Based on E. V. Lewis (ed.) — Principles of Naval Architecture (SNAME). The three chapters that fall on the pilot exam — Resistance, Propulsion and Controllability — become live benches: drag the sliders and watch the resistance curve build its humps, the propeller's open-water curves shift, the turning circle tighten, the stability well flip from bowl to hilltop. The point of a coefficient is felt, not recited. Tap the Brazil flag inside a chapter for the Portuguese translation.