<P> Small boat rudders that can be steered more or less perpendicular to the hull's longitudinal axis make effective brakes when pushed "hard over ." However, terms such as "hard over," "hard to starboard," etc. signify a maximum - rate turn for larger vessels . Transom hung rudders or far aft mounted fin rudders generate greater moment and faster turning than more forward mounted keel hung rudders . </P> <P> There is also the barrel type rudder, where the ship's screw is enclosed and can be swiveled to steer the vessel . Designers claim that this type of rudder on a smaller vessel will answer the helm faster . </P> <P> On an aircraft, the rudder is a directional control surface along with the rudder - like elevator (usually attached to the horizontal tail structure, if not a slab elevator) and ailerons (attached to the wings) that control pitch and roll, respectively . The rudder is usually attached to the fin (or vertical stabilizer), which allows the pilot to control yaw about the vertical axis, i.e., change the horizontal direction in which the nose is pointing . The rudder's direction in aircraft since the "Golden Age" of flight between the two World Wars into the 21st century has been manipulated with the movement of a pair of counter-moving foot pedals by the pilot, while during the pre-1919 era rudder control was most often operated with by a center - pivoted, solid "rudder bar" which usually had pedal and / or stirrup - like hardware on its ends to allow the pilot's feet to stay close to the ends of the bar's rear surface . </P> <P> In practice, both aileron and rudder control input are used together to turn an aircraft, with the ailerons imparting roll and the rudder imparting yaw and also compensating for a phenomenon called adverse yaw . A rudder alone will turn a conventional fixed - wing aircraft, but much more slowly than if ailerons are also used in conjunction . Use of rudder and ailerons together produces coordinated turns, in which the longitudinal axis of the aircraft is in line with the arc of the turn, neither slipping (under - ruddered), nor skidding (over-ruddered). Improperly ruddered (uncoordinated) turns at low speed can precipitate a spin which can be dangerous at low altitudes . </P>

Where is the rudder located on a plane
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