Subject: Re: [harryproa] Conoc sections
From: "Rob Denney" <>
Date: 11/23/2006, 9:46 PM

Glassing inside first is good as long as there are no core joins in tightly curved pieces, in which case a kink appears.  Bog in the join while it is flat may overcome this (i haven't tried it).  The Polycore crushes evenly on the inside (no creases) as long as the bending is done slowly. 
No idea whether it is worth the hassle, but Polycore can ship direct to you from China, so I suspect that it will be much cheaper than the Nidaplast.

----- Original Message -----
From: Rudolf vd Brug
Sent: Friday, November 24, 2006 4:14 AM
Subject: Re: [harryproa] Conoc sections

Why not glass the inside first?
At the moment I am fiddling about with Nidaplast. Small test pieces only, but I found bending with the glass on the outside
made the inside crease.
With glass on the outside it developped a nice even shape.
----- Original Message -----
From: Rob Denney
Sent: Thursday, November 23, 2006 1:28 PM
Subject: Re: [harryproa] Conoc sections

Good thinking.  I am building 2 x 6m/20' pieces, joined at the mast, with all the external carbon added after it is joined.  The removable ends will be built seperately.  Could just as easily join it at the beams.
KSS would not allow the one join oval sections, nor the squashed cones. 
Glassing part of the Polycore is not a good idea, as you damage the scrim when you sand it to get a key for subsequent layers.  Welding on a piece of scrim may work, or if it is an inside curve, bog should do the trick. 
----- Original Message -----
From: Robert
Sent: Thursday, November 23, 2006 11:38 AM
Subject: [harryproa] Conoc sections

Been thinking of Harry bows on the lw hull. The sections forward of the
rudders could be built using the squashed cone idea. If the the centre
section of the lw hull with all its fiddly bits with the rudders and
mast bearings could be built separately and the bows added on later it
could be built in a much smaller space and making it much easier to
work on those fiddly bits. This a fairly natural place to have a change
of curvature and needs a bit of fairing anyway with the rudder
reinforcing. The fact that the hulls could be fair to well above the
water line suggest that hulls could be built using a KSS process with
no cutting or shutting below the waterline.
I was wondering about the problems of bending the halfglassed polyprop
and whether the joins could be made where you want the panels to be
near flat and pre tape them with glass tape. Or possibly weld a strip
of scrim over the joint

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