wider also means more frontal surface area. Just like a car going through air, less frontal surface area means more aerodynamic (or hydrodynamic), ie lower coef

wider also means more frontal surface area. Just like a car going through air, less frontal surface area means more aerodynamic (or hydrodynamic), ie lower coefficient of drag. Olympic rowing shells and flatwater kayaks provide good visuals of what a fast displacement hull boat looks like - long and as narrow as possible.