Subject: Re: [harryproa] mast pipe
From: "Rob Denney" <>
Date: 1/26/2007, 7:50 AM

For small pieces put it in the oven, or shove a heat gun in one end.  When it gets to about 80C, the tube shrinks and is easily removed.
For longer pieces, you can cut it in half lengthwise, remove the pipe then glue the halves back together and wrap them with a layer of double bias.  For highly loaded, or minimum weight parts, wrap a single layer round the tube, with an overlap.  Place a piece of plastic between the overlap and the piece under it.  When cured, carefully unwrap the laminate to pop it off the mandrel.  Then apply a little glue to the overlap, place it back on the mandrel and let it cure.  Then add the rest of the laminate.
Do not put tape or plastic on the mandrel if you intend removing it lengthwise.  It will ball up and jam very tightly.  Apply enough pressure to balled up Gladwrap.Clingfilm/Saran Wrap and it will turn to white powder, but still will not release.
----- Original Message -----
From: Doug Haines
Sent: Friday, January 26, 2007 12:50 PM
Subject: Re: [harryproa] mast pipe

G'Day Phil Keck,
  Hi, I built and am still building as it needs improving an elemenatrry, and have a query as well on the plastic pipe. This is also used for tiller extensions and I used it as a mold for part of my masts.
  My plans combine the pipe with reinforcing of glass for strength, so the type of pipe is not important, though I beleive you can get thicker stronger pipe you'd save weight by getting thinnest pipe with extra glass for strength. The pipe provides a mold basically and a nice smoothe inside surface for rotation of the mast.
 However for say the tiller extensions and what I plan to do for the sun shade frame, I would like to wrap the glass, or better carbon, round pipe, then release the two parts to give a better strength to weight ratio. Even a small thing like tiller extensions get quite heavy without some better building.
I do not know how to release the two - perhaps some one could advise.
Eg. a mast made spinning carbon on a , is it called a madrel or something? must use some release wax or something. I read abot carbon compression or something when you bang on some carbon, it was in a windsurfing mast are when handling not to drop it on the ground literature.
Also Phil Keck, the Kiri is so weak that the glue is stronger so I think the toungue and groove you're talking about will not do much. You couldn't fit it in anyway as you go round the corners they meet on an angle - hence requiring narrow strips.

pkeck2 <> wrote:
On this page:

Are the mast pipes just made of regular PVC pipe?


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