Abstract: A sail boat boom control system provides braking forces for restraining movement of the boom during down wind sailing or sailing with a quartering breeze. The system comprises a boom restrainer loop attached to the boom and resiliently tensioned, pivotally mounted friction device which is adjustable to apply friction forces restraining movement of the boom loop, thereby providing the braking force on the boom. The friction device is adjustably controlled by a control line extending to a position where it is easily operated by the helmsman or other crew. A quick-release device releases the control line when required to allow the friction device to move to a position in which the boom is free from restraint. Deck-mounted and mast-mounted friction control devices are disclosed.

Abstract: A rudder control system for a boat rudder comprises a rudder control line extending from the tiller to guide spools displaced from the center line of the hull. The ends of the control line are joined by a resilient section which may take the form of a coil spring or resilient cord. Stop means affixed to the control line and the boat hull resiliently return the rudder to the center position. Adjustment of the tension in the cord provides for resistance to turning movement of the rudder.