Ship Pre-Design: Shipowner Considerations — Part I: Maneuverability in Restricted Waters, Quay Dynamics, and the Kinematics of Safe Mooring

This technical paper constitutes the first installment of a research triptych dedicated to the critical analysis of merchant ship pre-design conducted from the operational perspective of the Shipowner-Master Mariner, in direct contrast to uncritical catalog standards from commercial shipyards. Abstract: The pre-design and procurement of high-port-frequency merchant tonnage (Ro-Ro, Ro-Pax, PCTC, Con-Ro) are routinely compromised by shipyard business models oriented solely toward gross internal volume maximization or initial capital expenditure (CAPEX) compression. This approach systematically neglects the severe physical constraints of restricted waters, maneuvering ergonomics, and the hyperstatic mechanics of quay operations. This paper quantifies the cumulative "gray cost" resulting from deficiencies in autonomous maneuverability and formalizes the physics of Safe Mooring. The study analytically dismantles the common quantitative fallacy that deploying a higher number of mooring lines linearly increases holding safety. By analyzing dynamic elasticity differences and geometric line lengths, it is demonstrated that modulus disparities concentrate up to 90% of environmental parting forces onto a single line, triggering catastrophic cascading failures under cyclic surge and gust conditions. The work provides: Rigorous two-stage vector resolution equations (first vertical zenith angle degradation on low historic quays, followed by horizontal/longitudinal force breakdown); Parametric sizing models for transverse thrusters against light-draft windage area (incorporating anti-suction hull notches and minimum specific thrust thresholds of 12–14 kg/m²); Integrated deck ergonomics and crew safety architectures (winch-to-chock rectilinear alignment eliminating pedestal rollers, snap-back zone mitigation, and integrated below-deck stowage reels protecting synthetic fibers from UV degradation and salt crystallization); Hydrodynamic modeling of thruster jet impact against heritage stone quays, formally introducing a mobile suspended energy-dissipating shield with crossed relief lattices (generating localized stationary fluid vortices) and 45° lateral deflectors to eliminate downward toe scour. Triptych Roadmap: Part I (Present Work): Maneuverability in Restricted Waters, Quay Dynamics, and the Kinematics of Safe Mooring. Part II (Forthcoming): Dimensional Parametrization (LOA, Beam, Draft, Airdraft), Wetted Hydrodynamics, and Windage Aerodynamics in Partially Laden PCTCs. Part III (Forthcoming): The Friendly & Protective Ship Architecture: Crew Habitability, Maintenance Multipliers (1:10), and Intrinsic Structural Safety.