Mar 24, 2014

Grainger new Trimaran line: Cruise, Race & ...foil ?




I've been publishing Tony Grainger work since day 1, and every year his designs get better. Now Tony has updated his Trimaran line with two models: The Scoundrel 22 (yellow) and the Rascal 25 (red).

Grainger also has developed a way to route the divinycell/airex assembly parts to simplify one-off construction. This method its been used for his cruising cats too for a while now.
Now he has improved the system, and I've been talking with him to implement it for the F18 OP.

On these new Multis , they have a folding system similar to Farrier's and he is working on a foiling package for a near future test. Additional details at www.rocketfactorytrimarans.com
For more info contact Tony at www.tonygrainger.com.
Interview for more details next week
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Sent by Tony Grainger:
Two New Trimaran Designs
"The motivation behind these designs was to put forward a package of features that would appeal not just to existing multihull sailors, but to a whole spectrum of people who would like to combine the features of a performance cruising trailer yacht with the ability to have some serious performance potential as well.
I’m thinking of the sort of people who take their racing quite seriously, typically the owners you see at the front of the fleet in the major trailer yacht regattas, or the Australian Multihull Nationals and events such as the Kings Cup in Thailand.
These owners are constantly tweaking their rigs, their foils, and generally optimising the boats both for rating (OMR) and for sheer boat speed.

To this end the new designs offer the latest in design thinking for multihulls with the rigs and beams well aft, high buoyancy floats, twin rudders and the possibility of fitting a canting rig and possibly foils for full flight in the future as the technology develops.

The beauty of this concept is that in a trimaran in this size range you can do it all without seriously compromising the cruising accommodation. Even in the 22’er you can sleep three adults in the main cabin (four at a pinch) and if you fit an aft cabin the berth is almost a queen size without really compromising the boat’s lines.

By incorporating these features with the folding system you have a very versatile package and a lot of scope to optimise the boat for the sort of sailing you want to do, and it can only be good for the resale value.

Can we achieve lift off?
With these boats we don’t have the power to weight ratio of an A class, C Class or Flying Phantom,

but we do have a lot of stability, both fore and aft and sideways. There’s no class rules that restrict the beam overall and the rig configuration gives us a long wheelbase so we can get good separation between the rudder tips and the primary lifting foil. The dynamics will be different from a lightweight beach style cat and the foil design will have to account for that, but I think with some concerted R and D we can get these creatures to lift right out. The foil system needs to be practical, that is for the foil to be fitted from the deck.

The engineering work is being done to allow for full flight foiling so retro fits won’t be a problem and we may even fit foil cases as a standard feature, but the first focus is to get some boats on the water and look at the foiling option at a later time.

The first few boats will be built as one offs while we look at the options for producing kit sets, or possibly getting them into full production at some time in the future.
www.tonygrainger.com

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