Subject: Re: : Re: [harryproa] Re: extruded polystyrene core questions
From: "'.' eruttan@yahoo.com [harryproa]" <harryproa@yahoogroups.com.au>
Date: 6/4/2018, 4:42 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

It is my understanding that wet layup is unable to get low resin ratios needed to exploit carbon.

On June 4, 2018 8:04:25 AM UTC, "Rick Willoughby rickwill@bigpond.net.au [harryproa]" <harryproa@yahoogroups.com.au> wrote:
|There is no infusion involved. The removeable frame simply holds
|floppy panels (with inside sheathed as flat panel in single sheets) in
|position while the outside of the hull shell is sheathed in one go. It
|avoids handling long panels that flop about and taping the chine seam.
|The radius of the seams is limited by the thickness of the core.
|Selecting smooth cloth weaves like twill or double bias reduces the
|amount of filling. Using the frame, it is possible to achieve a fair
|shape so there is no filling involved to get fairness.
|
|The usual method of stitch and glue is to sheath both sides of the core
|as flat panel, That requires taping the chine seam externally then a
|lot of filling to fair out the seam.
|
|The current frame is 8m and that is the longest I have done.
|
|I have seen foam “planks” laid up on a round bilge male strongback,
|faired and then sheathed in one go on outside before turning over and
|removing from strongback to sheath the inside - like this:
|https://www.jacobadoram.com/thebuild/
|<https://www.jacobadoram.com/thebuild/>
|That is a lot more complex than flat panels.
|
|
|> On 4 Jun 2018, at 2:02 am, lucjdekeyser@telenet.be [harryproa]
|<harryproa@yahoogroups.com.au> wrote:
|>
|> To make sure I understand this technique with respect to "intelligent
|infusion": the frame replaces like a male mould; the outside corners
|are hardly rounded; the finishing outside surface is not as smooth as
|with vacuum bagging; installing the bulkheads requires the usual
|filleting and sanding;
|>
|>
|> Up to what size boat would you limit the use of this technique? Thank
|you in advance.

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