Sailboat Auto Tiller Blue Water Attachment Mechanical Great Circle Calculations

Abstract

# Technical Disclosure: Clockwork Mechanical Great Circle Auto-Tiller Corrector for Blue Water Vessels **Author:** [Your Name / Autonomous Research] **Date of Publication:** August 6, 2026 **License:** Creative Commons Attribution 4.0 International (CC-BY 4.0) **Keywords:** Nautical Engineering, Mechanical Computing, Great Circle Navigation, Auto-Tiller, Prior Art, Defensive Publication --- ## Abstract This document establishes defensive prior art for a purely mechanical, non-electronic navigation and steering control apparatus designed for small to mid-sized sailing vessels. The device utilizes a spring-driven clockwork escapement, a differential mechanical integrator, and spherical trigonometry gear trains to continuously calculate and adjust a vessel's target heading along a Great Circle trajectory. Designed as a dual-use unit, the apparatus functions as a precision desktop horological display while possessing quick-release mechanical interfaces for direct mounting to a vessel’s bridge deck and integration with pendulum-servo windvane steering systems. --- ## 1. System Overview & Architecture Unlike modern digital autopilots or traditional mechanical windvanes that maintain a fixed relative apparent wind or rhumb-line heading, the **Mechanical Blue Water Tiller Corrector** calculates the dynamic change in course ($dC$) required to maintain an optimal Great Circle route over extended oceanic transits. The mechanism operates as a low-torque "master programmer." Rather than exerting direct physical force against the vessel's primary tiller or rudder, the output of the mechanical computer dynamically rotates the air-vane target ring of an auxiliary pendulum-servo system. The hydrodynamic energy of the water passing over the submerged servo blade provides the force necessary to move the helm. --- ## 2. Mechanical Components & Kinematic Chain ### 2.1 Power & Temporal Baseline Input - **Constant-Force Escapement:** A spring-wound, high-precision clockwork movement providing a regulated rotational speed to serve as the baseline time standard. - **Manual Parameter Setting Rings:** Co-axial, silvered-brass input dials allowing manual configuration of: 1. Initial Latitude ($\varphi$) and Longitude ($\lambda$). 2. Target Speed Over Ground (SOG) in knots for dead-reckoning integration. ### 2.2 Mechanical Differential & Spherical Trigonometry Integrator - **Differential Assembly:** Merges time-elapsed data from the escapement with the pre-set SOG rate. - **Geared Spherical Analog Assembly:** An arrangement of differential sun-and-planet gears, cams, and bevel drives that approximates the rate of change of initial course ($dC/dt$) derived from the spherical law of cosines ($\cos a = \cos b \cos c + \sin b \sin c \cos A$). ### 2.3 Output Linkage & Telemetry Interface - **Output Control Gimbal:** Rotates an external output shaft proportional to $dC$. - **Quick-Release Deck Coupler:** A weighted mahogany desktop gimbal stand with a keyed, spring-loaded mounting plate designed to attach to a low-profile bridge deck pad. - **Steering Coupling:** A fine brass chain or push-rod linking the output shaft directly to the counterbalanced air-vane head of a pendulum-servo windvane (e.g., Hasler or Fleming style). --- ## 3. Operational Mechanics & Sequence 1. **Calibration:** The operator sets departure coordinates, destination vectors, and estimated average speed via the perimeter setting rings. 2. **Engagement:** The unit is transferred from its office mounting base to the bridge deck plate and connected via push-rod to the windvane head. 3. **Execution:** As time elapses, the internal gear train continuously nudges the windvane’s apparent wind angle, causing the vessel to follow a Great Circle arc without reliance on electrical power, GPS, or microprocessors. 4. **Manual Override:** A knurled clutch allows instantaneous disengagement to reset position, account for drift, or revert to standard windvane operation. --- ## 4. Prior Art & Claim Boundaries This disclosure explicitly places into the public domain all mechanical configurations combining: 1. A clockwork/spring-driven escapement coupled with mechanical differential gears for the continuous calculation of Great Circle spherical navigation headings. 2. The mechanical coupling of an analog, non-electronic spherical route calculator to the command input of a hydrodynamic/aerodynamic pendulum-servo windvane steering apparatus. 3. A modular, dual-purpose housing operating as both a gimbaled horological desktop display and a de tachable marine-grade mechanical autopilot interface.