- Since the very beginning, the general concept of the boat
has been changed many times (look at the Boat's story). The different
choices made in the boat's concept are easy to
understand. So to go fast, you have to:
**Decrease the drag.****Find enough power to reach high speed.****The boat must be stable enough to become pilotable.**

- The drag reduction can be quantitatively (you use
special shapes,..) or qualitatively (you change
the method) reduced. To break the world sailing
speed record, we choose the second approach. We
wanted to make a qualitatif jump instead of only
a quantitatif one. So, to reach high speed, our
first idea was to lift the machine with foils
like Hydroptere
and Vecteur vitesse.
But, at high speed, foils are not efficient
enough due to the cavitation or
due to the ventilation.
So the boat will be kept out of the water at high
speed with an aerodynamic
lift coming from a wing (yes, like a plane
!!).

- The simpliest way to go fast is to increase the
power. But in our case, this power is limited due
to the roll momentum admitted by the boat. To
increase this limit, several ideas were proposed.
At the present time, we choose to use two tilted
sails to decrease up to 25% the roll momentum
(also called the heeling momemtum) at a specific
power (check our first
calculations).

- The stability of the machine is obviously a
serious problem. Forces are multiple and have
variable intensities. Moreover, you need a stable
boat but also a pilotable one. To solve this
problem, INNOVOILE is working on a
**3D Dynamic Simulator, the SDT**.

Because a boat is naturally unstable due to the forces's repartition (the propulsion force is placed over the gravity centre of the boat), we use a**Constant Lift Wing (APC) also called a freewing**. Moreover; since the proximity of the free surface, this freewing will benefit from Grounf effect (as a WIG vehicles)

To summarize, here are our technical innovations:

**The two tilted solid wingsails.**

**The aerodynamic lift at high speed (of course foils at mid-speed).**

**The Constant Lift wing (APC) for the stability.**

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