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RC One Metre

Update: IOM production is currently on hold pending development of new tooling.
As ever it is important to set clear priorities in order to maintain quality. 
Our philosophy is always to take on projects where we can really push the state of the art and come up with great products. That requires the right investment of time and resources.
In this case our other work, and maintaining continuity in our M Class development, have had to take precedence. 

We will review the possibility of tooling up for a new IOM in the second half of 2015.

If you would like to purchase plans or discus a one-off project, please feel free to contact us.

Meanwhile, here is the story of our journey in the IOM Class so far


Black Ice is the eighth IOM design by Dario Valenza. 
The current boat is a development of Light Ice Mk2. 
Scroll down after this description for a detailed account of our development journey so far.


At 202mm, max beam is just on the narrow side of the class consensus. 
The concept is to have sufficient form stability to hang on to the big rig as high into the wind range as the other mainstream designs, with minimum drag penalty. 


This is achieved through careful manipulation of the section shape and volume distribution. A high forward prismatic ensures minimum wave drag and good pitch damping.


The semicircular midship cross sections are optimised to maintain balance and trim without discernible ‘steps’ through the heel angle range. In other words the boat does not have to be pressed to optimum heel angle for wetted area and other hydrostatic values to become optimal. This contributes to linear and predictable behaviour, allowing automatic micro-adjustments without continuous inputs from the helm. Hydrodynamic and hydrostatic centres are painstakingly constrained to render a smooth and seamless transition as the hull is heeled progressively.


The deck is all new, bringing our IOM design into line with our current thinking in other classes. There is a mast gate at gooseneck level to offer both fore/aft and athwartships support to the rig. However, unlike the current trend in the class, there is no sharp step in the deck. Instead the peaked foredeck flows smoothly aft for minimum aerodynamic drag, efficient water shedding and enhanced structural rigidity.
As well as improved detailing throughout, such as concealed turnbuckles for the shrouds, the most innovative feature of BlackIce is a novel fin box arrangement optimised to class rules. The arrangement takes advantage of the rule by minimising fin weight and re-investing some of the mandated hull mass in keel support structure.

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Previous Designs
Listed and described from oldest to newest.

Ice, Design IOMDV01-01 Through IOMDV01-03
Dario was introduced to the IOM class when he accepted a commission to optimise Paul Armstrong’s first One Metre Rush. Paul created the original prototype using his considerable 'feel' and his surfboard shaping skills. Before commissioning Carbonicboats he had been sailing for a few months with mixed results.


Rush was quite a powerful boat with a wedge shaped deck plan, wide beam and generally powerful sections. The sections were not arcs of a circle in the style of the TS2 but rather arbitrary curves with more volume outboard, somewhat like a contemporary Volvo 60. 
The deck layout had a flat foredeck and a plain step down into an open 'dish' cockpit. The original prototype was planked in balsa with hard gunwales and had been used to form a second prototype in glass/epoxy.


Ice (blue boat above, light gray and orange boats below) was the result of this optimisation. 
It was still a fairly wide 'planing' boat but the hull shape, volume distribution, foils, centres and deck layout were significantly altered. 
The changes added up to a measurable gain in performance and consistency.
The bow was fine, elliptical in underwater section and slab-sided. It opened gradually to a flared midsection and tapered in a bit at the stern. 


As well as a considerably tweaked hull, the final production version of Ice had a rectangular fin and a very elegant semi-elliptical high-aspect rudder. 
The deck was exquisitely shaped with a complex 'saddle' curve in the foredeck and moulded-in mast partners. 
Ice enjoyed a prolific production run with examples sold around the world including to Singapore skippers.


LightIce, IOMDV03-01 Through IOMDV05-02
Though Ice was performing and selling well, the limitations of the 'skiff' type were becoming apparent with fleets worldwide migrating toward more moderate and conventional all-round boats.
Enter LightIce, a completely new design. 


LightIce pioneered a concept that has since been widely imitated. Dario campaigned this design in Auckland in 2001 and 2002 while he was involved in the 31st America's Cup. 
At the same time a number of skippers as far off as Malaysia and Canada provided feedback that helped refine and tweak the details during the evaluation phase. 


Very little changed from prototype to production, the single largest change being shifting the fin aft by 4mm.


The appendage design was refined by optimising foil section, planform and area. 
A flattened bulb was introduced beginning with Design IOMDV05-01. 
The cockpit shape evolved with the introduction of firmer corners for greater rigidity.


Detailing included fairings to deflect water ahead of the standing rigging as well as integral mast partners. Access was through a single cockpit hatch and a foredeck hatch, both moulded to fit into recesses and secured with adhesive edge patches. A radio gear pot could also be installed if desired.


The sailing pictures shown are of Dario's own Light Ice '33', courtesy of Francesco Binetti. 33 is now in Italy and has been purchased by the owner of the Joe Fly racing team after being campaigned by Francesco.




Light Ice 2, IOMDV06
This boat is very much a linear evolution of LightIce 1. After extensive testing and competition, the inevitable list of desired improvements became big enough to warrant investment in new tooling. Overall beam was very similar, an increase of 4mm being primarily due to the revised volume distribution.


Centres and maximum beam were moved forward to the practical limit dictated by the one-design jib boom length. The principal difference in section shape was a rounding off of the distinctive 'U' shaped bilges found on the previous boat. Priority was given to handling and balance. Careful attention was paid to maintaining a smooth transition in heeled underwater shape.


For practical reasons the deck mould was carried over. Only minor changes were necessary to accommodate the modified beam distribution. After testing of the new hull shape returned satisfactory results, attention turned to the foils. A revised fin section was tested and found to be satisfactory.


The next stage in the programme involved refinements in fittings, rig setup and sailmaking.


Orbit, IOMDV07
Orbit was a purely experimental design with the aim to explore handling, balance and manoeuvrability. The section shape was derived from pure arcs.


Careful attention was paid to prohibiting the migration of the hydrostatic and hydrodynamic centres with heel. The result was a similar waterline beam to the other contemporary production boat but considerably greater beam on deck.


Tiziano Desmatogiovanni from Italy constructed the tooling and tested the prototype. Results were used to calibrate our in-house software and were valuable in informing the next generation of IOM designs.





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