Where it was sailed. Model yacht sailing grew up around the ornamental water of city parks — the tradition of sailing wooden pond yachts at the Jardin du Luxembourg in Paris dates from 1881, and London had model yacht clubs through the same period, with the sport becoming widely fashionable after the First World War. Racing was typically on long narrow ponds, and the number of times a boat had to be stopped and reset at the bank counted against you in the result. That rule is the reason self-steering was invented at all.

Weighted rudders first. The earliest steering gears were free-swinging rudders with a weight attached. When the boat heeled, the weight swung the rudder and pushed the boat back up toward the wind. Skippers carried a set of rudders with different weights and chose one to match the day's conditions — the boat was tuned by swapping hardware, before the race, with no adjustment afterwards.

Braine gear, 1904. George Braine, of the Kensington Gardens model yacht club in London, connected the rudder to the mainsheet: a quadrant on the rudder stock is driven by the tension in the sheet and damped with a rubber band, so as the sail swings under a gust the rudder moves to bring the boat back on course. It was used very widely on both racing and recreational boats, and it is a genuinely elegant piece of feedback engineering — the disturbance itself supplies the correction.

Vane gear, and after. Wind-vane steering, in which a vane senses the apparent wind angle and drives the rudder, followed later and is the ancestor of the self-steering gear used on full-size ocean-going yachts to this day. The line runs from a toy boat on a park pond to equipment that has carried people across oceans single-handed. Radio control eventually replaced free sailing in most clubs, but vintage classes still race the old way, with the boat solving the crossing alone.

Water Games

Blueprints (1)

Pond Yacht