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[PSUBS-MAILIST] con
Hello Carsten,
You are the guy that visited me on lake Atter right?
Will do my best to get a couple of pictures online.
Had some tube connections in molding process (complicated) but found out that
this is not necessary in practice.
If you just hammer a hole trough the wall (remember 18cm not a delicate work
no risk of cracks) and pop a tube cable whatever trough, close the hole
(around tube, cable) with the kind of rapid binding cement used for fixing
screws in concrete and later cover the whole thing with bitumen or silikon it
will not leak and it will hold.
Just imagine a tube fixed with cement in a 18cm wall - what is the force you
need to push it trough - if you applie 10kp force it will not move (100m
depth) if you applie a ton probably also will not move (1000m depth) so
special connectors are not necessary as long as wall is that thick. Make hole
big enough to have place for rapid binding cement around it.
No this is not molding as in glassfiber hulls. You need a forming process like
usual in concrete construction that holds steel bars in place and allows
liquid concrete to compacting. Watching as it is done for bridges gives a good
idea. Have a removeable form to make a piece (for example a conus shape ring
in a blimp form) every day.
Outside of bridges towers etc. is always smooth as far as form is smooth.
Hatches were plexi glass (had in concrete in first boat).
Max possible Velocity is similar to a heavy motor or sailing boat of same size
(length) depends mostly on length/diameter ratio (on surface) subs submerged
should be a bit faster as no wave resistance (but submerged little power
available).
Had a diesel generator to recharge batteries. Range depends on tank volume -
similar to heavy diesel motor yachts.
Had in beginning installed only 1000 W electric power this hull moved
incredibly quick some 3 knots with that - what is a hell of speed under water.
Dear D,
Not sure to understand your question completly. In any case this was MASSIVE
concrete 18cm walls - steel 6mm bars as in normal construction must be in
middle of wall (at least 2 cm from surface) to avoid rust and take full
tension.(every construction engineer knows it) NO chicken wire involved !
No construction in LAYERS this is ferrocement (chicken wire) for thinn hulls
(1-3cm) of yachts. My sub was MASSIVE concrete. Liqid in form and compacted as
in normal construction.
Of course was it watertight.
You seem to have concerns about concrete in direct contact with seawater. My
boat had a outer skin of 5mm bitumen (tar) reinforced with glass fiber.
So concrete is not in contact with water under pressure - this is similar in
dam construction. In deed in dam construction filtration problem is by far
more severe as you have to connect a dam with rock that is filtering etc. in
practice all this is managable. Covering a submarine with a waterthight skin
is quite easy compared to that.
All in all in practice concrete in seawater contact is by far less problematic
as steel or aluminium in sea water contact.
Can handle it. Problem of CaCo3 process reverse is more in theory than in
practice. Oil tanks in north sea, drilling platform underwater struckture all
in concrete are already in use and never presented problems most of them
without any coating.
Just make following experiment put a concrete, alu, steel probe (holow shpere)
in saltwater under pressure during a month.
Will see that concrete will alterate by far less than other materials.
Kind Regards
Wilfried
-----------------------------
Carsten
Hi Wilfried, welcome here !
please can we have some pictures of the sub at Moki file - or direkt
send to Ray ?
How do you build in the pipe, vale and cable conections - do you build
everything in during the molding process - or later ?
Do you build a negative mold to get a smooth outside hull ?
Hatches also from concret ?
How fast is the sub - underwater and on the surface - range ?
- 9 m long - it is diesel-electric ?
best regards Carsten
-----------
Very.
Curious about seacrete.
Wais best steel innards system? Was thinking geodome of some sort of rebar,
chicken wire periodically to lay down.
Can get 1" every 6 weeks.
Reading lots, think can go faster/ or do better.
Would be thrilled if anybody knew how to plug in sphere/arcs and concrete/etc
into the excel spreadsheet.
I'm liberal arts...
D.
-------------
> Hi Wilfried, welcome here !
>
> ---
Oh yeah.
1) is it waterproof?
2) would it dissolve at certain ocean temperature/ph combinations?
(CaCo3 process reverse anywhere from few 100m's to 1000's, depending.)
3) how does it take a silicon-based coating?
Really would like to seal mine with what amount to UV-baked on glass.
Or alternate with silicon based layer every second, cycle with each brine
batch, so cannot strip off more than few mm's at time no matter how long the
time frame in certain setting.
Curious about allowing 1atm using thin tube to surface, dump down to deep
where osmosis will squeeze out fresh water - scoop that. Take brine and dump
into fast-track seacrete vat.
Can use soluble gas bubble entrainment ? gas lift ? to ferry it up.
Kinda like OTECs.
Whaddayathink?
D.
> Hi Wilfried, welcome here !
>
> ---
Oh yeah.
1) is it waterproof?
2) would it dissolve at certain ocean temperature/ph combinations?
(CaCo3 process reverse anywhere from few 100m's to 1000's, depending.)
3) how does it take a silicon-based coating?
Really would like to seal mine with what amount to UV-baked on glass.
Or alternate with silicon based layer every second, cycle with each brine
batch, so cannot strip off more than few mm's at time no matter how long the
time frame in certain setting.
Curious about allowing 1atm using thin tube to surface, dump down to deep
where osmosis will squeeze out fresh water - scoop that. Take brine and dump
into fast-track seacrete vat.
Can use soluble gas bubble entrainment ? gas lift ? to ferry it up.
Kinda like OTECs.
Whaddayathink?
D.
------------------