Originally Posted by Boatguy30
Rob certainly has a whole great rational for these designs. I personally don't see how they improve on the standard catamaran concept
except perhaps in cost, but it is possible to build a fast, roomy not to expensive cat out of many different materials.
It is commonly agreed that proas provides the most performance for the least money
. And that they have drawbacks in terms of handling, righting moment and room.
Harryproas overcome the drawbacks without losing the performance or the cost benefits. The reasons for this are explained at The Harryproa Concept |
Beyond this, the latest harrys are special for two reasons.
First, they are simpler, quicker, cheaper and, uniquely, cleaner to build.
The hulls and and decks are infused in simple moulds made from mdf. These moulds do not require any filling, fairing or polishing.
The laminate is then laid up dry in the moulds, including variations in core
and laminate, local reinforcing, holes for masts, beams and skin fittings, slots or self aligning joins for all the fit out, the plumbing
and the electric cables
This is then infused. A near magical experience for anyone who has hand laminated a hull
The shelves (including edges, lips and cupboards), bulkheads (including hatches, doors, doorways), bunk tops (incl hatches) and the rest of the fitout are infused on a sheet of mdf.
The shelves etc are glued into self aligning slots in the hull/deck halves, which are in turn glued together, ready for internal and external high build paint
There is no cutting, grinding or sanding
of cured glass, wet laminating, filletting, taping or fairing.
The boats are quicker to build, there is less waste, close to no mess or dust and minimal exposure to toxic materials. The laminate is perfect, and the finished job is appreciably lighter than conventional methods.
Intelligent infusion contains no new skills, apart from the infusion itself. It is the culmination of a lot of small things put together to make building easier, cheaper and more enjoyable.
Infusion is a very easily learned skill, requiring a $250 vacuum pump and low cost materials from the hardware
store. There are hundreds of 'how to" videos on line and the plans are very detailed.
All this is in sharp contrast to "standard cat concepts".
The second unique point is the tender
. On the 50, it is 6.2m/21' long with a large outboard
. It is hinged to the beams and stored in an open space on the bridgedeck, where it doubles as the in situ propulsion
unit for the mothership, further reducing the weight and complexity of the build.
It has more speed, stability, payload, range and seaworthiness than a conventional tender and it's weight is central rather than rather than weighing the stern down in davits
For those rare times that a smaller tender is required, the front half can be unbolted from the back to provide a conventional small tender.
For clarification of any of the above, or more information, feel free to email
me at email@example.com