[bolger] Re: buoyancy and keel ansiety
Thanks, Marco. That makes a lot more sense than what I got from
Babelfish,
david
Marco Vinicio Masoni wrote:
Babelfish,
david
Marco Vinicio Masoni wrote:
>
> Thank you David, for the keel,
> Now I try a difficult (for me) translation of Parmenide:
>
> Therefore, they are only names all things that mortals have
>
> established, convinced that they are true
>
>
>
Thank you David, for the keel,
Now I try a difficult (for me) translation of Parmenide:
Therefore, they are only names all things that mortals have
established, convinced that they are true
In 17.43 10/09/99 +0000, hai scritto:
Marco:
I built a 1200 lbs (~500 kg) keel for a 22' boat by making a male mold out of wood and using it to cast a female mold in a weak sand/concrete mix, and pouring the lead into that. It was no big deal. I used a salvaged cast iron sink with a pipe sealed to the drain with the boat's 1 1/2" throughhull and some refractory cement, perched on cinder blocks (I would recommend fire brick) and a hardwood fire to melt the lead. Heat the pipe with a torch before the pour or the lead will solidify before it gets to the mold. It might be a good idea to wear leather while doing the pour. No need for waterglass. I have no opinion on the inspection ports. Btw, can you provide a translation of your quote from Parmenide? I ran it through Babelfish and got something that I suspect does not capture the gist (or even the literal meaning) of the citation....
david
Laboratorio di Psicologia Dott. Masoni
Piazza Bolivar, 6
20146 MILANO - Italy
Tel. 02-428838
Fax. 02-47716682
email: masoni@...
www.giardino.com/artist/masoni/mason1.html
"Perciò saranno tutte soltanto nomi Le cose che i mortali hanno
stabilito, persuasi che fossero vere"(Parmenide 8, 38-39)
Marco:
I built a 1200 lbs (~500 kg) keel for a 22' boat by making a male mold out of wood and using it to cast a female mold in a weak sand/concrete mix, and pouring the lead into that. It was no big deal. I used a salvaged cast iron sink with a pipe sealed to the drain with the boat's 1 1/2" throughhull and some refractory cement, perched on cinder blocks (I would recommend fire brick) and a hardwood fire to melt the lead. Heat the pipe with a torch before the pour or the lead will solidify before it gets to the mold. It might be a good idea to wear leather while doing the pour. No need for waterglass. I have no opinion on the inspection ports. Btw, can you provide a translation of your quote from Parmenide? I ran it through Babelfish and got something that I suspect does not capture the gist (or even the literal meaning) of the citation....
david
I built a 1200 lbs (~500 kg) keel for a 22' boat by making a male mold out of wood and using it to cast a female mold in a weak sand/concrete mix, and pouring the lead into that. It was no big deal. I used a salvaged cast iron sink with a pipe sealed to the drain with the boat's 1 1/2" throughhull and some refractory cement, perched on cinder blocks (I would recommend fire brick) and a hardwood fire to melt the lead. Heat the pipe with a torch before the pour or the lead will solidify before it gets to the mold. It might be a good idea to wear leather while doing the pour. No need for waterglass. I have no opinion on the inspection ports. Btw, can you provide a translation of your quote from Parmenide? I ran it through Babelfish and got something that I suspect does not capture the gist (or even the literal meaning) of the citation....
david
Marco Vinicio Masoni wrote:
Dear all ,two questions:1) after do I have put the foam for the buoyancy, must I glue the cover and forget the foam or it is better screw the cover for possible inspections? The boat in question is a Micro.2) Does anybody have tried to do the keel in lead with ingots and filled the intersices with small little balls ( that ones of hunters, I don't know the name) and epoxy? I am suffering a crisis of keel anxiety and I don't find the silicato of sodium (water glass) in Italy. Hemmm...3) question: Do you know an alternative to sodium silicate?Thanks all in advanceMarco
Laboratorio di Psicologia Dott. Masoni
Piazza Bolivar, 6
20146 MILANO - Italy
Tel. 02-428838
Fax. 02-47716682
email: masoni@...
www.giardino.com/artist/masoni/mason1.html
"Perciò saranno tutte soltanto nomi Le cose che i mortali
hanno
stabilito, persuasi che fossero vere"(Parmenide 8, 38-39)
pippobianc-@...wrote:
Hi Marco - two Italians communicating in English!
You can always inspect the foam bocks by crawling into the rear "cabin"
in the Micro. I would (and will) definitely seal the deck up there as
everywhere else.
be laminated into the keel mold with epoxy. Your solution should work
well provided you do not leave too much unfilled volume. Packing theory
says that the very best packing with spheres is 75% of a given volume.
By the way, on the other side of the pool they call "bird shot" the
small lead balls used by hunters.
Best
Pippo
Hi Marco - two Italians communicating in English!
> 1) after do I have put the foam for the buoyancy, must I glue thecover and
> forget the foam or it is better screw the cover for possibleinspections?
You can always inspect the foam bocks by crawling into the rear "cabin"
in the Micro. I would (and will) definitely seal the deck up there as
everywhere else.
> 2) Does anybody have tried to do the keel in lead with ingots andfilled the
> intersices with small little balls ( that ones of hunters, I don'tknow the
> name) and epoxy?As you know, I'm looking around for lead in plates, say 1 cm thick, to
be laminated into the keel mold with epoxy. Your solution should work
well provided you do not leave too much unfilled volume. Packing theory
says that the very best packing with spheres is 75% of a given volume.
By the way, on the other side of the pool they call "bird shot" the
small lead balls used by hunters.
> 3) question: Do you know an alternative to sodium silicate?I never saw sodium silicate in my life...
Best
Pippo
Marco:
First of all, do you and Pippo know each other? Italy is a big
country, but from here in Texas, you two are neighbors.
What I would do on foam covers, is to first epoxy the cover and the area
that it contacts separately, then use silicone sealer when screwing the cover
down. The silicone will seal the compartment, but will release if and when
you need to get in.
A mixture of lead ingots and shot set in resin should work fine. I am
looking at the line drawings of Micro, and I don't see why one couldn't use cut
steel plate for the ballast. If you were a stickler for weight, you could
even extend it into the keel deadwood just ahead of and behind the ballast
piece. There seems to be plenty of room to get the required weight of steel
in there. Another possibility would to build the mold out of steel, or
make a pattern (a wood representation of the casting) and take it to a lead
foundry and let them cast it.
Good luck, Marco
Chuck
Dear all ,two questions:1) after do I have put the foam for the buoyancy, must I glue the cover and forget the foam or it is better screw the cover for possible inspections? The boat in question is a Micro.2) Does anybody have tried to do the keel in lead with ingots and filled the intersices with small little balls ( that ones of hunters, I don't know the name) and epoxy?I am suffering a crisis of keel anxiety and I don't find the silicato of sodium (water glass) in Italy.Hemmm...3) question: Do you know an alternative to sodium silicate?Thanks all in advanceMarco
Foams take up water, so it might be good to get to it again in a few years.
But, it it's sealed, it's dry. Probably doesn't make a big difference.
I cast lead shot (for shotgun shooting) in polyster resin, in place, for my
Micro keel. Seems like it was cheap - maybe less than $.50 / pound (lira /
kg...?). I studying the "packing factor" and increased the keel area maybe
20% while mainting the c.g. Well, it didn't all fit, so the keel was light
by maybe 100 pounds! I added a 1/4" by 2" steel strap along to bottom for
strength and extra weight (25 pounds). The whole affair was light but
worked fine in a knockdown.
I would think combining some ingots and shot would increase your density
just fine.
I did this all upside down, turning it over was interesting!
Gregg
At 09:06 AM 9/5/99 +0200, you wrote:
But, it it's sealed, it's dry. Probably doesn't make a big difference.
I cast lead shot (for shotgun shooting) in polyster resin, in place, for my
Micro keel. Seems like it was cheap - maybe less than $.50 / pound (lira /
kg...?). I studying the "packing factor" and increased the keel area maybe
20% while mainting the c.g. Well, it didn't all fit, so the keel was light
by maybe 100 pounds! I added a 1/4" by 2" steel strap along to bottom for
strength and extra weight (25 pounds). The whole affair was light but
worked fine in a knockdown.
I would think combining some ingots and shot would increase your density
just fine.
I did this all upside down, turning it over was interesting!
Gregg
At 09:06 AM 9/5/99 +0200, you wrote:
>Dear all , two questions: better screw the cover for possible
>inspections? The boat in question is a Micro. name) and epoxy?
> I am suffering a crisis of keel anxiety and I don't find the silicato of
>sodium (water glass) in Italy.
> Hemmm... 3) question: Do you know an alternative to sodium silicate?
>Thanks all in advance Marco
>
>
> Laboratorio di Psicologia Dott. Masoni
> Piazza Bolivar, 6
> 20146 MILANO - Italy
> Tel. 02-428838
> Fax. 02-47716682
> email:masoni@...
> www.giardino.com/artist/masoni/mason1.html
>
> "Perciò saranno tutte soltanto nomi Le cose che i mortali hanno
>" (Parmenide 8, 38-39)
> eGroups.com home:http://www.egroups.com/group/bolger
> www.egroups.com - Simplifying group communications
>
Dear all ,
two questions:
1) after do I have put the foam for the buoyancy, must I glue the
cover and forget the foam or it is better screw the cover for
possible inspections? The boat in question is a Micro.
2) Does anybody have tried to do the keel in lead with ingots and
filled the intersices with small little balls ( that ones of
hunters, I don't know the name) and epoxy?
I am suffering a crisis of keel anxiety and I don't find the
silicato of sodium (water glass) in Italy.
Hemmm...
3) question: Do you know an alternative to sodium silicate?
Thanks all in advance
Marco
Laboratorio di Psicologia Dott. Masoni
Piazza Bolivar, 6
20146 MILANO - Italy
Tel. 02-428838
Fax. 02-47716682
email: masoni@...
www.giardino.com/artist/masoni/mason1.html
"Perciò saranno tutte soltanto nomi Le cose che i mortali hanno
stabilito, persuasi che fossero vere"(Parmenide 8, 38-39)