Pretty much only a WETA can pack up small and can be sailed with one, two or three sails blazing by one, two or three people! It is an extremely versatile little boat so no wonder it was Boat of the Year in 2010! Composite foam sandwich hulls with Carbon spars and beams make this little trimaran as robust as it is versatile. A trimarans legendary forgiving nature means that anyone can jump on the Weta and immediately feel confident enough to push it to any level. We are excited about the Weta Fleet building up and are looking forward to some great events for all.
Seems we haven't scratched the surface yet! Like a dinghy getting ready to plane... We are alomost there!
Here's some snippets from the work that's been put in by Danny Moore. Danny's other boat is called 3itch, she's 37' long, all carbon, goes like the clappers and was designed and built by himself. We don't know how many boats he's built but its a lot. 3itch is out flying the mainhull and in the shed there's another big cat about to splash. The Sushi Roll project is an easy way to test some foils before the big Cee's make their way into the big 3itch!
WETA is beta!
From the first test sail without the Tee rudder the effect was quite dramatic. Dramatic in the way the foil never let the ama dive!
In Singapore we have two distinct seasons that are punctuated by light shifting winds. The day we tested for the first time, it was a light doldrums kind of day. Pushing off into 5 knots did not look promising but it is good to test slowly.
The first thing that became apparent was the roll damping. Our sailing area is inundated with all kinds of traffic including ships of all sizes that kick out various sizes of wakes.
Invariably this run along the same path that we were sailing. In the light-air beam on waves normally created a nasty roll and slap slap on the Weta. The C-Foil was absorbing much of that energy. So the roll motion was greatly improved and much more comfortable.
We sailed for about an hour in very light air. The common observation about foils was, observed. That is where the speed doesn't allow significant lift to be generated at the expense of more drag.
Ok, make the snip. It might be hard to cut into a new boat (not). Well not when the operation could change the face of it a whole lot.
The idea started with "the Weta would make the ideal platform to have a foil because it's got these very small amas that we keep burying".
The conversation ended with,
"yeah and a whole lot cheaper to experiment with that size than anything else".
A week later Danny appeared with a bent something in his hand.
"This is giong to be the Weta's C-Foil"
"You made it already?"
"No i printed out the dummy, you dummy!"
So it was that the Sushi Roll Project was well underway. From the plastic print out, three weeks later a Carbon version was delivered. Time to get cutting!
Cutting into the Weta's ama just required a little precision but it went in very easily!
This is a scable project. You see the real boat that will benefit at the end of the day is a 30 something all Carbon tri.
Danny is quite the genious and by his flow calculations we see 200 kg of lift at 12 knots based on the angle and speed on trial sail on, 27th September '15.
At 5 knots it only produces 35 kg of lift and 0.4 kg of drag. At 15 knots the lift is 320 kg at 3.8 kg drag then it jumps to a whopping 520 kg at 20 knots with 6.8 kg of drag.
The tee rudder is planned to reduce the angle of incidence as the speed increaess thereby reducing drag but still maintaining 100% lift. Those figures are impressive enough and certainly add a lot of lift to the Weta which tips the scales at about 120 kgs.
Danny's other tri' is due to have foils put into the ama's. Initially Danny had some reservations about it but an afternoon on the Nacra 20 Carbon with its C-Foils so had him back on the right path "FAWK".
Let's go make carbon Sushi Rolls then!
Test the Tee
It was planned all along to have a Tee-rudder but it just wasn't ready by the first test sail. So on the test sail (see video) would have had the front of the boat in a positive angle of attack and the back 'dragging'. The Tee Rudder will lift the back of the boat just to allow the foil to run at 2 degrees positive and that will keep the drag down and hopefully, the speed right up.
At full tilt (20 knots boat speed) the Tee will lift to the tune of 100kgs. That's enough to get a move on!
After the first test sail an end plate was added to the C-Foil. This might be hard to measure but the tip losses should be reduced with the end plate. The Carbon foil is so stiff, like it is solid there is no way that will fail!
It fits like a glove!
Apart from the slots in the ama, the only other modification to the ama was adding a small strut between the upright and the front beam. This was just added in case the lift from the foil indiced any torque into the hull and then the beam upright.
Why bother with wheels when you can have wings!