Three of the technologies that have been developed (one patented and two patents pending) are:
Planing watercraft (yachts to kite boards and sailboards) with High Lift Surfaces, that reduces the speed needed to plane by about 30%. This is due to an increase of lift to drag of about 100% at transition speeds through slow to medium planing speeds of hulls with these high lift surfaces. Roughly 50% is due to increased lift from the cambered surfaces and 25% is due to the rocker surface in front of the camber, which makes the lift vector more vertical, thus reducing the dynamic drag. This is only possible due to the details of the size and position of these surfaces.
Figure 7 shows drag data for 1/2 scale models of
sailboards with and without the High Lift Surfaces. Series 2 shows the
data for a model with a high lift surface. Series 1, 3 and 4 are for
previous 1/2 scale models which do not have the high lift surface.
Thus the lift/drag is increased by 100% or more at least from 6 to 23 mph
.For series 1, 2 and 4 the Center of Gravity, CG, was shifted for different
speeds over the range that a normal sailboarder would shift their CG.
In series 3 the CG was not shifted.
Where series 1 and 3 are for the yacht model on waves and flat water,
series 2 is published yacht data adjusted to the same length of 160 cm as it is on the model.
For a yacht and this data, the position of the CG was fixed
2) Sailboards with winglets and winglets with slots. These allow the boards to plan at low board speed and less wind for a given sail size. They do this by a) allowing water to produce lift both on top and under the winglet and b) reducing the wave drag when the said water on top and under the winglet come smoothly together behind the board thus greatly reducing the wave drag. One of the “Windray sailboard” loses its wave drag at 6 mph (10 km/h). Another board, with only 105 L, loses it at 7 mph. This later board is shown after “2)”
Top/back view of Cat Ray which loses its wave drag at 6mph.
In displacement mode the side winglets are mostly under water thus its wave drag is like that of a narrower board.
At 6 mph the water on top of the winglet and that
under the winglet come
smoothly together. The board is very quiet at this speed. At 6mph it
still has some displacement lift but has mostly planing lift. So Cat Ray essentially planes at 6mph.
This board has a winglet with a forward slot, using the Coanda effect. The slot is in the water when the board is starting to plane giving lift from both sides of the winglet. It is mostly out of the water when planing fast.
step, which allows a) the board to plane as if the step were not there,
b) unlike other vented or unvented steps has almost no turbulent /wave
drag and c) dewets behind the step at about 14 mph to reduce both the
wetted surface area and the lift at the back of the board thus further
reducing the wetted surface. These steps therefore increase the board
speed without affecting the planing characteristics of the board.
105 L Ray Board. Its Camber/slope step makes it very fast.
Bottom view of Cat Ray. These steps are unlike other sailboard steps. They were designed from both theory and experiments.