No, does not have canted hulls. The Capricorn origanly came out with them but it was quickly outlawed by the F-18 class.
That is not true.
Capricorn never came out with canted hulls, it came out with inward canted boards. Canted hulls are allowed under F18 rules, although no builder makes use of this nowadays, but canted boards that are canted away from the centreline of the hulls are forbidden now by F18 rules.
Wouter
Wouter Hijink Formula 16 NED 243 (one-off; homebuild) The Netherlands
..and here is a press release from same regatta, about the Capricorn...
On Sunday November 4th 2005, Stuart Gummer and Gillian Power had a flying start of the 15th Aruba Heineken Catamaran Regatta. The British F18 sailors took two bullets in the first two races and are leading after day one. John Moret and Gijs Jannink (Tornado, NED) are in second position, followed by Richard Allen and Simon Farren (Tornado, GBR). After a big squall during the practice race, it cleared up in the afternoon and the 15 knots wind pleased the competitors.
Gummer and Power were less fortunate at the Aruba Regatta 2004, as their boat was destroyed in a collision. They switched from the Spitfire to the F18 class and bought a Capricorn. Gillian Power: “It is not only great and fast, but also nice to run up with the Tornado’s now.” And today, they beat them all on rating (after calculation). “We have to beat Mischa Heemskerk, since he finished ahead of us at our F18 nationals”, said Gummer with a smile on her face.'
Performance Cats lists the N17 and N20 as having 4 degree canted hulls, as well. Interestingly, the Nacra F18 does not list canted hulls in their specification, thus - if F18 class rules prohibit canted hulls (not canted boards), is the Capricorn F18 legal?
Re: new Nacra F18#60134 11/09/0512:35 PM11/09/0512:35 PM
It seems to me that a jibing board will operate at the same angle of attack as a conventional board. The reason is that the leeway will increase until the board produces enough lift to match the loads applied by the rig, and the contribution of the hull at low leeway angles is probably small compared to the board and rudder. The board is going through the water with essentially the same orientation whether it is jibing or not, because it still needs the same angle of attack to produce a similar force.
So what you're really doing is rotating the hull relative to the board. This has implications above and below the waterline.
If the hull is generating a significant amount of lift, this load will be shifted to the board, which should be able to carry it with less drag than the hull, due to the much greater span of the board. However, if all the hull lift is eliminated, this reduces the effective span of the board to being the same as its physical span. So there's a benefit to having the hull carry some of the load, as long as it doesn't cause flow separation or shift the lateral balance and increase the rudder trim drag. From a lift-induced drag point of view, the optimum hull load would result in the wake coming off the hull being deflected sideways at the same angle as the wake coming off the board. You want the whole vortex wake shed into the water to behave as if it were a rigid sheet along the whole span from waterline to board tip.
Obviously, it's hard to determine just what amount of lift this is without a very sophisticated calculation or test program that takes into account the board, hull, and free surface.
I suspect the greater effect of a jibing board comes from the rig rather than hydrodynamic effects. Rotating the hull makes it act like a ballestron boom. This opens up the angle between foretriangle and the apparent wind, effect
This is what Tom Speer wrote on the subject in 2002. You will not know until it's tested.
I believe the original AHPC F18, which was a modified Taipan5.7 had canted hulls. This is from the F18-international.org website HISTORY In July 1996 Pieter Saarberg write to Jim Boyer asking him to investigate the possibility of modifying the Taipan 5.7 hulls to suit the F18 formula. His reasoning was that the present designs of the F18 did not offer the quality of workmanship or fairness of hull shape that the Taipan 5.7 did.
The prototype Taipan F18 was shipped the following January. The first season was less than successful, with many teething problems, for the second season Pieter invited Scott Anderson to use the Taipan F18 in the around TEXEL race, the only chance Scott had to tune the boat was the 20 minutes waiting for the start. Scott won. At last the results are on the board.
PLATFORM Based on the Taipan 5.7 The Taipan F18 is built from all woven and unidirectional fabrics, this gives an exceptionally stiff hull.
Throughout the Taipan F18 we have endeavoured to use the extra weight to advantage, rather than just add ballast to bring the boat up to weight, needing 30 Kg in the platform alone this has been a real challenge. Vinylester and polyester resin are used in the construction. Framing low density foam with fiberglass reinforcing, to enable the Taipan F18 to meet flotation regulations, this type of frame is also better as the frame footprint onto the hull is large reducing local skin loads. Beams are 3mm wall by 100 mm diameter Aluminum, mounting points use brackets to prevent any movement between the hull and beam.
Rudders are standard 5.7 / Tornado, we have increased the weight a little, but not too much as excessive weight makes the foil difficult to handle. The centreboards will be increased by a few Kg, but not to the maximum for the same reason. Their size is 300mm X 25mm X 1100, as I am very doubtful of the benefit of the very long narrow boards seen on some other F18’s, the shorter boards are also far more practical when leaving the beach.
The hull is a modified Taipan 5.7. 100mm trimmed off each end. We are delighted with the resulting hull, it is fair and well balanced with the correct amount of rocker. The Taipan 5.7 was designed to carry up to 340 kg (140Kg Boat & 180Kg Crew), so the modification to the F18 is an ideal shape to carry the 180kg boat weight and 140 kg crew. The bow is taper cut so that the bow remains fine. I know from past experience with the A-Class, and Taipans that it is better to keep the bow fine rather than trying to increase buoyancy in the bow, as the boat will tend to "trip over" a more buoyant, wider, bow.
The Hulls incorporate our usual nice touches such as built in chain plates, and internal trampoline tracks, which we pioneered.
RIG Using his Taipan and Tornado experience Sailmaker Greg Goodall started with a clean slate and designed the rig from scratch. He chose the same "wing 158mm x 74mm" section as the Taipan 5.7, and added a radial cut main and jib . For the Spinnaker Greg and Pieter Saarberg Decided that Experience counts and chose one from a Dutch loft that had a reputation for making fast spinnakers for catamarans.
Lance Taipan 5.7 USA 182 Palm Harbor, FL
Re: new Nacra F18
[Re: Lance]
#60138 11/10/0503:55 PM11/10/0503:55 PM
The bottom is slightly flattened out (not as much rocker), and yes it seems to be better for downwind performance.
The boat that I was on had the standard “old” rig. I did not hear that there was a plan for a winged mast. I am sure the rig will change a bit due to the testing that went on, but I cannot tell you how.
It did have canted hulls, which also cants the daggers. This requires there to be two sets of molds, one for each hull. There was a bit of testing on the placement of the daggerboards (rake angle, forward or back) to figure the optimum arrangement. I am sure that they got them right.
The hulls are wider, about 25% (maybe a bit less than that) at the waterline, than the older boat, making it very buoyant. Sits high in the water. I liked sailing it.
Later, Dan
This is a drawing that Paul te Buck of Holland sent me. It is pretty acurate. I think that the hull length in front of the crossbar may be a bit exaggerated. It is almost the same dimensions as the pre-2006 model.
Thank you for the heads up John. I asked Jack if it would be the boat for the Alter Cup 2006 and he did not have enough information to go on. Basically, it is going to Europe first. Sounds as though there are already lots of orders from there. I think that the USA is still rated a second class citizen in the Formula 18 World.
While it might be that way - we're behind a little in speed and technology in F18 here in the US...it doesn't bother me that they're going to Europe to get finely tuned first.
That is not it. The 2006 boat that is made right now is white. There is more hull bouyancy on the bottom, similar to Capricorn and A2. It is also a lot wider in the girth than this picture. I think they will make slight mods to the hull making sure that it is the way they want it asthetically and functionally.
I do not think that you will be impressed by a picture taken from the front like that.
If the 450s are sent to the event does that mean it will be a single handed race? I do not think that any of the teams that showed up in Long Beach will be able to fit on that boat. I hope Kirk sticks to his guns about not being able to sell the older boat.
![[Linked Image]](http://members.aol.com/ddelave/sailing/2006Nacra.jpg)
![[Linked Image]](http://www.sailinganarchy.com/fringe/2005/images/prelim.jpg)