Re: foam hoam
As long as you never have any leaks, the hollow mast is going to be
lighter than the foam filled one, with the same bouyancy. Bouyancy is
not a magic property but based on the weight of the water displaced.
lighter than the foam filled one, with the same bouyancy. Bouyancy is
not a magic property but based on the weight of the water displaced.
--- Inbolger@egroups.com, mzeiger@h... wrote:
> Mike,
>
> I was talking to my brother about filling a hollow spar with foam,
> and he said that if the space is air tight (which with those
sponsons
> would mean paying reasonable attention to construction and a little
> caulk)then filling it with foam is counter productive--it adds to
the
> weight (although slightly, I would assume) rather than adding
> bouyancy
> beyond the air.
>
> He may be wrong, but sealing them up sounds much better than
filling
> them with foam, especially since I'd be tempted to seal them up
> anyway
> to protect the foam! An expensive, time-consuming, vicious circle,
> perhaps.
>
> Mark Z.
Mike,
I was talking to my brother about filling a hollow spar with foam,
and he said that if the space is air tight (which with those sponsons
would mean paying reasonable attention to construction and a little
caulk)then filling it with foam is counter productive--it adds to the
weight (although slightly, I would assume) rather than adding
bouyancy
beyond the air.
He may be wrong, but sealing them up sounds much better than filling
them with foam, especially since I'd be tempted to seal them up
anyway
to protect the foam! An expensive, time-consuming, vicious circle,
perhaps.
Mark Z.
I was talking to my brother about filling a hollow spar with foam,
and he said that if the space is air tight (which with those sponsons
would mean paying reasonable attention to construction and a little
caulk)then filling it with foam is counter productive--it adds to the
weight (although slightly, I would assume) rather than adding
bouyancy
beyond the air.
He may be wrong, but sealing them up sounds much better than filling
them with foam, especially since I'd be tempted to seal them up
anyway
to protect the foam! An expensive, time-consuming, vicious circle,
perhaps.
Mark Z.
THis stuff has isocyanates, so ventilate very well. I understand that
organic vapor cartridges don't filter it out. Wear lousy clothes or a
tyvek suit if you're going to spray it in. Cover yourself up pretty
well. Do not enclose the areas you're going to fill until it sets for
a couple of days ( I read an article about a sailplane that had
swollen ailerons because of this, but actually I'm not exactly sure
on
the time factor). It's easy to cut with a saw, or even a knife, tho
the edge will be a bit rough. I should think pouring in would be less
messy. If so, do it a bit at a time, you want to mix quickly and pour
before it sets. Don't use the one part stuff from a can (i.e. Great
Stuff) unless you are only doing fairly thin layers with lots of time
to set (a friend ran into this problem).
organic vapor cartridges don't filter it out. Wear lousy clothes or a
tyvek suit if you're going to spray it in. Cover yourself up pretty
well. Do not enclose the areas you're going to fill until it sets for
a couple of days ( I read an article about a sailplane that had
swollen ailerons because of this, but actually I'm not exactly sure
on
the time factor). It's easy to cut with a saw, or even a knife, tho
the edge will be a bit rough. I should think pouring in would be less
messy. If so, do it a bit at a time, you want to mix quickly and pour
before it sets. Don't use the one part stuff from a can (i.e. Great
Stuff) unless you are only doing fairly thin layers with lots of time
to set (a friend ran into this problem).
--- Inbolger@egroups.com, "Mike Stockstill" <mkstocks@b...> wrote:
> Hi flotation fans!
>
> I am thinking about filling the Martha Jane Revision sponsons with
> spray in foam for buoyancy. Since I have not used that product
> before, I am open to advice, recommendations, warnings, and success
> stories.
>
> Foam Hoam.
>
> Thanks.
>
> Mi
Hi flotation fans!
I am thinking about filling the Martha Jane Revision sponsons with
spray in foam for buoyancy. Since I have not used that product
before, I am open to advice, recommendations, warnings, and success
stories.
Foam Hoam.
Thanks.
Mi
I am thinking about filling the Martha Jane Revision sponsons with
spray in foam for buoyancy. Since I have not used that product
before, I am open to advice, recommendations, warnings, and success
stories.
Foam Hoam.
Thanks.
Mi