volume; that dont dive with
2 HP.
As I've only sailed a couple of times 2 years ago I'm unfamilar
with terms. What does 'freeboard'
mean?
The other thing that I always try to aim
for when I made subs in the past, was to make battery power the only limiting
factor. So things like CO2 absorbant/air scrubbers need to be 'bypassed'. I
was thinking about changing the air every 10? minutes so as to eliminate this
problem (open hatch, nothing fancy). Anyone see a problem with this?[Emile D.L.van Essen] As
said, a LSS is not so difficult but a internal space of 500 liter gives a safe
dive time of 1/2 hour. You can use dive gear for
emergency.
Although I'm not suba qualified I do have a Royal
Navy Submarine Escape Immersion/Survival Suit that I guess I could use.
I take it 500litres is on top of items in the
sub?
Groet,
Emile
Thanks
Again,
Michael