Having been one of the more recent builders of a jig-built Heron a
couple of years ago, I can offer the following, based on my
experience using the NSW jig built by the irrepressible Don
Jamieson:
You will end up with a boat that closely approximates the shape of a
Mark 2 glass boat. They are light and fast.
The easiest and quickest part is cutting out the frames using the
full-size templates, so I wouldn't go to the bother and expense of
having them CNC cut. The NSW jig comes with full-size temples for
all framework.
The most economical way is to purchase the required gaboon ply and
western red cedar in 150x50 x3600 and cut it up yourself. Buy a
cheap mini bench-type rip saw from Bunnings for $100 to rip down the
cedar for all the stringers, gunwales, hog, keel etc. Almost none of
it is seen when the boat is complete so the quality of the finish of
these parts is unimportant.
The hull itself, ie. the part of the project before turning it the
right way up, is fast and easy to build. The external surfaces are
not seen as you should either glass it yourself or give it to a boat
builder. This means you can simply drive screws into parts to hold
them while the glue sets when clamps are difficult to access. (BTW,
go and buy a cheap pack of assorted clamps at Bunnings). All
fastenings are removed when glue is set. A sheathed boat adds a few
kilos, but will still be underweight if you're careful. The hull
will be stiffer and equivalent to a glass boat in finish (well, mine
is, as is Warren's -see below).
The slowest part is fitting the seats, tanks and deck. This is all
hand fitting. There is no possible way that any boat kit can be made
to avoid neat hand-fitting tank sides to the floor and hull sides
(at least to my eye, unless a whole lot of quad covers are used to
hide the gaps). However, if I was to do it again, I would (somehow)
make the side buoyancy tanks before fitting the bottom and sides of
the hull, ie. while hull still upside down.
Do not bother with a half-height front buoyancy tank. Full height is
much simpler and gives more buoyancy (and less water in boat)
following a capsize.
Warren Monaghan had the right idea when he built his (the most
recent off the NSW jig I believe) - he didn't bother staining the
ply at all and had Maxy Boats glass the hull and spray the deck and
interior with clear 2-pack.
Other necessary tools - stapler, to hold down deck parts when glue
is setting; a good, and I mean good jigsaw with adjustable sole
angle. Buy some nice fine-tooth blades - not cheap ones; you'll also
need a Stanley plane and cordless screwdriver/drill.
I used Epiglass resin glue - 4L resin/ 1L hardener. With this
quantity I was also able to dynel sheath the hull. It is clear resin
that you turn into glue by mixing with microballoons. This way you
can control the consistency. Warren used an epoxy glue (in pots)
which is possibly easier to use. Norglass?
A box of 100 latex surgical gloves will stop you getting glue all
over your hands.
It will take some time to complete. I took my time over 18 months.
Warren did his in just under 12months if memory serves me. That's a
few hours for a few evenings each week and a few hours to a half-day
every other weekend.
Anyone who is willing to take on the project will have any number of
experienced builders able to offer advice on any step of the
process.
The result? Priceless.
Steve
--
You received this message because you are subscribed to the Google
Groups "Heron Sailors".
Please feel free to reply to this message to keep discussions
going.
--
Stephen Watts
0403 815 889