Subject: Re: : Re: [harryproa] Re: extruded polystyrene core questions
From: "Rick Willoughby rickwill@bigpond.net.au [harryproa]" <harryproa@yahoogroups.com.au>
Date: 6/4/2018, 4:04 AM
To: "harryproa@yahoogroups.com.au" <harryproa@yahoogroups.com.au>
Reply-to:
harryproa@yahoogroups.com.au

 

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:
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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Posted by: Rick Willoughby <rickwill@bigpond.net.au>
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