I have been getting to know the Heliciel Software, although the dialogs are mixed between French and English and the UI design is unusual, the program has the tools to apply to creating and estimating the optimum foil wing and propulsors. It is definitely increasing my understanding of the dynamics of the shapes.
In order to learn more about the design process, I am happy to enter some suggested foil dimensions and share the resulting lift and drag results here.
Here is how a foil is specified within the software, foil is selected, ocean water, 10 degrees C, the profile dimensions on this diagram page shown below are not to scale, they are schematic. You can also choose a profile from the database or input/import your own foil profile. Below is the image of some of the NACA profiles. Source here. Based on nothing whatsoever, I choose a NACA0010 that has a thickness of 10% of the chord length. Half wing length of 300mm, width at the root of 160mm and width at the tip of 80mm are entered. A design target of 10 meters per second is specified.
Curvature is specified in another dialog and left out for this first post.
Figures shown are half of the total values as the program is only estimating one side. At 36KPH, this wing will have a lift of 2800 Newtons, a drag of 42 Newtons, and a calculated 1800 Watts to overcome the drag of the full wing.
Doing a further analysis, the program cruches away and returns this chart showing the lift and drag at various speeds. This chart would show 110 kilos of lift at under 7 kph, factoring in only the main wing. Drag numbers do not reflect the board, the mast, or the motor/propellor unit.
Obviously the variations are unlimited. The question becomes the desired speed in a hydrofoil to achieve a given amount of lift. 110 kilograms at 12 kph for example. Maybe we can have a discussion on the average speed to center the designs around? Lower aspect winger i.e. wider wings will provide more lift at low speed but more drag at higher speeds. Narrow wings, higher aspect, will achieve the required lift at a higher speed but will have less drag going fast. What speed is ideal to lift out of the water? What is an idea top speed?
If anyone can supply some existing wing measurements, such as overall width, chord width root and tip, chord thickness and a plan view photo, I can try to enter in the shape and see what the results are. As time permits.