Subject: Re: [harryproa] telescopic mast
From: "Rob Denney" <>
Date: 6/11/2007, 12:20 AM

The mast bend characteristics can be established pretty accurately by the engineer regardless of the dimensions.  In theory.  We will see how it goes.
The workshop was fantastic!  12 people (about equivalent to 3 boatbuilders working full time once all the talking and learning had taken place) attended and we got the two half hulls and the deck infused.  Hulls are gel coated above the water line so no fairing or painting is required.  There were a few materials related hiccups, so we did not glass or fair the half hulls after the below waterline shaping was done, but this is not a huge job. If we did it again, the whole lot would be completed in the 4 days, which is a quantum leap quicker than any other one off build technique.    Derek's deck edge radius is a stroke of genius, so joining it all together will be very quick and accurate. 
It all looks fair, but we won't know for sure until the rest of the glassing is done and the frames removed.  The wet out and laminate consolidation is 100%.   Vinylester resin still smells, but infusion is so much better, lighter, quicker and less wasteful than hand layup that there is no comparison.  Bag the job, pour the resin into the bucket, open the tap and 15 minutes (mostly spent ooohing and aaahing) later you are sitting down with a cup of tea, with half a 50' hull curing on the table.  450 gsm or 2,500 gsm, it all gets wet out with exactly the right amount of resin; no voids, no dry spots.  The solo lee hull is pretty small, but the same technique and timing will apply to any size hull. 
There were 6 (including Mark and I) pro strip plank builders present, all of whom were convinced that this is a much better way to build boats.  The materials cost was $5,000, which included tailoring the foam, which was so easy that it would have been cheaper to do it our selves.  Strip cedar/epoxy are similar materials cost, plus paint.  
There will be some photos on the web page soon, and a weight analysis.
A highlight of the workshop was Derek, whose knowledge of the technique made it all very easy and enjoyable for everyone from the  the know it alls who didn't, to the completely inexperienced.  His tales of the early days of multihull development and short handed sailing were a large bonus.
We all had such a good time that we are going to have another workshop in August to build the ww hull.  Only half as long, but more complex due to the cantilevered bunks and cockpit.  It will even be possible to infuse the complex curves of the seats and include the washboard track and hatch surrounds in the laminate. With the deck edge radius, all 7 parts (2 hull halves, deck (including cockpit cover) 2 seats, bunk base and bunk wall will slot together with no additional glassing or filleting required. 

On 6/8/07, Doug Haines < > wrote:

also like to go to one one day

Robert <> wrote:

Rob and Mark,
Just looking through your info on the transpac, and wondered how you
get round the changes in stiffness and strength indicated by the top
section being fatter than the bottom.
Looking forward to seeing how the workshop goes and sorry I couldn't
make it,


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