PROBLEMS we have to solve:

Two different fluids (water and air) :

• Free surface.
  
• Interaction between these two fluids.
  
• Ground effect at high speed.
  

When the boat is in contact with the air, we have to :

• Solve the aerodynamic problems.
• Manage the passive parts (hulls at high speed).
• Manage the wind fluctuations.

When the boat is in contact with the water, we have to :

• Solve the hydrodynamic problems.
• The ventilation and cavitation that appear at high speed.

Extend the stability notion to a pilotability one.

Solve the Structural Mechanics problems.

• Dimension of the boat (sails, beams,...)
• Choice of Materials (weight, optimal material strength)...

The communication part
The juridical aspects (contracts)