Design Blueprint: A Lake Thermal-Difference Engine for Titan: Power from the Temperature Gap Between Lake Liquid and Subsurface Sediment

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24203042): 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 Carnot efficiency ceiling of 0.0309, practical cycle efficiency of 0.013, heat drawn from the warm source of 7698 watts. 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 engine is a civilian power system for lake-shore science stations, working only on a natural temperature difference in the lake environment; it has no application beyond generating electricity for peaceful instruments. 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.