overcome the influence of the wind. The weighted rudder is almost universal in the British Isles. Weights are also incorporated into the other, following methods. Main sheet balance method The preferred method in the United States uses the main-sheet balance gear, in which the boom is connected with the tiller in such a manner that, when it swings out with a pressure of wind, the rudder is automatically pulled round sufficiently to keep the yacht in its course. This will usually involve some sort of return spring so that the mechanism is responsive to the wind. This apparatus is particularly efficient in sailing before the wind. More modern, computer-based RC transmitters often have mixing circuitry integral to their design, that can "mix" the sheet-balancing, operated with a sail control servo, internally in the transmitter's computerized encoder unit, with the rudder control. Wind vane method A more accurate method is to use a separate rudder vane; this is made from a plank of light wood such as balsa. The vane is operated in two principal positions, one for upwind sailing, the other for downwind. While some modelers object that the model craft will not be a plausible representation of its full-sized prototype, real long-distance cruising boats are frequently steered with dedicated windvanes of varying complexity (mechanical or electronic), occasionally with a line attached to a sheet, and never using weighted rudders. Radio control Radio control may be used in many locations. Typically two controls are provided for sailing yacht models, a general–purpose small servo for rudder control and a specialized sail winch to draw in the mainsheet and jib. Motorized craft control rudder and throttle, and perhaps other functions such as reversing, lighting, and mechanical novelties. Other radio controlled watercraft hobbies include the operation and battle engagement of scale model warships (with gas-operated guns intended to sink opponents), and various high speed racing craft driven by powerful engines. Regattas Model yacht basin regattas These occur within a specialized pond or rectangular pool, in which a pole–person will walk down each side of the basin carrying a pole, prepared to push the yachts into an opposite tack before collision with the edge. The operators will usually work one side and a single turner, called a "Liverpool boy" will work the opposite side. In some locations the yachts are adjusted so that they will change tack at some point and so allowing the