Subject: Re: [harryproa] Bending foam?
From: Rob Denney
Date: 3/25/2009, 6:13 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

G'day,

My Elementarry is 3mm foam with carbon each side. 10mm/3/8" will be
heaps for yours. Flat floors on ww hulls hit with a bang after a
capsize. Definitely 18 oz either side. Airex wil do, but it is very
expensive. I'd persevere with the Core cell.

No need for any money at this stage. Ask questions, I'll answer. I
am away for 2 weeks from next week, so ask before Sunday, please.

regards,

Rob

On Wed, Mar 25, 2009 at 12:14 PM, Gardner Pomper <gardner@networknow.org> wrote:
> The pipe idea is a good one. I may try that on a small piece.
>
> This is all for my sidecar for fat people version. I was thinking of using 6
> oz everywhere, except under the waterline, where I was going to use a layer
> of 18oz. Since that is where the bend is, I guess I need to do more testing
> with the 18oz.
> Another possiblity I have considered, and is getting more attractive, is to
> get some Airex foam for just the highly curved sections. I was thinking of
> the ww hull with a 12" flat floor, and a 6" radius curve up the sides. If I
> use corecell for the flat section, glued to 12" strips of airex, then glue
> more corecell up the sides, then I should be able to bend it. I had a lead
> on some 3/8" airex a month or so ago that I didn't follow up on, so I don't
> know if it is still available.
> I think it is about time that we talk about how I hire you for some design
> work on this. I don't want to buy 3/8" airex, if I need 1/2". I just need
> something preliminary. Or, I can just wait until I have the topsides built,
> but airex is harder to come by than diamonds nowadays.
> - Gardner
>
> On Tue, Mar 24, 2009 at 10:20 PM, Rob Denney <harryproa@gmail.com> wrote:
>>
>> Sound good to me. I would do some more little panels first. If they
>> will bend, then the big one should not be a problem. Could also use a
>> 6" radius pipe to bend it over. Is 6 oz the laminate you will be
>> using on the boat? If not, use whatever you will be using.
>>
>> regards,
>> rob
>>
>> On Wed, Mar 25, 2009 at 10:17 AM, Gardner Pomper <gardner@networknow.org>
>> wrote:
>> > I tried bending it by hand and it bent unevenly, almost like a crease.
>> > If I
>> > was bending it over a mold, then maybe I could use tiedown straps or
>> > something and just tighten it once an hour or something. This was a
>> > small
>> > (3"x12") sample piece I was just bending in my hands. I didn't really
>> > want
>> > to waste a whole panel trying something bigger. If I do a 4'x8' panel,
>> > should I just hang it with straps from the ceiling and pour in sand or
>> > something to weight it down? Add more sand once and hour or something?
>> >
>> > - Gardner
>> >
>> > On Tue, Mar 24, 2009 at 8:46 PM, Rob Denney <harryproa@gmail.com> wrote:
>> >>
>> >> G'day,
>> >>
>> >> Surprised you needed to cut it for a 6" radius. Slow, steady and even
>> >> pressure which evenly crushes the foam on the compression face should
>> >> have done the trick.
>> >>
>> >> The depth of the cuts is trial and error, dependant mainly on the
>> >> radius of the curve and the foam thickness. Deep enough so it bends,
>> >> shallow enough so it doesn't show on the outside.
>> >>
>> >> More, shallower and thinner are best, but time consuming. You should
>> >> also make sure all cuts are filled with bog before folding otherwise,
>> >> if water gets in (usually through a skin fitting) it travels along the
>> >> cuts and eventually gets a bit smelly and messy.
>> >>
>> >> regards,
>> >>
>> >> rob
>> >>
>> >> On Mon, Mar 23, 2009 at 12:58 PM, Gardner Pomper
>> >> <gardner@networknow.org>
>> >> wrote:
>> >> > Hi,
>> >> >
>> >> > I am experimenting with vacuum bagging and resin infusion for the
>> >> > first
>> >> > time. I am trying to figure out how to bend the foam. I have tried 2
>> >> > pieces
>> >> > of corecell, one 1/2" and one 3/8", both with 6 oz fiberglass on one
>> >> > side. I
>> >> > tried using the circular saw, and cut 8 grooves 1" apart, 3/16" deep.
>> >> > This
>> >> > allowed me to bend the pieces into 6" semi-circle, but the foam
>> >> > creases
>> >> > and
>> >> > you can see the fold lines on the outside of the fiberglass; it isn't
>> >> > a
>> >> > smooth curve.
>> >> > Is there some information on how to do this with corecell? I have a
>> >> > older
>> >> > booklet that talks about airex, but it is bendable.
>> >> > Should I be cutting thinner grooves than a circular saw blade? Closer
>> >> > together? Deeper? Shallower?
>> >> > Thanks!
>> >> > - Gardner Pomper
>> >> >
>> >
>> >
>
>

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