In the Sea there are Waves, I know it is almost impossible to believe but I assure you that in the Sea there are Waves, waves that are big in relation to a small sailboat (which is what this thread is about) and the oceans are crossed downwind, and that is what this thread is about: small sailboats with Oceanic pretensions and that hoist 15-10 and 0, zero, square meters of Sail per Ton.
And those little sailboats are driven by Wind Force and/or Earth Force (= Displacement x sine of the Angle of the Wave slope).