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RE: [PSUBS-MAILIST] milestone
Well if you must know... I guess I can take time out of my busy day. You
know I don't like going on and on about my sub. ( just tell me to shut up if
you've had enough)
8 total layers of 22 gauge galvanized hex netting. The hex netting is the 1
inch aviary netting. That is 4 layers on each side of the rebar or the
internal armature. I basically followed the same proceedure as how one
would build a ferro-cement sailboat. Since the shape that I built was
relitively small (21 ft long), and only 8 ft wide at the widest point I
probably could have gotten away with not using ribs inside but I figured
since there was going to be some unique stresses on this thing I went ahead
and built just like you would a sailboat. I even spaced the ribs closer for
additional strenght (18" OC).
I have some pics of my early construction on my web site.
Anyway, using the ribs is better anyway because it gives you a framework to
tie on the stringers. The stringers are 1/4 inch hard drawn wire - it has a
spring to it so you can bend it to make a nice curve. Those go on at about
3" apart. They get tied on with wire ties. Then you have diagonals, which
are 1/8" hard drawn wire which go on - you guessed it - diagonal to the
stringers, this is so that any irregularities in the shape tend to get
smoothed out, so you have clean lines. Once all that is all wired on then
you're ready to put on the netting. - with millions of more wire ties - can
you say carple tunnel syndrome !
Once everything is hunky dory and all the mesh is nice and tight you are
ready to plaster ! I used a mix of 1 part sulphate resistant cement (most
all cement is) to 2 parts sand. You can't just use any old sand. You need
to look for jagged shaped sand, you don't want to use round river sand. The
reason is that you want it to key together really good. I talked to a
concrete expert and he clued me into this sand over in Soladad Canyon where
it is blasted out of a rock quarry and ground up into sand. The other thing
is you also want an gradation of sizes of sand particals, not just all one
size. The specs that I got on the make up of the sand from Solidad canyon
was practially a text book perfect sand that I needed. You want to try and
hold the thickness to around 1 inch.
I hired some plasterers on the first round and let them do their thing, I
was very nervious because I was very concerned about the water content and
getting the mix right. But I just let them go because there is the practcal
side of it also, ideally you want a low water content but it's very hard to
get the penitration into the mesh if the plaster is too hard to work with.
So you may have to sacrifice a few thousand psi strenght factor but you are
getting better penetration and ultimately a better finished product. The
top part of the clamshell I did myself with some extra help and everything
went well. -
Brian
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]On Behalf Of F. Marc de
Piolenc
Sent: Thursday, January 21, 2010 8:13 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] milestone
Would you mind describing the composition of your ferro laminate -
number of layers and type of mesh, mortar mix, total thickness?
Inquiring ferromaniacs want to know...
Best,
Marc de Piolenc
Brian Cox wrote:
> Wow, great pictures, labor intensive indeed ! I'm so glad I'm done with
> this phase, I would get so many wire cuts on my hands and arms it was
> ridiculous, I'd be a bloody mess at the end of the day, no matter how
> careful I was. All that nasty wire is finally sealed up.
>
> This top part is what I just finished plastering ( below pic), I was able
to
> plaster it as it is shown in the picture. Having done that, I essentially
> maintained the correct mateing with the bottom half of the clamshell
piece.
> After that top part cured I flipped it over and did the other side.
>
> http://www.psubs.org/projects/1234567812/ferrosuperstructure/
>
> Brian
>
>
>
> -----Original Message-----
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org]On Behalf Of Jim Rudholm
> Sent: Thursday, January 21, 2010 1:19 PM
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] milestone
>
>
> Brian,
> I built a ferro-cement 26' party barge several years ago. It was
> outside and upside down for plastering and we covered it with one
> sheet of black plastic. We made sure that the ground was soaked
> underneath, the temperature went up to 120 or so and cured in a few
> days.
>
> http://picasaweb.google.com/jimrudholm/FerrocementPartyBarge#
>
> Jim
>
>
>
> On Thu, Jan 21, 2010 at 10:31 AM, Brian Cox
> <ojaivalleybeefarm@dslextreme.com> wrote:
>> Marc,
>> There is not much to see right now, It's all covered in wet
>> burlap for the next couple of weeks. Maybe I'll throw an outboard on the
>> back of it and drive out to Florida ! Maybe not - July I will be very
> busy.
>>
>> Brian
>>
>> -----Original Message-----
>> From: owner-personal_submersibles@psubs.org
>> [mailto:owner-personal_submersibles@psubs.org]On Behalf Of F. Marc de
>> Piolenc
>> Sent: Wednesday, January 20, 2010 4:56 PM
>> To: personal_submersibles@psubs.org
>> Subject: Re: [PSUBS-MAILIST] milestone
>>
>>
>> This is the steel hull, ferrocement casing craft?
>>
>> Pictures, please!
>>
>> Best,
>> Marc
>>
>> Brian Cox wrote:
>>> Gentlemen, I now have a submarine ! Well, sort of, I finally
completely
>>> finished plastering all parts of my boat. At the very least I can now
> use
>>> this as an ambient sub using scuba gear and even with no propulsion it
>> could
>>> function as a glider sub. Word to the wise, always protect your hands
> when
>>> using cement, I would have had my completion date move up a couple of
>> weeks
>>> if I hadn't injured my hands from the caustic action of the cement !
>>> Really stupid of me, guess I got caught up in the moment! One area was
>> very
>>> hard to get to I was using my hands to get the cement up in there, I
paid
>>> dearly for that ! I would recomend coating your hands with vasiline or
>>> equivilent, latex gloves, and then cotton gloves over that. Anyway I got
>> it
>>> done !
>>>
>>> Brian
>>>
>>>
>>>
>>>
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CAN-SPAM Act of 2003. Your email address appears in our database
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