What to use to make a mold?

On Mar 24, 8:11*pm, Darryl Ramm wrote:
On Mar 24, 4:05*pm, AK wrote:



On Mar 24, 12:26*pm, The Real Doctor
wrote:

On 23 Mar, 00:23, AK wrote:

I want to make a small mold I would later use to create a fiberglass
container to hold lead weight. It would be nice if *mold material can
withstand 500 degrees Fahrenheit so I can pour lead into it and then
cover it by fiberglass.

I'm a little puzzled here. When you have filled the mould with lead
and covered it with fibreglass, won't the mould still be in there. Is
that OK?

How big is this thing? How complicated is the shape?

Ian

Ian, I create a mold first then I pour lead into the mold. Later I
break the mold up and I use fiberglass to cover the lead so it is
trapped and I am not exposed to lead dust.

Unless you are planning on eating you lunch off the lead I would not
be too worried by the minuscule exposure. Is this a club ship where
people are going to be moving the weights in and out all day long,
without washing their hands etc? If you are worried by lead exposure,
be careful in venting the area when you cast the lead. And the
exposure to chemicals and fiberglass fibers while encapsulating the
lead in fiberglass may be a larger minuscule health risk than the
small miniscule lead exposure :-) (says man who is hypersensitive to
epoxy).

Darryl

I agree with you that epoxy is not friendly to our bodies. I have
paint booth I build in my garage for hobbies. I just completed my tail
dolly renovation with major epoxy work. Working in a paint booth with
the exhaust fan working no one could smell anything in the garage. I
also have a fresh air supply by Hobby Air so I am all set. Working in
such conditions is actually fun.

Maybe the exposure is not great, but I still like to have the lead
enclosed.

On 24 Mar, 23:05, AK wrote:

Ian, I create a mold first then I pour lead into the mold. Later I
break the mold up and I use fiberglass to cover the lead so it is
trapped and I am not exposed to lead dust.

I don't think you need worry about lead dust. I used to fly a Club
Libelle (not a Libelle owned by a club) which had a 1/4" sheet of lead
under the pilot's seat - if that's the sort of thing you need then why
not glue a thin layer of energy absorbing foam to each side and make
yourself a very heavy cushion?

Ian

At 15:03 25 March 2009, The Real Doctor wrote:
why
not glue a thin layer of energy absorbing foam to each side and make
yourself a very heavy cushion?

And have it hit you hard in the back of the legs under high g if you plant
the glider?

Always a good idea to have any necessary forward of CG ballast in front of
the pilot.

On Mar 25, 11:15*pm, Z Goudie wrote:

Always a good idea to have any necessary forward of CG ballast in front of
the pilot.

That may depend on whether the objective is to adjust CG, or to
increase flying weight.

Andy

On 26 Mar, 06:15, Z Goudie wrote:
At 15:03 25 March 2009, The Real Doctor wrote:
why

not glue a thin layer of energy absorbing foam to each side and make
yourself a very heavy cushion?

And have it hit you hard in the back of the legs under high g if you plant
the glider?

He has said elsewhere, I think, that this is for placing under him.
And he could fasten the cushion down.

Always a good idea to have any necessary forward of CG ballast in front of
the pilot.

In general yes, but surely it depends entirely on the glider's weight,
balance and limits?

Ian