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RE: [PSUBS-MAILIST] milestone
I must say I really enjoyed this post. I'm so used to dealing with the
usual materials, that the discussions about types of sand or mesh are
totally foreign to me. I feel like a tourist on Planet Concrete and
it'll be really cool to see how this boat evolves. Also Ian's sub, I
can't wait to see that one in the water.
Thanks Brian!
Alec
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From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brian Cox
Sent: Friday, January 22, 2010 2:05 AM
To: personal_submersibles@psubs.org
Subject: 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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