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I can be the Troubleshooting Lead

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Aman

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Some laquer or waterproof clearcoat can be sprayed on the hull body to reduce parasitic drag.

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The bow can be made to be sharp to cut throught the water, and the stern should be slightly rebated to avoid vortices and turbulence.

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Small pontoons can (potentially) be added on the two sides to stabillize the boat, but it could increase drag and cause instabilities when tilted.

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Re tells us if airflow/waterflow is laminar or turbulent. Useful for simulations and calculating lift.

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Major concerns for the hull: stability and drag

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Major concerns for the hull: stability and drag

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The primary way to achieve stability is to balance the force vectors from the sail and hull.

Summary:

The sail is an aerofoil. It produces two forces: a drag force parallel to the wind direction and proportional to: wind strength & angle of attack (which determines the surface area exposed to the wind and thus the drag force) and a lift force perpendicular to the chord line of the sail.

The hull produces a drag force parallel to the direction of motion and proportional to surface area exposed to water in that direction (thus why the hull must be pointed towards the direction of movement) and a lift force perpendicular to the direction of motion which opposes the leeward movement of the wind (undesirable component of the sails' lift)

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The kinematic viscosity of a fluid can help to estimate the reynolds number. The v of Air at 30 degrees is 1.5x10^-5 m/s

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Possible choices:

Balsa wood

Decent strength and lightweight

Very susceptible to water damage

Carbon Fiber

Strong, waterproof and very light

Expensive and dangerous to work with

Fiberglass

Smooth and lightweight, also waterproof

Expensive and can irritate skin. Requires epoxy

3D Printing

Adaptable, cheap, very easy to work with

Not watertight, needs to be re-finished

Mylar

Very lightweight and works well in airfoils

Somewhat expensive and very fragile

Sheet Metal

Tough and cheap

Heavy and difficult to manufacture without tools

Acrylic

Cheap, can be laser cut

Heavy and not flexible

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Carbon fiber seems extremely expensive based on a cursory search (as already stated), but might work if parts aren't custom. Definitely not something to use in the prototyping stage. I struggle to see a use case for sheet metal, except potentially as a hull material if used in a single sheet, but as stated already, very difficult to work with. My guess is balsa + 3d printing will be the bulk of the boat, potentially with fiberglass or carbon fiber if we can find off the shelf parts. I wasn't able to find much information on shaping/working with mylar, but the costs do seem acceptable

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Most NACA airfoils like 4412 are designed for reynolds numbers of abve 200,000. In our boat, the reynolds number is less than 60,000. Therefoil, the 4412 would be insanely inefficient at low speeds.

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The center of the keel can be extruded down to create a board that sticks out. This helps reduce side slip, acting as a vertical stabilizer.

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The center of lift of an airfoil is approximately a quarter way down the chord line. This point should be inline with the center of mass to prevent unwanted turning.

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Will be made from wood

Barge-style

Flat sides, no camber

Will use a laser cutter