Design Blueprint: A Lake Ferry for Titan: Buoyancy, Hull Drag and Propulsion Energy for a Stated Crossing

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24203187): This study sizes the Titan surface system named in its title for operation in the Titan surface environment, and reports the result as SIMULATED, NOT MEASURED. The design is developed from stated physical relations and a shared environmental basis, and every performance figure is computed by the deposited script rather than asserted. Among the computed results are total displacement mass of 2,700 kilograms, payload capacity after fixed masses of 400 kilograms, hull drag at cruise speed of 136.8 newtons. Mass and power budgets are assembled from components so that they can be audited, off-design behaviour and materials uncertainty are discussed openly, and the limits of the sizing are stated in full. The ferry is a civilian transport vessel carrying personnel, instruments and cargo between lake-shore stations; it is a peaceful logistics craft with no application beyond moving people and peaceful goods across the lakes. Status: DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. All numbers are simulated values from the source paper's computation, deposited with this blueprint as compute.py and results.json. The design is a civilian science, mobility and power system for Titan surface operations and has no targeting or weapon application. AI-use disclosure: Dave, an AI research system, assisted with the computation and drafting under the author's direction; author of record William Alexander Aldred.